Metadata-Version: 2.1
Name: pydantic
Version: 2.4.2
Summary: Data validation using Python type hints
Project-URL: Homepage, https://github.com/pydantic/pydantic
Project-URL: Documentation, https://docs.pydantic.dev
Project-URL: Funding, https://github.com/sponsors/samuelcolvin
Project-URL: Source, https://github.com/pydantic/pydantic
Project-URL: Changelog, https://docs.pydantic.dev/latest/changelog/
Author-email: Samuel Colvin <s@muelcolvin.com>, Eric Jolibois <em.jolibois@gmail.com>, Hasan Ramezani <hasan.r67@gmail.com>, Adrian Garcia Badaracco <1755071+adriangb@users.noreply.github.com>, Terrence Dorsey <terry@pydantic.dev>, David Montague <david@pydantic.dev>
License-Expression: MIT
License-File: LICENSE
Classifier: Development Status :: 5 - Production/Stable
Classifier: Environment :: Console
Classifier: Environment :: MacOS X
Classifier: Framework :: Hypothesis
Classifier: Framework :: Pydantic
Classifier: Intended Audience :: Developers
Classifier: Intended Audience :: Information Technology
Classifier: Intended Audience :: System Administrators
Classifier: License :: OSI Approved :: MIT License
Classifier: Operating System :: POSIX :: Linux
Classifier: Operating System :: Unix
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3 :: Only
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Programming Language :: Python :: 3.10
Classifier: Programming Language :: Python :: 3.11
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Programming Language :: Python :: Implementation :: PyPy
Classifier: Topic :: Internet
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Requires-Python: >=3.7
Requires-Dist: annotated-types>=0.4.0
Requires-Dist: pydantic-core==2.10.1
Requires-Dist: typing-extensions>=4.6.1
Provides-Extra: email
Requires-Dist: email-validator>=2.0.0; extra == 'email'
Description-Content-Type: text/markdown

# Pydantic

[![CI](https://github.com/pydantic/pydantic/workflows/CI/badge.svg?event=push)](https://github.com/pydantic/pydantic/actions?query=event%3Apush+branch%3Amain+workflow%3ACI)
[![Coverage](https://coverage-badge.samuelcolvin.workers.dev/pydantic/pydantic.svg)](https://coverage-badge.samuelcolvin.workers.dev/redirect/pydantic/pydantic)
[![pypi](https://img.shields.io/pypi/v/pydantic.svg)](https://pypi.python.org/pypi/pydantic)
[![CondaForge](https://img.shields.io/conda/v/conda-forge/pydantic.svg)](https://anaconda.org/conda-forge/pydantic)
[![downloads](https://static.pepy.tech/badge/pydantic/month)](https://pepy.tech/project/pydantic)
[![versions](https://img.shields.io/pypi/pyversions/pydantic.svg)](https://github.com/pydantic/pydantic)
[![license](https://img.shields.io/github/license/pydantic/pydantic.svg)](https://github.com/pydantic/pydantic/blob/main/LICENSE)
[![Pydantic v2](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/pydantic/pydantic/main/docs/badge/v2.json)](https://docs.pydantic.dev/latest/contributing/#badges)

Data validation using Python type hints.

Fast and extensible, Pydantic plays nicely with your linters/IDE/brain.
Define how data should be in pure, canonical Python 3.7+; validate it with Pydantic.

## Pydantic Company :rocket:

We've started a company based on the principles that I believe have led to Pydantic's success.
Learning more from the [Company Announcement](https://pydantic.dev/announcement/).

## Pydantic V1.10 vs. V2

Pydantic V2 is a ground-up rewrite that offers many new features, performance improvements, and some breaking changes compared to Pydantic V1.

If you're using Pydantic V1 you may want to look at the
[pydantic V1.10 Documentation](https://docs.pydantic.dev/) or,
[`1.10.X-fixes` git branch](https://github.com/pydantic/pydantic/tree/1.10.X-fixes). Pydantic V2 also ships with the latest version of Pydantic V1 built in so that you can incrementally upgrade your code base and projects: `from pydantic import v1 as pydantic_v1`.

## Help

See [documentation](https://docs.pydantic.dev/) for more details.

## Installation

Install using `pip install -U pydantic` or `conda install pydantic -c conda-forge`.
For more installation options to make Pydantic even faster,
see the [Install](https://docs.pydantic.dev/install/) section in the documentation.

## A Simple Example

```py
from datetime import datetime
from typing import List, Optional
from pydantic import BaseModel

class User(BaseModel):
    id: int
    name: str = 'John Doe'
    signup_ts: Optional[datetime] = None
    friends: List[int] = []

external_data = {'id': '123', 'signup_ts': '2017-06-01 12:22', 'friends': [1, '2', b'3']}
user = User(**external_data)
print(user)
#> User id=123 name='John Doe' signup_ts=datetime.datetime(2017, 6, 1, 12, 22) friends=[1, 2, 3]
print(user.id)
#> 123
```

## Contributing

For guidance on setting up a development environment and how to make a
contribution to Pydantic, see
[Contributing to Pydantic](https://docs.pydantic.dev/contributing/).

## Reporting a Security Vulnerability

See our [security policy](https://github.com/pydantic/pydantic/security/policy).

## Changelog

## v2.4.2 (2023-09-27)

[GitHub release](https://github.com/pydantic/pydantic/releases/tag/v2.4.2)

### What's Changed

#### Fixes

* Fix bug with JSON schema for sequence of discriminated union by [@dmontagu](https://github.com/dmontagu) in [#7647](https://github.com/pydantic/pydantic/pull/7647)
* Fix schema references in discriminated unions by [@adriangb](https://github.com/adriangb) in [#7646](https://github.com/pydantic/pydantic/pull/7646)
* Fix json schema generation for recursive models by [@adriangb](https://github.com/adriangb) in [#7653](https://github.com/pydantic/pydantic/pull/7653)
* Fix `models_json_schema` for generic models by [@adriangb](https://github.com/adriangb) in [#7654](https://github.com/pydantic/pydantic/pull/7654)
* Fix xfailed test for generic model signatures by [@adriangb](https://github.com/adriangb) in [#7658](https://github.com/pydantic/pydantic/pull/7658)

### New Contributors

* [@austinorr](https://github.com/austinorr) made their first contribution in [#7657](https://github.com/pydantic/pydantic/pull/7657)
* [@peterHoburg](https://github.com/peterHoburg) made their first contribution in [#7670](https://github.com/pydantic/pydantic/pull/7670)

## v2.4.1 (2023-09-26)

[GitHub release](https://github.com/pydantic/pydantic/releases/tag/v2.4.1)

### What's Changed

#### Packaging

* Update pydantic-core to 2.10.1 by [@davidhewitt](https://github.com/davidhewitt) in [#7633](https://github.com/pydantic/pydantic/pull/7633)

#### Fixes

* Serialize unsubstituted type vars as `Any` by [@adriangb](https://github.com/adriangb) in [#7606](https://github.com/pydantic/pydantic/pull/7606)
* Remove schema building caches by [@adriangb](https://github.com/adriangb) in [#7624](https://github.com/pydantic/pydantic/pull/7624)
* Fix an issue where JSON schema extras weren't JSON encoded by [@dmontagu](https://github.com/dmontagu) in [#7625](https://github.com/pydantic/pydantic/pull/7625)

## v2.4.0 (2023-09-22)

[GitHub release](https://github.com/pydantic/pydantic/releases/tag/v2.4.0)

### What's Changed

#### Packaging

* Update pydantic-core to 2.10.0 by [@samuelcolvin](https://github.com/samuelcolvin) in [#7542](https://github.com/pydantic/pydantic/pull/7542)

#### New Features

* Add `Base64Url` types by [@dmontagu](https://github.com/dmontagu) in [#7286](https://github.com/pydantic/pydantic/pull/7286)
* Implement optional `number` to `str` coercion by [@lig](https://github.com/lig) in [#7508](https://github.com/pydantic/pydantic/pull/7508)
* Allow access to `field_name` and `data` in all validators if there is data and a field name by [@samuelcolvin](https://github.com/samuelcolvin) in [#7542](https://github.com/pydantic/pydantic/pull/7542)
* Add `BaseModel.model_validate_strings` and `TypeAdapter.validate_strings` by [@hramezani](https://github.com/hramezani) in [#7552](https://github.com/pydantic/pydantic/pull/7552)
* Add Pydantic `plugins` experimental implementation by [@lig](https://github.com/lig) [@samuelcolvin](https://github.com/samuelcolvin) and [@Kludex](https://github.com/Kludex) in [#6820](https://github.com/pydantic/pydantic/pull/6820)

#### Changes

* Do not override `model_post_init` in subclass with private attrs by [@Viicos](https://github.com/Viicos) in [#7302](https://github.com/pydantic/pydantic/pull/7302)
* Make fields with defaults not required in the serialization schema by default by [@dmontagu](https://github.com/dmontagu) in [#7275](https://github.com/pydantic/pydantic/pull/7275)
* Mark `Extra` as deprecated by [@disrupted](https://github.com/disrupted) in [#7299](https://github.com/pydantic/pydantic/pull/7299)
* Make `EncodedStr` a dataclass by [@Kludex](https://github.com/Kludex) in [#7396](https://github.com/pydantic/pydantic/pull/7396)
* Move `annotated_handlers` to be public by [@samuelcolvin](https://github.com/samuelcolvin) in [#7569](https://github.com/pydantic/pydantic/pull/7569)

#### Performance

* Simplify flattening and inlining of `CoreSchema` by [@adriangb](https://github.com/adriangb) in [#7523](https://github.com/pydantic/pydantic/pull/7523)
* Remove unused copies in `CoreSchema` walking by [@adriangb](https://github.com/adriangb) in [#7528](https://github.com/pydantic/pydantic/pull/7528)
* Add caches for collecting definitions and invalid schemas from a CoreSchema by [@adriangb](https://github.com/adriangb) in [#7527](https://github.com/pydantic/pydantic/pull/7527)
* Eagerly resolve discriminated unions and cache cases where we can't by [@adriangb](https://github.com/adriangb) in [#7529](https://github.com/pydantic/pydantic/pull/7529)
* Replace `dict.get` and `dict.setdefault` with more verbose versions in `CoreSchema` building hot paths by [@adriangb](https://github.com/adriangb) in [#7536](https://github.com/pydantic/pydantic/pull/7536)
* Cache invalid `CoreSchema` discovery by [@adriangb](https://github.com/adriangb) in [#7535](https://github.com/pydantic/pydantic/pull/7535)
* Allow disabling `CoreSchema` validation for faster startup times by [@adriangb](https://github.com/adriangb) in [#7565](https://github.com/pydantic/pydantic/pull/7565)

#### Fixes

* Fix config detection for `TypedDict` from grandparent classes by [@dmontagu](https://github.com/dmontagu) in [#7272](https://github.com/pydantic/pydantic/pull/7272)
* Fix hash function generation for frozen models with unusual MRO by [@dmontagu](https://github.com/dmontagu) in [#7274](https://github.com/pydantic/pydantic/pull/7274)
* Make `strict` config overridable in field for Path by [@hramezani](https://github.com/hramezani) in [#7281](https://github.com/pydantic/pydantic/pull/7281)
* Use `ser_json_<timedelta|bytes>` on default in `GenerateJsonSchema` by [@Kludex](https://github.com/Kludex) in [#7269](https://github.com/pydantic/pydantic/pull/7269)
* Adding a check that alias is validated as an identifier for Python by [@andree0](https://github.com/andree0) in [#7319](https://github.com/pydantic/pydantic/pull/7319)
* Raise an error when computed field overrides field by [@sydney-runkle](https://github.com/sydney-runkle) in [#7346](https://github.com/pydantic/pydantic/pull/7346)
* Fix applying `SkipValidation` to referenced schemas by [@adriangb](https://github.com/adriangb) in [#7381](https://github.com/pydantic/pydantic/pull/7381)
* Enforce behavior of private attributes having double leading underscore by [@lig](https://github.com/lig) in [#7265](https://github.com/pydantic/pydantic/pull/7265)
* Standardize `__get_pydantic_core_schema__` signature by [@hramezani](https://github.com/hramezani) in [#7415](https://github.com/pydantic/pydantic/pull/7415)
* Fix generic dataclass fields mutation bug (when using `TypeAdapter`) by [@sydney-runkle](https://github.com/sydney-runkle) in [#7435](https://github.com/pydantic/pydantic/pull/7435)
* Fix `TypeError` on `model_validator` in `wrap` mode by [@pmmmwh](https://github.com/pmmmwh) in [#7496](https://github.com/pydantic/pydantic/pull/7496)
* Improve enum error message by [@hramezani](https://github.com/hramezani) in [#7506](https://github.com/pydantic/pydantic/pull/7506)
* Make `repr` work for instances that failed initialization when handling `ValidationError`s by [@dmontagu](https://github.com/dmontagu) in [#7439](https://github.com/pydantic/pydantic/pull/7439)
* Fixed a regular expression denial of service issue by limiting whitespaces by [@prodigysml](https://github.com/prodigysml) in [#7360](https://github.com/pydantic/pydantic/pull/7360)
* Fix handling of `UUID` values having `UUID.version=None` by [@lig](https://github.com/lig) in [#7566](https://github.com/pydantic/pydantic/pull/7566)
* Fix `__iter__` returning private `cached_property` info by [@sydney-runkle](https://github.com/sydney-runkle) in [#7570](https://github.com/pydantic/pydantic/pull/7570)
* Improvements to version info message by [@samuelcolvin](https://github.com/samuelcolvin) in [#7594](https://github.com/pydantic/pydantic/pull/7594)

### New Contributors
* [@15498th](https://github.com/15498th) made their first contribution in [#7238](https://github.com/pydantic/pydantic/pull/7238)
* [@GabrielCappelli](https://github.com/GabrielCappelli) made their first contribution in [#7213](https://github.com/pydantic/pydantic/pull/7213)
* [@tobni](https://github.com/tobni) made their first contribution in [#7184](https://github.com/pydantic/pydantic/pull/7184)
* [@redruin1](https://github.com/redruin1) made their first contribution in [#7282](https://github.com/pydantic/pydantic/pull/7282)
* [@FacerAin](https://github.com/FacerAin) made their first contribution in [#7288](https://github.com/pydantic/pydantic/pull/7288)
* [@acdha](https://github.com/acdha) made their first contribution in [#7297](https://github.com/pydantic/pydantic/pull/7297)
* [@andree0](https://github.com/andree0) made their first contribution in [#7319](https://github.com/pydantic/pydantic/pull/7319)
* [@gordonhart](https://github.com/gordonhart) made their first contribution in [#7375](https://github.com/pydantic/pydantic/pull/7375)
* [@pmmmwh](https://github.com/pmmmwh) made their first contribution in [#7496](https://github.com/pydantic/pydantic/pull/7496)
* [@disrupted](https://github.com/disrupted) made their first contribution in [#7299](https://github.com/pydantic/pydantic/pull/7299)
* [@prodigysml](https://github.com/prodigysml) made their first contribution in [#7360](https://github.com/pydantic/pydantic/pull/7360)

## v2.3.0 (2023-08-23)

[GitHub release](https://github.com/pydantic/pydantic/releases/tag/v2.3.0)

* 🔥 Remove orphaned changes file from repo by [@lig](https://github.com/lig) in [#7168](https://github.com/pydantic/pydantic/pull/7168)
* Add copy button on documentation by [@Kludex](https://github.com/Kludex) in [#7190](https://github.com/pydantic/pydantic/pull/7190)
* Fix docs on JSON type by [@Kludex](https://github.com/Kludex) in [#7189](https://github.com/pydantic/pydantic/pull/7189)
* Update mypy 1.5.0 to 1.5.1 in CI by [@hramezani](https://github.com/hramezani) in [#7191](https://github.com/pydantic/pydantic/pull/7191)
* fix download links badge by [@samuelcolvin](https://github.com/samuelcolvin) in [#7200](https://github.com/pydantic/pydantic/pull/7200)
* add 2.2.1 to changelog by [@samuelcolvin](https://github.com/samuelcolvin) in [#7212](https://github.com/pydantic/pydantic/pull/7212)
* Make ModelWrapValidator protocols generic by [@dmontagu](https://github.com/dmontagu) in [#7154](https://github.com/pydantic/pydantic/pull/7154)
* Correct `Field(..., exclude: bool)` docs by [@samuelcolvin](https://github.com/samuelcolvin) in [#7214](https://github.com/pydantic/pydantic/pull/7214)
* Make shadowing attributes a warning instead of an error by [@adriangb](https://github.com/adriangb) in [#7193](https://github.com/pydantic/pydantic/pull/7193)
* Document `Base64Str` and `Base64Bytes` by [@Kludex](https://github.com/Kludex) in [#7192](https://github.com/pydantic/pydantic/pull/7192)
* Fix `config.defer_build` for serialization first cases by [@samuelcolvin](https://github.com/samuelcolvin) in [#7024](https://github.com/pydantic/pydantic/pull/7024)
* clean Model docstrings in JSON Schema by [@samuelcolvin](https://github.com/samuelcolvin) in [#7210](https://github.com/pydantic/pydantic/pull/7210)
* fix [#7228](https://github.com/pydantic/pydantic/pull/7228) (typo): docs in `validators.md` to correct `validate_default` kwarg by [@lmmx](https://github.com/lmmx) in [#7229](https://github.com/pydantic/pydantic/pull/7229)
* ✅ Implement `tzinfo.fromutc` method for `TzInfo` in `pydantic-core` by [@lig](https://github.com/lig) in [#7019](https://github.com/pydantic/pydantic/pull/7019)
* Support `__get_validators__` by [@hramezani](https://github.com/hramezani) in [#7197](https://github.com/pydantic/pydantic/pull/7197)

## v2.2.1 (2023-08-18)

[GitHub release](https://github.com/pydantic/pydantic/releases/tag/v2.2.1)

* Make `xfail`ing test for root model extra stop `xfail`ing by [@dmontagu](https://github.com/dmontagu) in [#6937](https://github.com/pydantic/pydantic/pull/6937)
* Optimize recursion detection by stopping on the second visit for the same object by [@mciucu](https://github.com/mciucu) in [#7160](https://github.com/pydantic/pydantic/pull/7160)
* fix link in docs by [@tlambert03](https://github.com/tlambert03) in [#7166](https://github.com/pydantic/pydantic/pull/7166)
* Replace MiMalloc w/ default allocator by [@adriangb](https://github.com/adriangb) in [pydantic/pydantic-core#900](https://github.com/pydantic/pydantic-core/pull/900)
* Bump pydantic-core to 2.6.1 and prepare 2.2.1 release by [@adriangb](https://github.com/adriangb) in [#7176](https://github.com/pydantic/pydantic/pull/7176)

## v2.2.0 (2023-08-17)

[GitHub release](https://github.com/pydantic/pydantic/releases/tag/v2.2.0)

* Split "pipx install" setup command into two commands on the documentation site by [@nomadmtb](https://github.com/nomadmtb) in [#6869](https://github.com/pydantic/pydantic/pull/6869)
* Deprecate `Field.include` by [@hramezani](https://github.com/hramezani) in [#6852](https://github.com/pydantic/pydantic/pull/6852)
* Fix typo in default factory error msg by [@hramezani](https://github.com/hramezani) in [#6880](https://github.com/pydantic/pydantic/pull/6880)
* Simplify handling of typing.Annotated in GenerateSchema by [@dmontagu](https://github.com/dmontagu) in [#6887](https://github.com/pydantic/pydantic/pull/6887)
* Re-enable fastapi tests in CI by [@dmontagu](https://github.com/dmontagu) in [#6883](https://github.com/pydantic/pydantic/pull/6883)
* Make it harder to hit collisions with json schema defrefs by [@dmontagu](https://github.com/dmontagu) in [#6566](https://github.com/pydantic/pydantic/pull/6566)
* Cleaner error for invalid input to `Path` fields by [@samuelcolvin](https://github.com/samuelcolvin) in [#6903](https://github.com/pydantic/pydantic/pull/6903)
* :memo: support Coordinate Type by [@yezz123](https://github.com/yezz123) in [#6906](https://github.com/pydantic/pydantic/pull/6906)
* Fix `ForwardRef` wrapper for py 3.10.0 (shim until bpo-45166) by [@randomir](https://github.com/randomir) in [#6919](https://github.com/pydantic/pydantic/pull/6919)
* Fix misbehavior related to copying of RootModel by [@dmontagu](https://github.com/dmontagu) in [#6918](https://github.com/pydantic/pydantic/pull/6918)
* Fix issue with recursion error caused by ParamSpec by [@dmontagu](https://github.com/dmontagu) in [#6923](https://github.com/pydantic/pydantic/pull/6923)
* Add section about Constrained classes to the Migration Guide by [@Kludex](https://github.com/Kludex) in [#6924](https://github.com/pydantic/pydantic/pull/6924)
* Use `main` branch for badge links by [@Viicos](https://github.com/Viicos) in [#6925](https://github.com/pydantic/pydantic/pull/6925)
* Add test for v1/v2 Annotated discrepancy by [@carlbordum](https://github.com/carlbordum) in [#6926](https://github.com/pydantic/pydantic/pull/6926)
* Make the v1 mypy plugin work with both v1 and v2 by [@dmontagu](https://github.com/dmontagu) in [#6921](https://github.com/pydantic/pydantic/pull/6921)
* Fix issue where generic models couldn't be parametrized with BaseModel by [@dmontagu](https://github.com/dmontagu) in [#6933](https://github.com/pydantic/pydantic/pull/6933)
* Remove xfail for discriminated union with alias by [@dmontagu](https://github.com/dmontagu) in [#6938](https://github.com/pydantic/pydantic/pull/6938)
* add field_serializer to computed_field by [@andresliszt](https://github.com/andresliszt) in [#6965](https://github.com/pydantic/pydantic/pull/6965)
* Use union_schema with Type[Union[...]] by [@JeanArhancet](https://github.com/JeanArhancet) in [#6952](https://github.com/pydantic/pydantic/pull/6952)
* Fix inherited typeddict attributes / config by [@adriangb](https://github.com/adriangb) in [#6981](https://github.com/pydantic/pydantic/pull/6981)
* fix dataclass annotated before validator called twice by [@davidhewitt](https://github.com/davidhewitt) in [#6998](https://github.com/pydantic/pydantic/pull/6998)
* Update test-fastapi deselected tests by [@hramezani](https://github.com/hramezani) in [#7014](https://github.com/pydantic/pydantic/pull/7014)
* Fix validator doc format by [@hramezani](https://github.com/hramezani) in [#7015](https://github.com/pydantic/pydantic/pull/7015)
* Fix typo in docstring of model_json_schema by [@AdamVinch-Federated](https://github.com/AdamVinch-Federated) in [#7032](https://github.com/pydantic/pydantic/pull/7032)
* remove unused "type ignores" with pyright by [@samuelcolvin](https://github.com/samuelcolvin) in [#7026](https://github.com/pydantic/pydantic/pull/7026)
* Add benchmark representing FastAPI startup time by [@adriangb](https://github.com/adriangb) in [#7030](https://github.com/pydantic/pydantic/pull/7030)
* Fix json_encoders for Enum subclasses by [@adriangb](https://github.com/adriangb) in [#7029](https://github.com/pydantic/pydantic/pull/7029)
* Update docstring of `ser_json_bytes` regarding base64 encoding by [@Viicos](https://github.com/Viicos) in [#7052](https://github.com/pydantic/pydantic/pull/7052)
* Allow `@validate_call` to work on async methods by [@adriangb](https://github.com/adriangb) in [#7046](https://github.com/pydantic/pydantic/pull/7046)
* Fix: mypy error with `Settings` and `SettingsConfigDict` by [@JeanArhancet](https://github.com/JeanArhancet) in [#7002](https://github.com/pydantic/pydantic/pull/7002)
* Fix some typos (repeated words and it's/its) by [@eumiro](https://github.com/eumiro) in [#7063](https://github.com/pydantic/pydantic/pull/7063)
* Fix the typo in docstring by [@harunyasar](https://github.com/harunyasar) in [#7062](https://github.com/pydantic/pydantic/pull/7062)
* Docs: Fix broken URL in the pydantic-settings package recommendation by [@swetjen](https://github.com/swetjen) in [#6995](https://github.com/pydantic/pydantic/pull/6995)
* Handle constraints being applied to schemas that don't accept it by [@adriangb](https://github.com/adriangb) in [#6951](https://github.com/pydantic/pydantic/pull/6951)
* Replace almost_equal_floats with math.isclose by [@eumiro](https://github.com/eumiro) in [#7082](https://github.com/pydantic/pydantic/pull/7082)
* bump pydantic-core to 2.5.0 by [@davidhewitt](https://github.com/davidhewitt) in [#7077](https://github.com/pydantic/pydantic/pull/7077)
* Add `short_version` and use it in links by [@hramezani](https://github.com/hramezani) in [#7115](https://github.com/pydantic/pydantic/pull/7115)
* 📝 Add usage link to `RootModel` by [@Kludex](https://github.com/Kludex) in [#7113](https://github.com/pydantic/pydantic/pull/7113)
* Revert "Fix default port for mongosrv DSNs (#6827)" by [@Kludex](https://github.com/Kludex) in [#7116](https://github.com/pydantic/pydantic/pull/7116)
* Clarify validate_default and _Unset handling in usage docs and migration guide by [@benbenbang](https://github.com/benbenbang) in [#6950](https://github.com/pydantic/pydantic/pull/6950)
* Tweak documentation of `Field.exclude` by [@Viicos](https://github.com/Viicos) in [#7086](https://github.com/pydantic/pydantic/pull/7086)
* Do not require `validate_assignment` to use `Field.frozen` by [@Viicos](https://github.com/Viicos) in [#7103](https://github.com/pydantic/pydantic/pull/7103)
* tweaks to `_core_utils` by [@samuelcolvin](https://github.com/samuelcolvin) in [#7040](https://github.com/pydantic/pydantic/pull/7040)
* Make DefaultDict working with set by [@hramezani](https://github.com/hramezani) in [#7126](https://github.com/pydantic/pydantic/pull/7126)
* Don't always require typing.Generic as a base for partially parametrized models by [@dmontagu](https://github.com/dmontagu) in [#7119](https://github.com/pydantic/pydantic/pull/7119)
* Fix issue with JSON schema incorrectly using parent class core schema by [@dmontagu](https://github.com/dmontagu) in [#7020](https://github.com/pydantic/pydantic/pull/7020)
* Fix xfailed test related to TypedDict and alias_generator by [@dmontagu](https://github.com/dmontagu) in [#6940](https://github.com/pydantic/pydantic/pull/6940)
* Improve error message for NameEmail by [@dmontagu](https://github.com/dmontagu) in [#6939](https://github.com/pydantic/pydantic/pull/6939)
* Fix generic computed fields by [@dmontagu](https://github.com/dmontagu) in [#6988](https://github.com/pydantic/pydantic/pull/6988)
* Reflect namedtuple default values during validation by [@dmontagu](https://github.com/dmontagu) in [#7144](https://github.com/pydantic/pydantic/pull/7144)
* Update dependencies, fix pydantic-core usage, fix CI issues by [@dmontagu](https://github.com/dmontagu) in [#7150](https://github.com/pydantic/pydantic/pull/7150)
* Add mypy 1.5.0 by [@hramezani](https://github.com/hramezani) in [#7118](https://github.com/pydantic/pydantic/pull/7118)
* Handle non-json native enum values by [@adriangb](https://github.com/adriangb) in [#7056](https://github.com/pydantic/pydantic/pull/7056)
* document `round_trip` in Json type documentation  by [@jc-louis](https://github.com/jc-louis) in [#7137](https://github.com/pydantic/pydantic/pull/7137)
* Relax signature checks to better support builtins and C extension functions as validators by [@adriangb](https://github.com/adriangb) in [#7101](https://github.com/pydantic/pydantic/pull/7101)
* add union_mode='left_to_right' by [@davidhewitt](https://github.com/davidhewitt) in [#7151](https://github.com/pydantic/pydantic/pull/7151)
* Include an error message hint for inherited ordering by [@yvalencia91](https://github.com/yvalencia91) in [#7124](https://github.com/pydantic/pydantic/pull/7124)
* Fix one docs link and resolve some warnings for two others by [@dmontagu](https://github.com/dmontagu) in [#7153](https://github.com/pydantic/pydantic/pull/7153)
* Include Field extra keys name in warning by [@hramezani](https://github.com/hramezani) in [#7136](https://github.com/pydantic/pydantic/pull/7136)

## v2.1.1 (2023-07-25)

[GitHub release](https://github.com/pydantic/pydantic/releases/tag/v2.1.1)

* Skip FieldInfo merging when unnecessary by [@dmontagu](https://github.com/dmontagu) in [#6862](https://github.com/pydantic/pydantic/pull/6862)

## v2.1.0 (2023-07-25)

[GitHub release](https://github.com/pydantic/pydantic/releases/tag/v2.1.0)

* Add `StringConstraints` for use as Annotated metadata by [@adriangb](https://github.com/adriangb) in [#6605](https://github.com/pydantic/pydantic/pull/6605)
* Try to fix intermittently failing CI by [@adriangb](https://github.com/adriangb) in [#6683](https://github.com/pydantic/pydantic/pull/6683)
* Remove redundant example of optional vs default. by [@ehiggs-deliverect](https://github.com/ehiggs-deliverect) in [#6676](https://github.com/pydantic/pydantic/pull/6676)
* Docs update by [@samuelcolvin](https://github.com/samuelcolvin) in [#6692](https://github.com/pydantic/pydantic/pull/6692)
* Remove the Validate always section in validator docs by [@adriangb](https://github.com/adriangb) in [#6679](https://github.com/pydantic/pydantic/pull/6679)
* Fix recursion error in json schema generation by [@adriangb](https://github.com/adriangb) in [#6720](https://github.com/pydantic/pydantic/pull/6720)
* Fix incorrect subclass check for secretstr by [@AlexVndnblcke](https://github.com/AlexVndnblcke) in [#6730](https://github.com/pydantic/pydantic/pull/6730)
* update pdm / pdm lockfile to 2.8.0 by [@davidhewitt](https://github.com/davidhewitt) in [#6714](https://github.com/pydantic/pydantic/pull/6714)
* unpin pdm on more CI jobs by [@davidhewitt](https://github.com/davidhewitt) in [#6755](https://github.com/pydantic/pydantic/pull/6755)
* improve source locations for auxiliary packages in docs by [@davidhewitt](https://github.com/davidhewitt) in [#6749](https://github.com/pydantic/pydantic/pull/6749)
* Assume builtins don't accept an info argument by [@adriangb](https://github.com/adriangb) in [#6754](https://github.com/pydantic/pydantic/pull/6754)
* Fix bug where calling `help(BaseModelSubclass)` raises errors by [@hramezani](https://github.com/hramezani) in [#6758](https://github.com/pydantic/pydantic/pull/6758)
* Fix mypy plugin handling of `@model_validator(mode="after")` by [@ljodal](https://github.com/ljodal) in [#6753](https://github.com/pydantic/pydantic/pull/6753)
* update pydantic-core to 2.3.1 by [@davidhewitt](https://github.com/davidhewitt) in [#6756](https://github.com/pydantic/pydantic/pull/6756)
* Mypy plugin for settings by [@hramezani](https://github.com/hramezani) in [#6760](https://github.com/pydantic/pydantic/pull/6760)
* Use `contentSchema` keyword for JSON schema by [@dmontagu](https://github.com/dmontagu) in [#6715](https://github.com/pydantic/pydantic/pull/6715)
* fast-path checking finite decimals by [@davidhewitt](https://github.com/davidhewitt) in [#6769](https://github.com/pydantic/pydantic/pull/6769)
* Docs update by [@samuelcolvin](https://github.com/samuelcolvin) in [#6771](https://github.com/pydantic/pydantic/pull/6771)
* Improve json schema doc by [@hramezani](https://github.com/hramezani) in [#6772](https://github.com/pydantic/pydantic/pull/6772)
* Update validator docs by [@adriangb](https://github.com/adriangb) in [#6695](https://github.com/pydantic/pydantic/pull/6695)
* Fix typehint for wrap validator by [@dmontagu](https://github.com/dmontagu) in [#6788](https://github.com/pydantic/pydantic/pull/6788)
* 🐛 Fix validation warning for unions of Literal and other type by [@lig](https://github.com/lig) in [#6628](https://github.com/pydantic/pydantic/pull/6628)
* Update documentation for generics support in V2 by [@tpdorsey](https://github.com/tpdorsey) in [#6685](https://github.com/pydantic/pydantic/pull/6685)
* add pydantic-core build info to `version_info()` by [@samuelcolvin](https://github.com/samuelcolvin) in [#6785](https://github.com/pydantic/pydantic/pull/6785)
* Fix pydantic dataclasses that use slots with default values by [@dmontagu](https://github.com/dmontagu) in [#6796](https://github.com/pydantic/pydantic/pull/6796)
* Fix inheritance of hash function for frozen models by [@dmontagu](https://github.com/dmontagu) in [#6789](https://github.com/pydantic/pydantic/pull/6789)
* ✨ Add `SkipJsonSchema` annotation by [@Kludex](https://github.com/Kludex) in [#6653](https://github.com/pydantic/pydantic/pull/6653)
* Error if an invalid field name is used with Field by [@dmontagu](https://github.com/dmontagu) in [#6797](https://github.com/pydantic/pydantic/pull/6797)
* Add `GenericModel` to `MOVED_IN_V2` by [@adriangb](https://github.com/adriangb) in [#6776](https://github.com/pydantic/pydantic/pull/6776)
* Remove unused code from `docs/usage/types/custom.md` by [@hramezani](https://github.com/hramezani) in [#6803](https://github.com/pydantic/pydantic/pull/6803)
* Fix `float` -> `Decimal` coercion precision loss by [@adriangb](https://github.com/adriangb) in [#6810](https://github.com/pydantic/pydantic/pull/6810)
* remove email validation from the north star benchmark by [@davidhewitt](https://github.com/davidhewitt) in [#6816](https://github.com/pydantic/pydantic/pull/6816)
* Fix link to mypy by [@progsmile](https://github.com/progsmile) in [#6824](https://github.com/pydantic/pydantic/pull/6824)
* Improve initialization hooks example by [@hramezani](https://github.com/hramezani) in [#6822](https://github.com/pydantic/pydantic/pull/6822)
* Fix default port for mongosrv DSNs by [@dmontagu](https://github.com/dmontagu) in [#6827](https://github.com/pydantic/pydantic/pull/6827)
* Improve API documentation, in particular more links between usage and API docs by [@samuelcolvin](https://github.com/samuelcolvin) in [#6780](https://github.com/pydantic/pydantic/pull/6780)
* update pydantic-core to 2.4.0 by [@davidhewitt](https://github.com/davidhewitt) in [#6831](https://github.com/pydantic/pydantic/pull/6831)
* Fix `annotated_types.MaxLen` validator for custom sequence types by [@ImogenBits](https://github.com/ImogenBits) in [#6809](https://github.com/pydantic/pydantic/pull/6809)
* Update V1 by [@hramezani](https://github.com/hramezani) in [#6833](https://github.com/pydantic/pydantic/pull/6833)
* Make it so callable JSON schema extra works by [@dmontagu](https://github.com/dmontagu) in [#6798](https://github.com/pydantic/pydantic/pull/6798)
* Fix serialization issue with `InstanceOf` by [@dmontagu](https://github.com/dmontagu) in [#6829](https://github.com/pydantic/pydantic/pull/6829)
* Add back support for `json_encoders` by [@adriangb](https://github.com/adriangb) in [#6811](https://github.com/pydantic/pydantic/pull/6811)
* Update field annotations when building the schema by [@dmontagu](https://github.com/dmontagu) in [#6838](https://github.com/pydantic/pydantic/pull/6838)
* Use `WeakValueDictionary` to fix generic memory leak by [@dmontagu](https://github.com/dmontagu) in [#6681](https://github.com/pydantic/pydantic/pull/6681)
* Add `config.defer_build` to optionally make model building lazy by [@samuelcolvin](https://github.com/samuelcolvin) in [#6823](https://github.com/pydantic/pydantic/pull/6823)
* delegate `UUID` serialization to pydantic-core by [@davidhewitt](https://github.com/davidhewitt) in [#6850](https://github.com/pydantic/pydantic/pull/6850)
* Update `json_encoders` docs by [@adriangb](https://github.com/adriangb) in [#6848](https://github.com/pydantic/pydantic/pull/6848)
* Fix error message for `staticmethod`/`classmethod` order with validate_call by [@dmontagu](https://github.com/dmontagu) in [#6686](https://github.com/pydantic/pydantic/pull/6686)
* Improve documentation for `Config` by [@samuelcolvin](https://github.com/samuelcolvin) in [#6847](https://github.com/pydantic/pydantic/pull/6847)
* Update serialization doc to mention `Field.exclude` takes priority over call-time `include/exclude` by [@hramezani](https://github.com/hramezani) in [#6851](https://github.com/pydantic/pydantic/pull/6851)
* Allow customizing core schema generation by making `GenerateSchema` public by [@adriangb](https://github.com/adriangb) in [#6737](https://github.com/pydantic/pydantic/pull/6737)

## v2.0.3 (2023-07-05)

[GitHub release](https://github.com/pydantic/pydantic/releases/tag/v2.0.3)

* Mention PyObject (v1) moving to ImportString (v2) in migration doc by [@slafs](https://github.com/slafs) in [#6456](https://github.com/pydantic/pydantic/pull/6456)
* Fix release-tweet CI by [@Kludex](https://github.com/Kludex) in [#6461](https://github.com/pydantic/pydantic/pull/6461)
* Revise the section on required / optional / nullable fields. by [@ybressler](https://github.com/ybressler) in [#6468](https://github.com/pydantic/pydantic/pull/6468)
* Warn if a type hint is not in fact a type by [@adriangb](https://github.com/adriangb) in [#6479](https://github.com/pydantic/pydantic/pull/6479)
* Replace TransformSchema with GetPydanticSchema by [@dmontagu](https://github.com/dmontagu) in [#6484](https://github.com/pydantic/pydantic/pull/6484)
* Fix the un-hashability of various annotation types, for use in caching generic containers by [@dmontagu](https://github.com/dmontagu) in [#6480](https://github.com/pydantic/pydantic/pull/6480)
* PYD-164: Rework custom types docs by [@adriangb](https://github.com/adriangb) in [#6490](https://github.com/pydantic/pydantic/pull/6490)
* Fix ci by [@adriangb](https://github.com/adriangb) in [#6507](https://github.com/pydantic/pydantic/pull/6507)
* Fix forward ref in generic by [@adriangb](https://github.com/adriangb) in [#6511](https://github.com/pydantic/pydantic/pull/6511)
* Fix generation of serialization JSON schemas for core_schema.ChainSchema by [@dmontagu](https://github.com/dmontagu) in [#6515](https://github.com/pydantic/pydantic/pull/6515)
* Document the change in `Field.alias` behavior in Pydantic V2 by [@hramezani](https://github.com/hramezani) in [#6508](https://github.com/pydantic/pydantic/pull/6508)
* Give better error message attempting to compute the json schema of a model with undefined fields by [@dmontagu](https://github.com/dmontagu) in [#6519](https://github.com/pydantic/pydantic/pull/6519)
* Document `alias_priority` by [@tpdorsey](https://github.com/tpdorsey) in [#6520](https://github.com/pydantic/pydantic/pull/6520)
* Add redirect for types documentation by [@tpdorsey](https://github.com/tpdorsey) in [#6513](https://github.com/pydantic/pydantic/pull/6513)
* Allow updating docs without release by [@samuelcolvin](https://github.com/samuelcolvin) in [#6551](https://github.com/pydantic/pydantic/pull/6551)
* Ensure docs tests always run in the right folder by [@dmontagu](https://github.com/dmontagu) in [#6487](https://github.com/pydantic/pydantic/pull/6487)
* Defer evaluation of return type hints for serializer functions by [@dmontagu](https://github.com/dmontagu) in [#6516](https://github.com/pydantic/pydantic/pull/6516)
* Disable E501 from Ruff and rely on just Black by [@adriangb](https://github.com/adriangb) in [#6552](https://github.com/pydantic/pydantic/pull/6552)
* Update JSON Schema documentation for V2 by [@tpdorsey](https://github.com/tpdorsey) in [#6492](https://github.com/pydantic/pydantic/pull/6492)
* Add documentation of cyclic reference handling by [@dmontagu](https://github.com/dmontagu) in [#6493](https://github.com/pydantic/pydantic/pull/6493)
* Remove the need for change files by [@samuelcolvin](https://github.com/samuelcolvin) in [#6556](https://github.com/pydantic/pydantic/pull/6556)
* add "north star" benchmark by [@davidhewitt](https://github.com/davidhewitt) in [#6547](https://github.com/pydantic/pydantic/pull/6547)
* Update Dataclasses docs by [@tpdorsey](https://github.com/tpdorsey) in [#6470](https://github.com/pydantic/pydantic/pull/6470)
* ♻️ Use different error message on v1 redirects by [@Kludex](https://github.com/Kludex) in [#6595](https://github.com/pydantic/pydantic/pull/6595)
* ⬆ Upgrade `pydantic-core` to v2.2.0 by [@lig](https://github.com/lig) in [#6589](https://github.com/pydantic/pydantic/pull/6589)
* Fix serialization for IPvAny by [@dmontagu](https://github.com/dmontagu) in [#6572](https://github.com/pydantic/pydantic/pull/6572)
* Improve CI by using PDM instead of pip to install typing-extensions by [@adriangb](https://github.com/adriangb) in [#6602](https://github.com/pydantic/pydantic/pull/6602)
* Add `enum` error type docs  by [@lig](https://github.com/lig) in [#6603](https://github.com/pydantic/pydantic/pull/6603)
* 🐛 Fix `max_length` for unicode strings by [@lig](https://github.com/lig) in [#6559](https://github.com/pydantic/pydantic/pull/6559)
* Add documentation for accessing features via `pydantic.v1` by [@tpdorsey](https://github.com/tpdorsey) in [#6604](https://github.com/pydantic/pydantic/pull/6604)
* Include extra when iterating over a model by [@adriangb](https://github.com/adriangb) in [#6562](https://github.com/pydantic/pydantic/pull/6562)
* Fix typing of model_validator by [@adriangb](https://github.com/adriangb) in [#6514](https://github.com/pydantic/pydantic/pull/6514)
* Touch up Decimal validator by [@adriangb](https://github.com/adriangb) in [#6327](https://github.com/pydantic/pydantic/pull/6327)
* Fix various docstrings using fixed pytest-examples by [@dmontagu](https://github.com/dmontagu) in [#6607](https://github.com/pydantic/pydantic/pull/6607)
* Handle function validators in a discriminated union by [@dmontagu](https://github.com/dmontagu) in [#6570](https://github.com/pydantic/pydantic/pull/6570)
* Review json_schema.md by [@tpdorsey](https://github.com/tpdorsey) in [#6608](https://github.com/pydantic/pydantic/pull/6608)
* Make validate_call work on basemodel methods by [@dmontagu](https://github.com/dmontagu) in [#6569](https://github.com/pydantic/pydantic/pull/6569)
* add test for big int json serde by [@davidhewitt](https://github.com/davidhewitt) in [#6614](https://github.com/pydantic/pydantic/pull/6614)
* Fix pydantic dataclass problem with dataclasses.field default_factory by [@hramezani](https://github.com/hramezani) in [#6616](https://github.com/pydantic/pydantic/pull/6616)
* Fixed mypy type inference for TypeAdapter by [@zakstucke](https://github.com/zakstucke) in [#6617](https://github.com/pydantic/pydantic/pull/6617)
* Make it work to use None as a generic parameter by [@dmontagu](https://github.com/dmontagu) in [#6609](https://github.com/pydantic/pydantic/pull/6609)
* Make it work to use `$ref` as an alias by [@dmontagu](https://github.com/dmontagu) in [#6568](https://github.com/pydantic/pydantic/pull/6568)
* add note to migration guide about changes to `AnyUrl` etc by [@davidhewitt](https://github.com/davidhewitt) in [#6618](https://github.com/pydantic/pydantic/pull/6618)
* 🐛 Support defining `json_schema_extra` on `RootModel` using `Field` by [@lig](https://github.com/lig) in [#6622](https://github.com/pydantic/pydantic/pull/6622)
* Update pre-commit to prevent commits to main branch on accident by [@dmontagu](https://github.com/dmontagu) in [#6636](https://github.com/pydantic/pydantic/pull/6636)
* Fix PDM CI for python 3.7 on MacOS/windows by [@dmontagu](https://github.com/dmontagu) in [#6627](https://github.com/pydantic/pydantic/pull/6627)
* Produce more accurate signatures for pydantic dataclasses by [@dmontagu](https://github.com/dmontagu) in [#6633](https://github.com/pydantic/pydantic/pull/6633)
* Updates to Url types for Pydantic V2 by [@tpdorsey](https://github.com/tpdorsey) in [#6638](https://github.com/pydantic/pydantic/pull/6638)
* Fix list markdown in `transform` docstring by [@StefanBRas](https://github.com/StefanBRas) in [#6649](https://github.com/pydantic/pydantic/pull/6649)
* simplify slots_dataclass construction to appease mypy by [@davidhewitt](https://github.com/davidhewitt) in [#6639](https://github.com/pydantic/pydantic/pull/6639)
* Update TypedDict schema generation docstring by [@adriangb](https://github.com/adriangb) in [#6651](https://github.com/pydantic/pydantic/pull/6651)
* Detect and lint-error for prints by [@dmontagu](https://github.com/dmontagu) in [#6655](https://github.com/pydantic/pydantic/pull/6655)
* Add xfailing test for pydantic-core PR 766 by [@dmontagu](https://github.com/dmontagu) in [#6641](https://github.com/pydantic/pydantic/pull/6641)
* Ignore unrecognized fields from dataclasses metadata by [@dmontagu](https://github.com/dmontagu) in [#6634](https://github.com/pydantic/pydantic/pull/6634)
* Make non-existent class getattr a mypy error by [@dmontagu](https://github.com/dmontagu) in [#6658](https://github.com/pydantic/pydantic/pull/6658)
* Update pydantic-core to 2.3.0 by [@hramezani](https://github.com/hramezani) in [#6648](https://github.com/pydantic/pydantic/pull/6648)
* Use OrderedDict from typing_extensions by [@dmontagu](https://github.com/dmontagu) in [#6664](https://github.com/pydantic/pydantic/pull/6664)
* Fix typehint for JSON schema extra callable by [@dmontagu](https://github.com/dmontagu) in [#6659](https://github.com/pydantic/pydantic/pull/6659)

## v2.0.2 (2023-07-05)

[GitHub release](https://github.com/pydantic/pydantic/releases/tag/v2.0.2)

* Fix bug where round-trip pickling/unpickling a `RootModel` would change the value of `__dict__`, [#6457](https://github.com/pydantic/pydantic/pull/6457) by [@dmontagu](https://github.com/dmontagu)
* Allow single-item discriminated unions, [#6405](https://github.com/pydantic/pydantic/pull/6405) by [@dmontagu](https://github.com/dmontagu)
* Fix issue with union parsing of enums, [#6440](https://github.com/pydantic/pydantic/pull/6440) by [@dmontagu](https://github.com/dmontagu)
* Docs: Fixed `constr` documentation, renamed old `regex` to new `pattern`, [#6452](https://github.com/pydantic/pydantic/pull/6452) by [@miili](https://github.com/miili)
* Change `GenerateJsonSchema.generate_definitions` signature, [#6436](https://github.com/pydantic/pydantic/pull/6436) by [@dmontagu](https://github.com/dmontagu)

See the full changelog [here](https://github.com/pydantic/pydantic/releases/tag/v2.0.2)

## v2.0.1 (2023-07-04)

[GitHub release](https://github.com/pydantic/pydantic/releases/tag/v2.0.1)

First patch release of Pydantic V2

* Extra fields added via `setattr` (i.e. `m.some_extra_field = 'extra_value'`)
  are added to `.model_extra` if `model_config` `extra='allowed'`. Fixed [#6333](https://github.com/pydantic/pydantic/pull/6333), [#6365](https://github.com/pydantic/pydantic/pull/6365) by [@aaraney](https://github.com/aaraney)
* Automatically unpack JSON schema '$ref' for custom types, [#6343](https://github.com/pydantic/pydantic/pull/6343) by [@adriangb](https://github.com/adriangb)
* Fix tagged unions multiple processing in submodels, [#6340](https://github.com/pydantic/pydantic/pull/6340) by [@suharnikov](https://github.com/suharnikov)

See the full changelog [here](https://github.com/pydantic/pydantic/releases/tag/v2.0.1)

## v2.0 (2023-06-30)

[GitHub release](https://github.com/pydantic/pydantic/releases/tag/v2.0)

Pydantic V2 is here! :tada:

See [this post](https://docs.pydantic.dev/2.0/blog/pydantic-v2-final/) for more details.

## v2.0b3 (2023-06-16)

Third beta pre-release of Pydantic V2

See the full changelog [here](https://github.com/pydantic/pydantic/releases/tag/v2.0b3)

## v2.0b2 (2023-06-03)

Add `from_attributes` runtime flag to `TypeAdapter.validate_python` and `BaseModel.model_validate`.

See the full changelog [here](https://github.com/pydantic/pydantic/releases/tag/v2.0b2)

## v2.0b1 (2023-06-01)

First beta pre-release of Pydantic V2

See the full changelog [here](https://github.com/pydantic/pydantic/releases/tag/v2.0b1)

## v2.0a4 (2023-05-05)

Fourth pre-release of Pydantic V2

See the full changelog [here](https://github.com/pydantic/pydantic/releases/tag/v2.0a4)

## v2.0a3 (2023-04-20)

Third pre-release of Pydantic V2

See the full changelog [here](https://github.com/pydantic/pydantic/releases/tag/v2.0a3)

## v2.0a2 (2023-04-12)

Second pre-release of Pydantic V2

See the full changelog [here](https://github.com/pydantic/pydantic/releases/tag/v2.0a2)

## v2.0a1 (2023-04-03)

First pre-release of Pydantic V2!

See [this post](https://docs.pydantic.dev/blog/pydantic-v2-alpha/) for more details.

## v1.10.13 (2023-09-27)

* Fix: Add max length check to `pydantic.validate_email`, [#7673](https://github.com/pydantic/pydantic/issues/7673) by [@hramezani](https://github.com/hramezani)
* Docs: Fix pip commands to install v1, [#6930](https://github.com/pydantic/pydantic/issues/6930) by [@chbndrhnns](https://github.com/chbndrhnns)

## v1.10.12 (2023-07-24)

* Fixes the `maxlen` property being dropped on `deque` validation. Happened only if the deque item has been typed. Changes the `_validate_sequence_like` func, [#6581](https://github.com/pydantic/pydantic/pull/6581) by [@maciekglowka](https://github.com/maciekglowka)

## v1.10.11 (2023-07-04)

* Importing create_model in tools.py through relative path instead of absolute path - so that it doesn't import V2 code when copied over to V2 branch, [#6361](https://github.com/pydantic/pydantic/pull/6361) by [@SharathHuddar](https://github.com/SharathHuddar)

## v1.10.10 (2023-06-30)

* Add Pydantic `Json` field support to settings management, [#6250](https://github.com/pydantic/pydantic/pull/6250) by [@hramezani](https://github.com/hramezani)
* Fixed literal validator errors for unhashable values, [#6188](https://github.com/pydantic/pydantic/pull/6188) by [@markus1978](https://github.com/markus1978)
* Fixed bug with generics receiving forward refs, [#6130](https://github.com/pydantic/pydantic/pull/6130) by [@mark-todd](https://github.com/mark-todd)
* Update install method of FastAPI for internal tests in CI, [#6117](https://github.com/pydantic/pydantic/pull/6117) by [@Kludex](https://github.com/Kludex)

## v1.10.9 (2023-06-07)

* Fix trailing zeros not ignored in Decimal validation, [#5968](https://github.com/pydantic/pydantic/pull/5968) by [@hramezani](https://github.com/hramezani)
* Fix mypy plugin for v1.4.0, [#5928](https://github.com/pydantic/pydantic/pull/5928) by [@cdce8p](https://github.com/cdce8p)
* Add future and past date hypothesis strategies, [#5850](https://github.com/pydantic/pydantic/pull/5850) by [@bschoenmaeckers](https://github.com/bschoenmaeckers)
* Discourage usage of Cython 3 with Pydantic 1.x, [#5845](https://github.com/pydantic/pydantic/pull/5845) by [@lig](https://github.com/lig)

## v1.10.8 (2023-05-23)

* Fix a bug in `Literal` usage with `typing-extension==4.6.0`, [#5826](https://github.com/pydantic/pydantic/pull/5826) by [@hramezani](https://github.com/hramezani)
* This solves the (closed) issue [#3849](https://github.com/pydantic/pydantic/pull/3849) where aliased fields that use discriminated union fail to validate when the data contains the non-aliased field name, [#5736](https://github.com/pydantic/pydantic/pull/5736) by [@benwah](https://github.com/benwah)
* Update email-validator dependency to >=2.0.0post2, [#5627](https://github.com/pydantic/pydantic/pull/5627) by [@adriangb](https://github.com/adriangb)
* update `AnyClassMethod` for changes in [python/typeshed#9771](https://github.com/python/typeshed/issues/9771), [#5505](https://github.com/pydantic/pydantic/pull/5505) by [@ITProKyle](https://github.com/ITProKyle)

## v1.10.7 (2023-03-22)

* Fix creating schema from model using `ConstrainedStr` with `regex` as dict key, [#5223](https://github.com/pydantic/pydantic/pull/5223) by [@matejetz](https://github.com/matejetz)
* Address bug in mypy plugin caused by explicit_package_bases=True, [#5191](https://github.com/pydantic/pydantic/pull/5191) by [@dmontagu](https://github.com/dmontagu)
* Add implicit defaults in the mypy plugin for Field with no default argument, [#5190](https://github.com/pydantic/pydantic/pull/5190) by [@dmontagu](https://github.com/dmontagu)
* Fix schema generated for Enum values used as Literals in discriminated unions, [#5188](https://github.com/pydantic/pydantic/pull/5188) by [@javibookline](https://github.com/javibookline)
* Fix mypy failures caused by the pydantic mypy plugin when users define `from_orm` in their own classes, [#5187](https://github.com/pydantic/pydantic/pull/5187) by [@dmontagu](https://github.com/dmontagu)
* Fix `InitVar` usage with pydantic dataclasses, mypy version `1.1.1` and the custom mypy plugin, [#5162](https://github.com/pydantic/pydantic/pull/5162) by [@cdce8p](https://github.com/cdce8p)

## v1.10.6 (2023-03-08)

* Implement logic to support creating validators from non standard callables by using defaults to identify them and unwrapping `functools.partial` and `functools.partialmethod` when checking the signature, [#5126](https://github.com/pydantic/pydantic/pull/5126) by [@JensHeinrich](https://github.com/JensHeinrich)
* Fix mypy plugin for v1.1.1, and fix `dataclass_transform` decorator for pydantic dataclasses, [#5111](https://github.com/pydantic/pydantic/pull/5111) by [@cdce8p](https://github.com/cdce8p)
* Raise `ValidationError`, not `ConfigError`, when a discriminator value is unhashable, [#4773](https://github.com/pydantic/pydantic/pull/4773) by [@kurtmckee](https://github.com/kurtmckee)

## v1.10.5 (2023-02-15)

* Fix broken parametrized bases handling with `GenericModel`s with complex sets of models, [#5052](https://github.com/pydantic/pydantic/pull/5052) by [@MarkusSintonen](https://github.com/MarkusSintonen)
* Invalidate mypy cache if plugin config changes, [#5007](https://github.com/pydantic/pydantic/pull/5007) by [@cdce8p](https://github.com/cdce8p)
* Fix `RecursionError` when deep-copying dataclass types wrapped by pydantic, [#4949](https://github.com/pydantic/pydantic/pull/4949) by [@mbillingr](https://github.com/mbillingr)
* Fix `X | Y` union syntax breaking `GenericModel`, [#4146](https://github.com/pydantic/pydantic/pull/4146) by [@thenx](https://github.com/thenx)
* Switch coverage badge to show coverage for this branch/release, [#5060](https://github.com/pydantic/pydantic/pull/5060) by [@samuelcolvin](https://github.com/samuelcolvin)

## v1.10.4 (2022-12-30)

* Change dependency to `typing-extensions>=4.2.0`, [#4885](https://github.com/pydantic/pydantic/pull/4885) by [@samuelcolvin](https://github.com/samuelcolvin)

## v1.10.3 (2022-12-29)

**NOTE: v1.10.3 was ["yanked"](https://pypi.org/help/#yanked) from PyPI due to [#4885](https://github.com/pydantic/pydantic/pull/4885) which is fixed in v1.10.4**

* fix parsing of custom root models, [#4883](https://github.com/pydantic/pydantic/pull/4883) by [@gou177](https://github.com/gou177)
* fix: use dataclass proxy for frozen or empty dataclasses, [#4878](https://github.com/pydantic/pydantic/pull/4878) by [@PrettyWood](https://github.com/PrettyWood)
* Fix `schema` and `schema_json` on models where a model instance is a one of default values, [#4781](https://github.com/pydantic/pydantic/pull/4781) by [@Bobronium](https://github.com/Bobronium)
* Add Jina AI to sponsors on docs index page, [#4767](https://github.com/pydantic/pydantic/pull/4767) by [@samuelcolvin](https://github.com/samuelcolvin)
* fix: support assignment on `DataclassProxy`, [#4695](https://github.com/pydantic/pydantic/pull/4695) by [@PrettyWood](https://github.com/PrettyWood)
* Add `postgresql+psycopg` as allowed scheme for `PostgreDsn` to make it usable with SQLAlchemy 2, [#4689](https://github.com/pydantic/pydantic/pull/4689) by [@morian](https://github.com/morian)
* Allow dict schemas to have both `patternProperties` and `additionalProperties`, [#4641](https://github.com/pydantic/pydantic/pull/4641) by [@jparise](https://github.com/jparise)
* Fixes error passing None for optional lists with `unique_items`, [#4568](https://github.com/pydantic/pydantic/pull/4568) by [@mfulgo](https://github.com/mfulgo)
* Fix `GenericModel` with `Callable` param raising a `TypeError`, [#4551](https://github.com/pydantic/pydantic/pull/4551) by [@mfulgo](https://github.com/mfulgo)
* Fix field regex with `StrictStr` type annotation, [#4538](https://github.com/pydantic/pydantic/pull/4538) by [@sisp](https://github.com/sisp)
* Correct `dataclass_transform` keyword argument name from `field_descriptors` to `field_specifiers`, [#4500](https://github.com/pydantic/pydantic/pull/4500) by [@samuelcolvin](https://github.com/samuelcolvin)
* fix: avoid multiple calls of `__post_init__` when dataclasses are inherited, [#4487](https://github.com/pydantic/pydantic/pull/4487) by [@PrettyWood](https://github.com/PrettyWood)
* Reduce the size of binary wheels, [#2276](https://github.com/pydantic/pydantic/pull/2276) by [@samuelcolvin](https://github.com/samuelcolvin)

## v1.10.2 (2022-09-05)

* **Revert Change:** Revert percent encoding of URL parts which was originally added in [#4224](https://github.com/pydantic/pydantic/pull/4224), [#4470](https://github.com/pydantic/pydantic/pull/4470) by [@samuelcolvin](https://github.com/samuelcolvin)
* Prevent long (length > `4_300`) strings/bytes as input to int fields, see
  [python/cpython#95778](https://github.com/python/cpython/issues/95778) and
  [CVE-2020-10735](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10735), [#1477](https://github.com/pydantic/pydantic/pull/1477) by [@samuelcolvin](https://github.com/samuelcolvin)
* fix: dataclass wrapper was not always called, [#4477](https://github.com/pydantic/pydantic/pull/4477) by [@PrettyWood](https://github.com/PrettyWood)
* Use `tomllib` on Python 3.11 when parsing `mypy` configuration, [#4476](https://github.com/pydantic/pydantic/pull/4476) by [@hauntsaninja](https://github.com/hauntsaninja)
* Basic fix of `GenericModel` cache to detect order of arguments in `Union` models, [#4474](https://github.com/pydantic/pydantic/pull/4474) by [@sveinugu](https://github.com/sveinugu)
* Fix mypy plugin when using bare types like `list` and `dict` as `default_factory`, [#4457](https://github.com/pydantic/pydantic/pull/4457) by [@samuelcolvin](https://github.com/samuelcolvin)

## v1.10.1 (2022-08-31)

* Add `__hash__` method to `pydancic.color.Color` class, [#4454](https://github.com/pydantic/pydantic/pull/4454) by [@czaki](https://github.com/czaki)

## v1.10.0 (2022-08-30)

* Refactor the whole _pydantic_ `dataclass` decorator to really act like its standard lib equivalent.
  It hence keeps `__eq__`, `__hash__`, ... and makes comparison with its non-validated version possible.
  It also fixes usage of `frozen` dataclasses in fields and usage of `default_factory` in nested dataclasses.
  The support of `Config.extra` has been added.
  Finally, config customization directly via a `dict` is now possible, [#2557](https://github.com/pydantic/pydantic/pull/2557) by [@PrettyWood](https://github.com/PrettyWood)
  <br/><br/>
  **BREAKING CHANGES:**
  - The `compiled` boolean (whether _pydantic_ is compiled with cython) has been moved from `main.py` to `version.py`
  - Now that `Config.extra` is supported, `dataclass` ignores by default extra arguments (like `BaseModel`)
* Fix PEP487 `__set_name__` protocol in `BaseModel` for PrivateAttrs, [#4407](https://github.com/pydantic/pydantic/pull/4407) by [@tlambert03](https://github.com/tlambert03)
* Allow for custom parsing of environment variables via `parse_env_var` in `Config`, [#4406](https://github.com/pydantic/pydantic/pull/4406) by [@acmiyaguchi](https://github.com/acmiyaguchi)
* Rename `master` to `main`, [#4405](https://github.com/pydantic/pydantic/pull/4405) by [@hramezani](https://github.com/hramezani)
* Fix `StrictStr` does not raise `ValidationError` when `max_length` is present in `Field`, [#4388](https://github.com/pydantic/pydantic/pull/4388) by [@hramezani](https://github.com/hramezani)
* Make `SecretStr` and `SecretBytes` hashable, [#4387](https://github.com/pydantic/pydantic/pull/4387) by [@chbndrhnns](https://github.com/chbndrhnns)
* Fix `StrictBytes` does not raise `ValidationError` when `max_length` is present in `Field`, [#4380](https://github.com/pydantic/pydantic/pull/4380) by [@JeanArhancet](https://github.com/JeanArhancet)
* Add support for bare `type`, [#4375](https://github.com/pydantic/pydantic/pull/4375) by [@hramezani](https://github.com/hramezani)
* Support Python 3.11, including binaries for 3.11 in PyPI, [#4374](https://github.com/pydantic/pydantic/pull/4374) by [@samuelcolvin](https://github.com/samuelcolvin)
* Add support for `re.Pattern`, [#4366](https://github.com/pydantic/pydantic/pull/4366) by [@hramezani](https://github.com/hramezani)
* Fix `__post_init_post_parse__` is incorrectly passed keyword arguments when no `__post_init__` is defined, [#4361](https://github.com/pydantic/pydantic/pull/4361) by [@hramezani](https://github.com/hramezani)
* Fix implicitly importing `ForwardRef` and `Callable` from `pydantic.typing` instead of `typing` and also expose `MappingIntStrAny`, [#4358](https://github.com/pydantic/pydantic/pull/4358) by [@aminalaee](https://github.com/aminalaee)
* remove `Any` types from the `dataclass` decorator so it can be used with the `disallow_any_expr` mypy option, [#4356](https://github.com/pydantic/pydantic/pull/4356) by [@DetachHead](https://github.com/DetachHead)
* moved repo to `pydantic/pydantic`, [#4348](https://github.com/pydantic/pydantic/pull/4348) by [@yezz123](https://github.com/yezz123)
* fix "extra fields not permitted" error when dataclass with `Extra.forbid` is validated multiple times, [#4343](https://github.com/pydantic/pydantic/pull/4343) by [@detachhead](https://github.com/detachhead)
* Add Python 3.9 and 3.10 examples to docs, [#4339](https://github.com/pydantic/pydantic/pull/4339) by [@Bobronium](https://github.com/Bobronium)
* Discriminated union models now use `oneOf` instead of `anyOf` when generating OpenAPI schema definitions, [#4335](https://github.com/pydantic/pydantic/pull/4335) by [@MaxwellPayne](https://github.com/MaxwellPayne)
* Allow type checkers to infer inner type of `Json` type. `Json[list[str]]` will be now inferred as `list[str]`,
  `Json[Any]` should be used instead of plain `Json`.
  Runtime behaviour is not changed, [#4332](https://github.com/pydantic/pydantic/pull/4332) by [@Bobronium](https://github.com/Bobronium)
* Allow empty string aliases by using a `alias is not None` check, rather than `bool(alias)`, [#4253](https://github.com/pydantic/pydantic/pull/4253) by [@sergeytsaplin](https://github.com/sergeytsaplin)
* Update `ForwardRef`s in `Field.outer_type_`, [#4249](https://github.com/pydantic/pydantic/pull/4249) by [@JacobHayes](https://github.com/JacobHayes)
* The use of `__dataclass_transform__` has been replaced by `typing_extensions.dataclass_transform`, which is the preferred way to mark pydantic models as a dataclass under [PEP 681](https://peps.python.org/pep-0681/), [#4241](https://github.com/pydantic/pydantic/pull/4241) by [@multimeric](https://github.com/multimeric)
* Use parent model's `Config` when validating nested `NamedTuple` fields, [#4219](https://github.com/pydantic/pydantic/pull/4219) by [@synek](https://github.com/synek)
* Update `BaseModel.construct` to work with aliased Fields, [#4192](https://github.com/pydantic/pydantic/pull/4192) by [@kylebamos](https://github.com/kylebamos)
* Catch certain raised errors in `smart_deepcopy` and revert to `deepcopy` if so, [#4184](https://github.com/pydantic/pydantic/pull/4184) by [@coneybeare](https://github.com/coneybeare)
* Add `Config.anystr_upper` and `to_upper` kwarg to constr and conbytes, [#4165](https://github.com/pydantic/pydantic/pull/4165) by [@satheler](https://github.com/satheler)
* Fix JSON schema for `set` and `frozenset` when they include default values, [#4155](https://github.com/pydantic/pydantic/pull/4155) by [@aminalaee](https://github.com/aminalaee)
* Teach the mypy plugin that methods decorated by `@validator` are classmethods, [#4102](https://github.com/pydantic/pydantic/pull/4102) by [@DMRobertson](https://github.com/DMRobertson)
* Improve mypy plugin's ability to detect required fields, [#4086](https://github.com/pydantic/pydantic/pull/4086) by [@richardxia](https://github.com/richardxia)
* Support fields of type `Type[]` in schema, [#4051](https://github.com/pydantic/pydantic/pull/4051) by [@aminalaee](https://github.com/aminalaee)
* Add `default` value in JSON Schema when `const=True`, [#4031](https://github.com/pydantic/pydantic/pull/4031) by [@aminalaee](https://github.com/aminalaee)
* Adds reserved word check to signature generation logic, [#4011](https://github.com/pydantic/pydantic/pull/4011) by [@strue36](https://github.com/strue36)
* Fix Json strategy failure for the complex nested field, [#4005](https://github.com/pydantic/pydantic/pull/4005) by [@sergiosim](https://github.com/sergiosim)
* Add JSON-compatible float constraint `allow_inf_nan`, [#3994](https://github.com/pydantic/pydantic/pull/3994) by [@tiangolo](https://github.com/tiangolo)
* Remove undefined behaviour when `env_prefix` had characters in common with `env_nested_delimiter`, [#3975](https://github.com/pydantic/pydantic/pull/3975) by [@arsenron](https://github.com/arsenron)
* Support generics model with `create_model`, [#3945](https://github.com/pydantic/pydantic/pull/3945) by [@hot123s](https://github.com/hot123s)
* allow submodels to overwrite extra field info, [#3934](https://github.com/pydantic/pydantic/pull/3934) by [@PrettyWood](https://github.com/PrettyWood)
* Document and test structural pattern matching ([PEP 636](https://peps.python.org/pep-0636/)) on `BaseModel`, [#3920](https://github.com/pydantic/pydantic/pull/3920) by [@irgolic](https://github.com/irgolic)
* Fix incorrect deserialization of python timedelta object to ISO 8601 for negative time deltas.
  Minus was serialized in incorrect place ("P-1DT23H59M59.888735S" instead of correct "-P1DT23H59M59.888735S"), [#3899](https://github.com/pydantic/pydantic/pull/3899) by [@07pepa](https://github.com/07pepa)
* Fix validation of discriminated union fields with an alias when passing a model instance, [#3846](https://github.com/pydantic/pydantic/pull/3846) by [@chornsby](https://github.com/chornsby)
* Add a CockroachDsn type to validate CockroachDB connection strings. The type
  supports the following schemes: `cockroachdb`, `cockroachdb+psycopg2` and `cockroachdb+asyncpg`, [#3839](https://github.com/pydantic/pydantic/pull/3839) by [@blubber](https://github.com/blubber)
* Fix MyPy plugin to not override pre-existing `__init__` method in models, [#3824](https://github.com/pydantic/pydantic/pull/3824) by [@patrick91](https://github.com/patrick91)
* Fix mypy version checking, [#3783](https://github.com/pydantic/pydantic/pull/3783) by [@KotlinIsland](https://github.com/KotlinIsland)
* support overwriting dunder attributes of `BaseModel` instances, [#3777](https://github.com/pydantic/pydantic/pull/3777) by [@PrettyWood](https://github.com/PrettyWood)
* Added `ConstrainedDate` and `condate`, [#3740](https://github.com/pydantic/pydantic/pull/3740) by [@hottwaj](https://github.com/hottwaj)
* Support `kw_only` in dataclasses, [#3670](https://github.com/pydantic/pydantic/pull/3670) by [@detachhead](https://github.com/detachhead)
* Add comparison method for `Color` class, [#3646](https://github.com/pydantic/pydantic/pull/3646) by [@aminalaee](https://github.com/aminalaee)
* Drop support for python3.6, associated cleanup, [#3605](https://github.com/pydantic/pydantic/pull/3605) by [@samuelcolvin](https://github.com/samuelcolvin)
* created new function `to_lower_camel()` for "non pascal case" camel case, [#3463](https://github.com/pydantic/pydantic/pull/3463) by [@schlerp](https://github.com/schlerp)
* Add checks to `default` and `default_factory` arguments in Mypy plugin, [#3430](https://github.com/pydantic/pydantic/pull/3430) by [@klaa97](https://github.com/klaa97)
* fix mangling of `inspect.signature` for `BaseModel`, [#3413](https://github.com/pydantic/pydantic/pull/3413) by [@fix-inspect-signature](https://github.com/fix-inspect-signature)
* Adds the `SecretField` abstract class so that all the current and future secret fields like `SecretStr` and `SecretBytes` will derive from it, [#3409](https://github.com/pydantic/pydantic/pull/3409) by [@expobrain](https://github.com/expobrain)
* Support multi hosts validation in `PostgresDsn`, [#3337](https://github.com/pydantic/pydantic/pull/3337) by [@rglsk](https://github.com/rglsk)
* Fix parsing of very small numeric timedelta values, [#3315](https://github.com/pydantic/pydantic/pull/3315) by [@samuelcolvin](https://github.com/samuelcolvin)
* Update `SecretsSettingsSource` to respect `config.case_sensitive`, [#3273](https://github.com/pydantic/pydantic/pull/3273) by [@JeanArhancet](https://github.com/JeanArhancet)
* Add MongoDB network data source name (DSN) schema, [#3229](https://github.com/pydantic/pydantic/pull/3229) by [@snosratiershad](https://github.com/snosratiershad)
* Add support for multiple dotenv files, [#3222](https://github.com/pydantic/pydantic/pull/3222) by [@rekyungmin](https://github.com/rekyungmin)
* Raise an explicit `ConfigError` when multiple fields are incorrectly set for a single validator, [#3215](https://github.com/pydantic/pydantic/pull/3215) by [@SunsetOrange](https://github.com/SunsetOrange)
* Allow ellipsis on `Field`s inside `Annotated` for `TypedDicts` required, [#3133](https://github.com/pydantic/pydantic/pull/3133) by [@ezegomez](https://github.com/ezegomez)
* Catch overflow errors in `int_validator`, [#3112](https://github.com/pydantic/pydantic/pull/3112) by [@ojii](https://github.com/ojii)
* Adds a `__rich_repr__` method to `Representation` class which enables pretty printing with [Rich](https://github.com/willmcgugan/rich), [#3099](https://github.com/pydantic/pydantic/pull/3099) by [@willmcgugan](https://github.com/willmcgugan)
* Add percent encoding in `AnyUrl` and descendent types, [#3061](https://github.com/pydantic/pydantic/pull/3061) by [@FaresAhmedb](https://github.com/FaresAhmedb)
* `validate_arguments` decorator now supports `alias`, [#3019](https://github.com/pydantic/pydantic/pull/3019) by [@MAD-py](https://github.com/MAD-py)
* Avoid `__dict__` and `__weakref__` attributes in `AnyUrl` and IP address fields, [#2890](https://github.com/pydantic/pydantic/pull/2890) by [@nuno-andre](https://github.com/nuno-andre)
* Add ability to use `Final` in a field type annotation, [#2766](https://github.com/pydantic/pydantic/pull/2766) by [@uriyyo](https://github.com/uriyyo)
* Update requirement to `typing_extensions>=4.1.0` to guarantee `dataclass_transform` is available, [#4424](https://github.com/pydantic/pydantic/pull/4424) by [@commonism](https://github.com/commonism)
* Add Explosion and AWS to main sponsors, [#4413](https://github.com/pydantic/pydantic/pull/4413) by [@samuelcolvin](https://github.com/samuelcolvin)
* Update documentation for `copy_on_model_validation` to reflect recent changes, [#4369](https://github.com/pydantic/pydantic/pull/4369) by [@samuelcolvin](https://github.com/samuelcolvin)
* Runtime warning if `__slots__` is passed to `create_model`, `__slots__` is then ignored, [#4432](https://github.com/pydantic/pydantic/pull/4432) by [@samuelcolvin](https://github.com/samuelcolvin)
* Add type hints to `BaseSettings.Config` to avoid mypy errors, also correct mypy version compatibility notice in docs, [#4450](https://github.com/pydantic/pydantic/pull/4450) by [@samuelcolvin](https://github.com/samuelcolvin)

## v1.10.0b1 (2022-08-24)

Pre-release, see [the GitHub release](https://github.com/pydantic/pydantic/releases/tag/v1.10.0b1) for details.

## v1.10.0a2 (2022-08-24)

Pre-release, see [the GitHub release](https://github.com/pydantic/pydantic/releases/tag/v1.10.0a2) for details.

## v1.10.0a1 (2022-08-22)

Pre-release, see [the GitHub release](https://github.com/pydantic/pydantic/releases/tag/v1.10.0a1) for details.

## v1.9.2 (2022-08-11)

**Revert Breaking Change**: _v1.9.1_ introduced a breaking change where model fields were
deep copied by default, this release reverts the default behaviour to match _v1.9.0_ and before,
while also allow deep-copy behaviour via `copy_on_model_validation = 'deep'`. See [#4092](https://github.com/pydantic/pydantic/pull/4092) for more information.

* Allow for shallow copies of model fields, `Config.copy_on_model_validation` is now a str which must be
  `'none'`, `'deep'`, or `'shallow'` corresponding to not copying, deep copy & shallow copy; default `'shallow'`,
  [#4093](https://github.com/pydantic/pydantic/pull/4093) by [@timkpaine](https://github.com/timkpaine)

## v1.9.1 (2022-05-19)

Thank you to pydantic's sponsors:
[@tiangolo](https://github.com/tiangolo), [@stellargraph](https://github.com/stellargraph), [@JonasKs](https://github.com/JonasKs), [@grillazz](https://github.com/grillazz), [@Mazyod](https://github.com/Mazyod), [@kevinalh](https://github.com/kevinalh), [@chdsbd](https://github.com/chdsbd), [@povilasb](https://github.com/povilasb), [@povilasb](https://github.com/povilasb), [@jina-ai](https://github.com/jina-ai),
[@mainframeindustries](https://github.com/mainframeindustries), [@robusta-dev](https://github.com/robusta-dev), [@SendCloud](https://github.com/SendCloud), [@rszamszur](https://github.com/rszamszur), [@jodal](https://github.com/jodal), [@hardbyte](https://github.com/hardbyte), [@corleyma](https://github.com/corleyma), [@daddycocoaman](https://github.com/daddycocoaman),
[@Rehket](https://github.com/Rehket), [@jokull](https://github.com/jokull), [@reillysiemens](https://github.com/reillysiemens), [@westonsteimel](https://github.com/westonsteimel), [@primer-io](https://github.com/primer-io), [@koxudaxi](https://github.com/koxudaxi), [@browniebroke](https://github.com/browniebroke), [@stradivari96](https://github.com/stradivari96),
[@adriangb](https://github.com/adriangb), [@kamalgill](https://github.com/kamalgill), [@jqueguiner](https://github.com/jqueguiner), [@dev-zero](https://github.com/dev-zero), [@datarootsio](https://github.com/datarootsio), [@RedCarpetUp](https://github.com/RedCarpetUp)
for their kind support.

* Limit the size of `generics._generic_types_cache` and `generics._assigned_parameters`
  to avoid unlimited increase in memory usage, [#4083](https://github.com/pydantic/pydantic/pull/4083) by [@samuelcolvin](https://github.com/samuelcolvin)
* Add Jupyverse and FPS as Jupyter projects using pydantic, [#4082](https://github.com/pydantic/pydantic/pull/4082) by [@davidbrochart](https://github.com/davidbrochart)
* Speedup `__isinstancecheck__` on pydantic models when the type is not a model, may also avoid memory "leaks", [#4081](https://github.com/pydantic/pydantic/pull/4081) by [@samuelcolvin](https://github.com/samuelcolvin)
* Fix in-place modification of `FieldInfo` that caused problems with PEP 593 type aliases, [#4067](https://github.com/pydantic/pydantic/pull/4067) by [@adriangb](https://github.com/adriangb)
* Add support for autocomplete in VS Code via `__dataclass_transform__` when using `pydantic.dataclasses.dataclass`, [#4006](https://github.com/pydantic/pydantic/pull/4006) by [@giuliano-oliveira](https://github.com/giuliano-oliveira)
* Remove benchmarks from codebase and docs, [#3973](https://github.com/pydantic/pydantic/pull/3973) by [@samuelcolvin](https://github.com/samuelcolvin)
* Typing checking with pyright in CI, improve docs on vscode/pylance/pyright, [#3972](https://github.com/pydantic/pydantic/pull/3972) by [@samuelcolvin](https://github.com/samuelcolvin)
* Fix nested Python dataclass schema regression, [#3819](https://github.com/pydantic/pydantic/pull/3819) by [@himbeles](https://github.com/himbeles)
* Update documentation about lazy evaluation of sources for Settings, [#3806](https://github.com/pydantic/pydantic/pull/3806) by [@garyd203](https://github.com/garyd203)
* Prevent subclasses of bytes being converted to bytes, [#3706](https://github.com/pydantic/pydantic/pull/3706) by [@samuelcolvin](https://github.com/samuelcolvin)
* Fixed "error checking inheritance of" when using PEP585 and PEP604 type hints, [#3681](https://github.com/pydantic/pydantic/pull/3681) by [@aleksul](https://github.com/aleksul)
* Allow self referencing `ClassVar`s in models, [#3679](https://github.com/pydantic/pydantic/pull/3679) by [@samuelcolvin](https://github.com/samuelcolvin)
* **Breaking Change, see [#4106](https://github.com/pydantic/pydantic/pull/4106)**: Fix issue with self-referencing dataclass, [#3675](https://github.com/pydantic/pydantic/pull/3675) by [@uriyyo](https://github.com/uriyyo)
* Include non-standard port numbers in rendered URLs, [#3652](https://github.com/pydantic/pydantic/pull/3652) by [@dolfinus](https://github.com/dolfinus)
* `Config.copy_on_model_validation` does a deep copy and not a shallow one, [#3641](https://github.com/pydantic/pydantic/pull/3641) by [@PrettyWood](https://github.com/PrettyWood)
* fix: clarify that discriminated unions do not support singletons, [#3636](https://github.com/pydantic/pydantic/pull/3636) by [@tommilligan](https://github.com/tommilligan)
* Add `read_text(encoding='utf-8')` for `setup.py`, [#3625](https://github.com/pydantic/pydantic/pull/3625) by [@hswong3i](https://github.com/hswong3i)
* Fix JSON Schema generation for Discriminated Unions within lists, [#3608](https://github.com/pydantic/pydantic/pull/3608) by [@samuelcolvin](https://github.com/samuelcolvin)

## v1.9.0 (2021-12-31)

Thank you to pydantic's sponsors:
[@sthagen](https://github.com/sthagen), [@timdrijvers](https://github.com/timdrijvers), [@toinbis](https://github.com/toinbis), [@koxudaxi](https://github.com/koxudaxi), [@ginomempin](https://github.com/ginomempin), [@primer-io](https://github.com/primer-io), [@and-semakin](https://github.com/and-semakin), [@westonsteimel](https://github.com/westonsteimel), [@reillysiemens](https://github.com/reillysiemens),
[@es3n1n](https://github.com/es3n1n), [@jokull](https://github.com/jokull), [@JonasKs](https://github.com/JonasKs), [@Rehket](https://github.com/Rehket), [@corleyma](https://github.com/corleyma), [@daddycocoaman](https://github.com/daddycocoaman), [@hardbyte](https://github.com/hardbyte), [@datarootsio](https://github.com/datarootsio), [@jodal](https://github.com/jodal), [@aminalaee](https://github.com/aminalaee), [@rafsaf](https://github.com/rafsaf),
[@jqueguiner](https://github.com/jqueguiner), [@chdsbd](https://github.com/chdsbd), [@kevinalh](https://github.com/kevinalh), [@Mazyod](https://github.com/Mazyod), [@grillazz](https://github.com/grillazz), [@JonasKs](https://github.com/JonasKs), [@simw](https://github.com/simw), [@leynier](https://github.com/leynier), [@xfenix](https://github.com/xfenix)
for their kind support.

### Highlights

* add Python 3.10 support, [#2885](https://github.com/pydantic/pydantic/pull/2885) by [@PrettyWood](https://github.com/PrettyWood)
* [Discriminated unions](https://docs.pydantic.dev/usage/types/#discriminated-unions-aka-tagged-unions), [#619](https://github.com/pydantic/pydantic/pull/619) by [@PrettyWood](https://github.com/PrettyWood)
* [`Config.smart_union` for better union logic](https://docs.pydantic.dev/usage/model_config/#smart-union), [#2092](https://github.com/pydantic/pydantic/pull/2092) by [@PrettyWood](https://github.com/PrettyWood)
* Binaries for Macos M1 CPUs, [#3498](https://github.com/pydantic/pydantic/pull/3498) by [@samuelcolvin](https://github.com/samuelcolvin)
* Complex types can be set via [nested environment variables](https://docs.pydantic.dev/usage/settings/#parsing-environment-variable-values), e.g. `foo___bar`, [#3159](https://github.com/pydantic/pydantic/pull/3159) by [@Air-Mark](https://github.com/Air-Mark)
* add a dark mode to _pydantic_ documentation, [#2913](https://github.com/pydantic/pydantic/pull/2913) by [@gbdlin](https://github.com/gbdlin)
* Add support for autocomplete in VS Code via `__dataclass_transform__`, [#2721](https://github.com/pydantic/pydantic/pull/2721) by [@tiangolo](https://github.com/tiangolo)
* Add "exclude" as a field parameter so that it can be configured using model config, [#660](https://github.com/pydantic/pydantic/pull/660) by [@daviskirk](https://github.com/daviskirk)

### v1.9.0 (2021-12-31) Changes

* Apply `update_forward_refs` to `Config.json_encodes` prevent name clashes in types defined via strings, [#3583](https://github.com/pydantic/pydantic/pull/3583) by [@samuelcolvin](https://github.com/samuelcolvin)
* Extend pydantic's mypy plugin to support mypy versions `0.910`, `0.920`, `0.921` & `0.930`, [#3573](https://github.com/pydantic/pydantic/pull/3573) & [#3594](https://github.com/pydantic/pydantic/pull/3594) by [@PrettyWood](https://github.com/PrettyWood), [@christianbundy](https://github.com/christianbundy), [@samuelcolvin](https://github.com/samuelcolvin)

### v1.9.0a2 (2021-12-24) Changes

* support generic models with discriminated union, [#3551](https://github.com/pydantic/pydantic/pull/3551) by [@PrettyWood](https://github.com/PrettyWood)
* keep old behaviour of `json()` by default, [#3542](https://github.com/pydantic/pydantic/pull/3542) by [@PrettyWood](https://github.com/PrettyWood)
* Removed typing-only `__root__` attribute from `BaseModel`, [#3540](https://github.com/pydantic/pydantic/pull/3540) by [@layday](https://github.com/layday)
* Build Python 3.10 wheels, [#3539](https://github.com/pydantic/pydantic/pull/3539) by [@mbachry](https://github.com/mbachry)
* Fix display of `extra` fields with model `__repr__`, [#3234](https://github.com/pydantic/pydantic/pull/3234) by [@cocolman](https://github.com/cocolman)
* models copied via `Config.copy_on_model_validation` always have all fields, [#3201](https://github.com/pydantic/pydantic/pull/3201) by [@PrettyWood](https://github.com/PrettyWood)
* nested ORM from nested dictionaries, [#3182](https://github.com/pydantic/pydantic/pull/3182) by [@PrettyWood](https://github.com/PrettyWood)
* fix link to discriminated union section by [@PrettyWood](https://github.com/PrettyWood)

### v1.9.0a1 (2021-12-18) Changes

* Add support for `Decimal`-specific validation configurations in `Field()`, additionally to using `condecimal()`,
  to allow better support from editors and tooling, [#3507](https://github.com/pydantic/pydantic/pull/3507) by [@tiangolo](https://github.com/tiangolo)
* Add `arm64` binaries suitable for MacOS with an M1 CPU to PyPI, [#3498](https://github.com/pydantic/pydantic/pull/3498) by [@samuelcolvin](https://github.com/samuelcolvin)
* Fix issue where `None` was considered invalid when using a `Union` type containing `Any` or `object`, [#3444](https://github.com/pydantic/pydantic/pull/3444) by [@tharradine](https://github.com/tharradine)
* When generating field schema, pass optional `field` argument (of type
  `pydantic.fields.ModelField`) to `__modify_schema__()` if present, [#3434](https://github.com/pydantic/pydantic/pull/3434) by [@jasujm](https://github.com/jasujm)
* Fix issue when pydantic fail to parse `typing.ClassVar` string type annotation, [#3401](https://github.com/pydantic/pydantic/pull/3401) by [@uriyyo](https://github.com/uriyyo)
* Mention Python >= 3.9.2 as an alternative to `typing_extensions.TypedDict`, [#3374](https://github.com/pydantic/pydantic/pull/3374) by [@BvB93](https://github.com/BvB93)
* Changed the validator method name in the [Custom Errors example](https://docs.pydantic.dev/usage/models/#custom-errors)
  to more accurately describe what the validator is doing; changed from `name_must_contain_space` to ` value_must_equal_bar`, [#3327](https://github.com/pydantic/pydantic/pull/3327) by [@michaelrios28](https://github.com/michaelrios28)
* Add `AmqpDsn` class, [#3254](https://github.com/pydantic/pydantic/pull/3254) by [@kludex](https://github.com/kludex)
* Always use `Enum` value as default in generated JSON schema, [#3190](https://github.com/pydantic/pydantic/pull/3190) by [@joaommartins](https://github.com/joaommartins)
* Add support for Mypy 0.920, [#3175](https://github.com/pydantic/pydantic/pull/3175) by [@christianbundy](https://github.com/christianbundy)
* `validate_arguments` now supports `extra` customization (used to always be `Extra.forbid`), [#3161](https://github.com/pydantic/pydantic/pull/3161) by [@PrettyWood](https://github.com/PrettyWood)
* Complex types can be set by nested environment variables, [#3159](https://github.com/pydantic/pydantic/pull/3159) by [@Air-Mark](https://github.com/Air-Mark)
* Fix mypy plugin to collect fields based on `pydantic.utils.is_valid_field` so that it ignores untyped private variables, [#3146](https://github.com/pydantic/pydantic/pull/3146) by [@hi-ogawa](https://github.com/hi-ogawa)
* fix `validate_arguments` issue with `Config.validate_all`, [#3135](https://github.com/pydantic/pydantic/pull/3135) by [@PrettyWood](https://github.com/PrettyWood)
* avoid dict coercion when using dict subclasses as field type, [#3122](https://github.com/pydantic/pydantic/pull/3122) by [@PrettyWood](https://github.com/PrettyWood)
* add support for `object` type, [#3062](https://github.com/pydantic/pydantic/pull/3062) by [@PrettyWood](https://github.com/PrettyWood)
* Updates pydantic dataclasses to keep `_special` properties on parent classes, [#3043](https://github.com/pydantic/pydantic/pull/3043) by [@zulrang](https://github.com/zulrang)
* Add a `TypedDict` class for error objects, [#3038](https://github.com/pydantic/pydantic/pull/3038) by [@matthewhughes934](https://github.com/matthewhughes934)
* Fix support for using a subclass of an annotation as a default, [#3018](https://github.com/pydantic/pydantic/pull/3018) by [@JacobHayes](https://github.com/JacobHayes)
* make `create_model_from_typeddict` mypy compliant, [#3008](https://github.com/pydantic/pydantic/pull/3008) by [@PrettyWood](https://github.com/PrettyWood)
* Make multiple inheritance work when using `PrivateAttr`, [#2989](https://github.com/pydantic/pydantic/pull/2989) by [@hmvp](https://github.com/hmvp)
* Parse environment variables as JSON, if they have a `Union` type with a complex subfield, [#2936](https://github.com/pydantic/pydantic/pull/2936) by [@cbartz](https://github.com/cbartz)
* Prevent `StrictStr` permitting `Enum` values where the enum inherits from `str`, [#2929](https://github.com/pydantic/pydantic/pull/2929) by [@samuelcolvin](https://github.com/samuelcolvin)
* Make `SecretsSettingsSource` parse values being assigned to fields of complex types when sourced from a secrets file,
  just as when sourced from environment variables, [#2917](https://github.com/pydantic/pydantic/pull/2917) by [@davidmreed](https://github.com/davidmreed)
* add a dark mode to _pydantic_ documentation, [#2913](https://github.com/pydantic/pydantic/pull/2913) by [@gbdlin](https://github.com/gbdlin)
* Make `pydantic-mypy` plugin compatible with `pyproject.toml` configuration, consistent with `mypy` changes.
  See the [doc](https://docs.pydantic.dev/mypy_plugin/#configuring-the-plugin) for more information, [#2908](https://github.com/pydantic/pydantic/pull/2908) by [@jrwalk](https://github.com/jrwalk)
* add Python 3.10 support, [#2885](https://github.com/pydantic/pydantic/pull/2885) by [@PrettyWood](https://github.com/PrettyWood)
* Correctly parse generic models with `Json[T]`, [#2860](https://github.com/pydantic/pydantic/pull/2860) by [@geekingfrog](https://github.com/geekingfrog)
* Update contrib docs re: Python version to use for building docs, [#2856](https://github.com/pydantic/pydantic/pull/2856) by [@paxcodes](https://github.com/paxcodes)
* Clarify documentation about _pydantic_'s support for custom validation and strict type checking,
  despite _pydantic_ being primarily a parsing library, [#2855](https://github.com/pydantic/pydantic/pull/2855) by [@paxcodes](https://github.com/paxcodes)
* Fix schema generation for `Deque` fields, [#2810](https://github.com/pydantic/pydantic/pull/2810) by [@sergejkozin](https://github.com/sergejkozin)
* fix an edge case when mixing constraints and `Literal`, [#2794](https://github.com/pydantic/pydantic/pull/2794) by [@PrettyWood](https://github.com/PrettyWood)
* Fix postponed annotation resolution for `NamedTuple` and `TypedDict` when they're used directly as the type of fields
  within Pydantic models, [#2760](https://github.com/pydantic/pydantic/pull/2760) by [@jameysharp](https://github.com/jameysharp)
* Fix bug when `mypy` plugin fails on `construct` method call for `BaseSettings` derived classes, [#2753](https://github.com/pydantic/pydantic/pull/2753) by [@uriyyo](https://github.com/uriyyo)
* Add function overloading for a `pydantic.create_model` function, [#2748](https://github.com/pydantic/pydantic/pull/2748) by [@uriyyo](https://github.com/uriyyo)
* Fix mypy plugin issue with self field declaration, [#2743](https://github.com/pydantic/pydantic/pull/2743) by [@uriyyo](https://github.com/uriyyo)
* The colon at the end of the line "The fields which were supplied when user was initialised:" suggests that the code following it is related.
  Changed it to a period, [#2733](https://github.com/pydantic/pydantic/pull/2733) by [@krisaoe](https://github.com/krisaoe)
* Renamed variable `schema` to `schema_` to avoid shadowing of global variable name, [#2724](https://github.com/pydantic/pydantic/pull/2724) by [@shahriyarr](https://github.com/shahriyarr)
* Add support for autocomplete in VS Code via `__dataclass_transform__`, [#2721](https://github.com/pydantic/pydantic/pull/2721) by [@tiangolo](https://github.com/tiangolo)
* add missing type annotations in `BaseConfig` and handle `max_length = 0`, [#2719](https://github.com/pydantic/pydantic/pull/2719) by [@PrettyWood](https://github.com/PrettyWood)
* Change `orm_mode` checking to allow recursive ORM mode parsing with dicts, [#2718](https://github.com/pydantic/pydantic/pull/2718) by [@nuno-andre](https://github.com/nuno-andre)
* Add episode 313 of the *Talk Python To Me* podcast, where Michael Kennedy and Samuel Colvin discuss Pydantic, to the docs, [#2712](https://github.com/pydantic/pydantic/pull/2712) by [@RatulMaharaj](https://github.com/RatulMaharaj)
* fix JSON schema generation when a field is of type `NamedTuple` and has a default value, [#2707](https://github.com/pydantic/pydantic/pull/2707) by [@PrettyWood](https://github.com/PrettyWood)
* `Enum` fields now properly support extra kwargs in schema generation, [#2697](https://github.com/pydantic/pydantic/pull/2697) by [@sammchardy](https://github.com/sammchardy)
* **Breaking Change, see [#3780](https://github.com/pydantic/pydantic/pull/3780)**: Make serialization of referenced pydantic models possible, [#2650](https://github.com/pydantic/pydantic/pull/2650) by [@PrettyWood](https://github.com/PrettyWood)
* Add `uniqueItems` option to `ConstrainedList`, [#2618](https://github.com/pydantic/pydantic/pull/2618) by [@nuno-andre](https://github.com/nuno-andre)
* Try to evaluate forward refs automatically at model creation, [#2588](https://github.com/pydantic/pydantic/pull/2588) by [@uriyyo](https://github.com/uriyyo)
* Switch docs preview and coverage display to use [smokeshow](https://smokeshow.helpmanual.io/), [#2580](https://github.com/pydantic/pydantic/pull/2580) by [@samuelcolvin](https://github.com/samuelcolvin)
* Add `__version__` attribute to pydantic module, [#2572](https://github.com/pydantic/pydantic/pull/2572) by [@paxcodes](https://github.com/paxcodes)
* Add `postgresql+asyncpg`, `postgresql+pg8000`, `postgresql+psycopg2`, `postgresql+psycopg2cffi`, `postgresql+py-postgresql`
  and `postgresql+pygresql` schemes for `PostgresDsn`, [#2567](https://github.com/pydantic/pydantic/pull/2567) by [@postgres-asyncpg](https://github.com/postgres-asyncpg)
* Enable the Hypothesis plugin to generate a constrained decimal when the `decimal_places` argument is specified, [#2524](https://github.com/pydantic/pydantic/pull/2524) by [@cwe5590](https://github.com/cwe5590)
* Allow `collections.abc.Callable` to be used as type in Python 3.9, [#2519](https://github.com/pydantic/pydantic/pull/2519) by [@daviskirk](https://github.com/daviskirk)
* Documentation update how to custom compile pydantic when using pip install, small change in `setup.py`
  to allow for custom CFLAGS when compiling, [#2517](https://github.com/pydantic/pydantic/pull/2517) by [@peterroelants](https://github.com/peterroelants)
* remove side effect of `default_factory` to run it only once even if `Config.validate_all` is set, [#2515](https://github.com/pydantic/pydantic/pull/2515) by [@PrettyWood](https://github.com/PrettyWood)
* Add lookahead to ip regexes for `AnyUrl` hosts. This allows urls with DNS labels
  looking like IPs to validate as they are perfectly valid host names, [#2512](https://github.com/pydantic/pydantic/pull/2512) by [@sbv-csis](https://github.com/sbv-csis)
* Set `minItems` and `maxItems` in generated JSON schema for fixed-length tuples, [#2497](https://github.com/pydantic/pydantic/pull/2497) by [@PrettyWood](https://github.com/PrettyWood)
* Add `strict` argument to `conbytes`, [#2489](https://github.com/pydantic/pydantic/pull/2489) by [@koxudaxi](https://github.com/koxudaxi)
* Support user defined generic field types in generic models, [#2465](https://github.com/pydantic/pydantic/pull/2465) by [@daviskirk](https://github.com/daviskirk)
* Add an example and a short explanation of subclassing `GetterDict` to docs, [#2463](https://github.com/pydantic/pydantic/pull/2463) by [@nuno-andre](https://github.com/nuno-andre)
* add `KafkaDsn` type, `HttpUrl` now has default port 80 for http and 443 for https, [#2447](https://github.com/pydantic/pydantic/pull/2447) by [@MihanixA](https://github.com/MihanixA)
* Add `PastDate` and `FutureDate` types, [#2425](https://github.com/pydantic/pydantic/pull/2425) by [@Kludex](https://github.com/Kludex)
* Support generating schema for `Generic` fields with subtypes, [#2375](https://github.com/pydantic/pydantic/pull/2375) by [@maximberg](https://github.com/maximberg)
* fix(encoder): serialize `NameEmail` to str, [#2341](https://github.com/pydantic/pydantic/pull/2341) by [@alecgerona](https://github.com/alecgerona)
* add `Config.smart_union` to prevent coercion in `Union` if possible, see
 [the doc](https://docs.pydantic.dev/usage/model_config/#smart-union) for more information, [#2092](https://github.com/pydantic/pydantic/pull/2092) by [@PrettyWood](https://github.com/PrettyWood)
* Add ability to use `typing.Counter` as a model field type, [#2060](https://github.com/pydantic/pydantic/pull/2060) by [@uriyyo](https://github.com/uriyyo)
* Add parameterised subclasses to `__bases__` when constructing new parameterised classes, so that `A <: B => A[int] <: B[int]`, [#2007](https://github.com/pydantic/pydantic/pull/2007) by [@diabolo-dan](https://github.com/diabolo-dan)
* Create `FileUrl` type that allows URLs that conform to [RFC 8089](https://tools.ietf.org/html/rfc8089#section-2).
  Add `host_required` parameter, which is `True` by default (`AnyUrl` and subclasses), `False` in `RedisDsn`, `FileUrl`, [#1983](https://github.com/pydantic/pydantic/pull/1983) by [@vgerak](https://github.com/vgerak)
* add `confrozenset()`, analogous to `conset()` and `conlist()`, [#1897](https://github.com/pydantic/pydantic/pull/1897) by [@PrettyWood](https://github.com/PrettyWood)
* stop calling parent class `root_validator` if overridden, [#1895](https://github.com/pydantic/pydantic/pull/1895) by [@PrettyWood](https://github.com/PrettyWood)
* Add `repr` (defaults to `True`) parameter to `Field`, to hide it from the default representation of the `BaseModel`, [#1831](https://github.com/pydantic/pydantic/pull/1831) by [@fnep](https://github.com/fnep)
* Accept empty query/fragment URL parts, [#1807](https://github.com/pydantic/pydantic/pull/1807) by [@xavier](https://github.com/xavier)

## v1.8.2 (2021-05-11)

!!! warning
    A security vulnerability, level "moderate" is fixed in v1.8.2. Please upgrade **ASAP**.
    See security advisory [CVE-2021-29510](https://github.com/pydantic/pydantic/security/advisories/GHSA-5jqp-qgf6-3pvh)

* **Security fix:** Fix `date` and `datetime` parsing so passing either `'infinity'` or `float('inf')`
  (or their negative values) does not cause an infinite loop,
  see security advisory [CVE-2021-29510](https://github.com/pydantic/pydantic/security/advisories/GHSA-5jqp-qgf6-3pvh)
* fix schema generation with Enum by generating a valid name, [#2575](https://github.com/pydantic/pydantic/pull/2575) by [@PrettyWood](https://github.com/PrettyWood)
* fix JSON schema generation with a `Literal` of an enum member, [#2536](https://github.com/pydantic/pydantic/pull/2536) by [@PrettyWood](https://github.com/PrettyWood)
* Fix bug with configurations declarations that are passed as
  keyword arguments during class creation, [#2532](https://github.com/pydantic/pydantic/pull/2532) by [@uriyyo](https://github.com/uriyyo)
* Allow passing `json_encoders` in class kwargs, [#2521](https://github.com/pydantic/pydantic/pull/2521) by [@layday](https://github.com/layday)
* support arbitrary types with custom `__eq__`, [#2483](https://github.com/pydantic/pydantic/pull/2483) by [@PrettyWood](https://github.com/PrettyWood)
* support `Annotated` in `validate_arguments` and in generic models with Python 3.9, [#2483](https://github.com/pydantic/pydantic/pull/2483) by [@PrettyWood](https://github.com/PrettyWood)

## v1.8.1 (2021-03-03)

Bug fixes for regressions and new features from `v1.8`

* allow elements of `Config.field` to update elements of a `Field`, [#2461](https://github.com/pydantic/pydantic/pull/2461) by [@samuelcolvin](https://github.com/samuelcolvin)
* fix validation with a `BaseModel` field and a custom root type, [#2449](https://github.com/pydantic/pydantic/pull/2449) by [@PrettyWood](https://github.com/PrettyWood)
* expose `Pattern` encoder to `fastapi`, [#2444](https://github.com/pydantic/pydantic/pull/2444) by [@PrettyWood](https://github.com/PrettyWood)
* enable the Hypothesis plugin to generate a constrained float when the `multiple_of` argument is specified, [#2442](https://github.com/pydantic/pydantic/pull/2442) by [@tobi-lipede-oodle](https://github.com/tobi-lipede-oodle)
* Avoid `RecursionError` when using some types like `Enum` or `Literal` with generic models, [#2436](https://github.com/pydantic/pydantic/pull/2436) by [@PrettyWood](https://github.com/PrettyWood)
* do not overwrite declared `__hash__` in subclasses of a model, [#2422](https://github.com/pydantic/pydantic/pull/2422) by [@PrettyWood](https://github.com/PrettyWood)
* fix `mypy` complaints on `Path` and `UUID` related custom types, [#2418](https://github.com/pydantic/pydantic/pull/2418) by [@PrettyWood](https://github.com/PrettyWood)
* Support properly variable length tuples of compound types, [#2416](https://github.com/pydantic/pydantic/pull/2416) by [@PrettyWood](https://github.com/PrettyWood)

## v1.8 (2021-02-26)

Thank you to pydantic's sponsors:
[@jorgecarleitao](https://github.com/jorgecarleitao), [@BCarley](https://github.com/BCarley), [@chdsbd](https://github.com/chdsbd), [@tiangolo](https://github.com/tiangolo), [@matin](https://github.com/matin), [@linusg](https://github.com/linusg), [@kevinalh](https://github.com/kevinalh), [@koxudaxi](https://github.com/koxudaxi), [@timdrijvers](https://github.com/timdrijvers), [@mkeen](https://github.com/mkeen), [@meadsteve](https://github.com/meadsteve),
[@ginomempin](https://github.com/ginomempin), [@primer-io](https://github.com/primer-io), [@and-semakin](https://github.com/and-semakin), [@tomthorogood](https://github.com/tomthorogood), [@AjitZK](https://github.com/AjitZK), [@westonsteimel](https://github.com/westonsteimel), [@Mazyod](https://github.com/Mazyod), [@christippett](https://github.com/christippett), [@CarlosDomingues](https://github.com/CarlosDomingues),
[@Kludex](https://github.com/Kludex), [@r-m-n](https://github.com/r-m-n)
for their kind support.

### Highlights

* [Hypothesis plugin](https://docs.pydantic.dev/hypothesis_plugin/) for testing, [#2097](https://github.com/pydantic/pydantic/pull/2097) by [@Zac-HD](https://github.com/Zac-HD)
* support for [`NamedTuple` and `TypedDict`](https://docs.pydantic.dev/usage/types/#annotated-types), [#2216](https://github.com/pydantic/pydantic/pull/2216) by [@PrettyWood](https://github.com/PrettyWood)
* Support [`Annotated` hints on model fields](https://docs.pydantic.dev/usage/schema/#typingannotated-fields), [#2147](https://github.com/pydantic/pydantic/pull/2147) by [@JacobHayes](https://github.com/JacobHayes)
* [`frozen` parameter on `Config`](https://docs.pydantic.dev/usage/model_config/) to allow models to be hashed, [#1880](https://github.com/pydantic/pydantic/pull/1880) by [@rhuille](https://github.com/rhuille)

### Changes

* **Breaking Change**, remove old deprecation aliases from v1, [#2415](https://github.com/pydantic/pydantic/pull/2415) by [@samuelcolvin](https://github.com/samuelcolvin):
  * remove notes on migrating to v1 in docs
  * remove `Schema` which was replaced by `Field`
  * remove `Config.case_insensitive` which was replaced by `Config.case_sensitive` (default `False`)
  * remove `Config.allow_population_by_alias` which was replaced by `Config.allow_population_by_field_name`
  * remove `model.fields` which was replaced by `model.__fields__`
  * remove `model.to_string()` which was replaced by `str(model)`
  * remove `model.__values__` which was replaced by `model.__dict__`
* **Breaking Change:** always validate only first sublevel items with `each_item`.
  There were indeed some edge cases with some compound types where the validated items were the last sublevel ones, [#1933](https://github.com/pydantic/pydantic/pull/1933) by [@PrettyWood](https://github.com/PrettyWood)
* Update docs extensions to fix local syntax highlighting, [#2400](https://github.com/pydantic/pydantic/pull/2400) by [@daviskirk](https://github.com/daviskirk)
* fix: allow `utils.lenient_issubclass` to handle `typing.GenericAlias` objects like `list[str]` in Python >= 3.9, [#2399](https://github.com/pydantic/pydantic/pull/2399) by [@daviskirk](https://github.com/daviskirk)
* Improve field declaration for _pydantic_ `dataclass` by allowing the usage of _pydantic_ `Field` or `'metadata'` kwarg of `dataclasses.field`, [#2384](https://github.com/pydantic/pydantic/pull/2384) by [@PrettyWood](https://github.com/PrettyWood)
* Making `typing-extensions` a required dependency, [#2368](https://github.com/pydantic/pydantic/pull/2368) by [@samuelcolvin](https://github.com/samuelcolvin)
* Make `resolve_annotations` more lenient, allowing for missing modules, [#2363](https://github.com/pydantic/pydantic/pull/2363) by [@samuelcolvin](https://github.com/samuelcolvin)
* Allow configuring models through class kwargs, [#2356](https://github.com/pydantic/pydantic/pull/2356) by [@Bobronium](https://github.com/Bobronium)
* Prevent `Mapping` subclasses from always being coerced to `dict`, [#2325](https://github.com/pydantic/pydantic/pull/2325) by [@ofek](https://github.com/ofek)
* fix: allow `None` for type `Optional[conset / conlist]`, [#2320](https://github.com/pydantic/pydantic/pull/2320) by [@PrettyWood](https://github.com/PrettyWood)
* Support empty tuple type, [#2318](https://github.com/pydantic/pydantic/pull/2318) by [@PrettyWood](https://github.com/PrettyWood)
* fix: `python_requires` metadata to require >=3.6.1, [#2306](https://github.com/pydantic/pydantic/pull/2306) by [@hukkinj1](https://github.com/hukkinj1)
* Properly encode `Decimal` with, or without any decimal places, [#2293](https://github.com/pydantic/pydantic/pull/2293) by [@hultner](https://github.com/hultner)
* fix: update `__fields_set__` in `BaseModel.copy(update=…)`, [#2290](https://github.com/pydantic/pydantic/pull/2290) by [@PrettyWood](https://github.com/PrettyWood)
* fix: keep order of fields with `BaseModel.construct()`, [#2281](https://github.com/pydantic/pydantic/pull/2281) by [@PrettyWood](https://github.com/PrettyWood)
* Support generating schema for Generic fields, [#2262](https://github.com/pydantic/pydantic/pull/2262) by [@maximberg](https://github.com/maximberg)
* Fix `validate_decorator` so `**kwargs` doesn't exclude values when the keyword
  has the same name as the `*args` or `**kwargs` names, [#2251](https://github.com/pydantic/pydantic/pull/2251) by [@cybojenix](https://github.com/cybojenix)
* Prevent overriding positional arguments with keyword arguments in
  `validate_arguments`, as per behaviour with native functions, [#2249](https://github.com/pydantic/pydantic/pull/2249) by [@cybojenix](https://github.com/cybojenix)
* add documentation for `con*` type functions, [#2242](https://github.com/pydantic/pydantic/pull/2242) by [@tayoogunbiyi](https://github.com/tayoogunbiyi)
* Support custom root type (aka `__root__`) when using `parse_obj()` with nested models, [#2238](https://github.com/pydantic/pydantic/pull/2238) by [@PrettyWood](https://github.com/PrettyWood)
* Support custom root type (aka `__root__`) with `from_orm()`, [#2237](https://github.com/pydantic/pydantic/pull/2237) by [@PrettyWood](https://github.com/PrettyWood)
* ensure cythonized functions are left untouched when creating models, based on [#1944](https://github.com/pydantic/pydantic/pull/1944) by [@kollmats](https://github.com/kollmats), [#2228](https://github.com/pydantic/pydantic/pull/2228) by [@samuelcolvin](https://github.com/samuelcolvin)
* Resolve forward refs for stdlib dataclasses converted into _pydantic_ ones, [#2220](https://github.com/pydantic/pydantic/pull/2220) by [@PrettyWood](https://github.com/PrettyWood)
* Add support for `NamedTuple` and `TypedDict` types.
  Those two types are now handled and validated when used inside `BaseModel` or _pydantic_ `dataclass`.
  Two utils are also added `create_model_from_namedtuple` and `create_model_from_typeddict`, [#2216](https://github.com/pydantic/pydantic/pull/2216) by [@PrettyWood](https://github.com/PrettyWood)
* Do not ignore annotated fields when type is `Union[Type[...], ...]`, [#2213](https://github.com/pydantic/pydantic/pull/2213) by [@PrettyWood](https://github.com/PrettyWood)
* Raise a user-friendly `TypeError` when a `root_validator` does not return a `dict` (e.g. `None`), [#2209](https://github.com/pydantic/pydantic/pull/2209) by [@masalim2](https://github.com/masalim2)
* Add a `FrozenSet[str]` type annotation to the `allowed_schemes` argument on the `strict_url` field type, [#2198](https://github.com/pydantic/pydantic/pull/2198) by [@Midnighter](https://github.com/Midnighter)
* add `allow_mutation` constraint to `Field`, [#2195](https://github.com/pydantic/pydantic/pull/2195) by [@sblack-usu](https://github.com/sblack-usu)
* Allow `Field` with a `default_factory` to be used as an argument to a function
  decorated with `validate_arguments`, [#2176](https://github.com/pydantic/pydantic/pull/2176) by [@thomascobb](https://github.com/thomascobb)
* Allow non-existent secrets directory by only issuing a warning, [#2175](https://github.com/pydantic/pydantic/pull/2175) by [@davidolrik](https://github.com/davidolrik)
* fix URL regex to parse fragment without query string, [#2168](https://github.com/pydantic/pydantic/pull/2168) by [@andrewmwhite](https://github.com/andrewmwhite)
* fix: ensure to always return one of the values in `Literal` field type, [#2166](https://github.com/pydantic/pydantic/pull/2166) by [@PrettyWood](https://github.com/PrettyWood)
* Support `typing.Annotated` hints on model fields. A `Field` may now be set in the type hint with `Annotated[..., Field(...)`; all other annotations are ignored but still visible with `get_type_hints(..., include_extras=True)`, [#2147](https://github.com/pydantic/pydantic/pull/2147) by [@JacobHayes](https://github.com/JacobHayes)
* Added `StrictBytes` type as well as `strict=False` option to `ConstrainedBytes`, [#2136](https://github.com/pydantic/pydantic/pull/2136) by [@rlizzo](https://github.com/rlizzo)
* added `Config.anystr_lower` and `to_lower` kwarg to `constr` and `conbytes`, [#2134](https://github.com/pydantic/pydantic/pull/2134) by [@tayoogunbiyi](https://github.com/tayoogunbiyi)
* Support plain `typing.Tuple` type, [#2132](https://github.com/pydantic/pydantic/pull/2132) by [@PrettyWood](https://github.com/PrettyWood)
* Add a bound method `validate` to functions decorated with `validate_arguments`
  to validate parameters without actually calling the function, [#2127](https://github.com/pydantic/pydantic/pull/2127) by [@PrettyWood](https://github.com/PrettyWood)
* Add the ability to customize settings sources (add / disable / change priority order), [#2107](https://github.com/pydantic/pydantic/pull/2107) by [@kozlek](https://github.com/kozlek)
* Fix mypy complaints about most custom _pydantic_ types, [#2098](https://github.com/pydantic/pydantic/pull/2098) by [@PrettyWood](https://github.com/PrettyWood)
* Add a [Hypothesis](https://hypothesis.readthedocs.io/) plugin for easier [property-based testing](https://increment.com/testing/in-praise-of-property-based-testing/) with Pydantic's custom types - [usage details here](https://docs.pydantic.dev/hypothesis_plugin/), [#2097](https://github.com/pydantic/pydantic/pull/2097) by [@Zac-HD](https://github.com/Zac-HD)
* add validator for `None`, `NoneType` or `Literal[None]`, [#2095](https://github.com/pydantic/pydantic/pull/2095) by [@PrettyWood](https://github.com/PrettyWood)
* Handle properly fields of type `Callable` with a default value, [#2094](https://github.com/pydantic/pydantic/pull/2094) by [@PrettyWood](https://github.com/PrettyWood)
* Updated `create_model` return type annotation to return type which inherits from `__base__` argument, [#2071](https://github.com/pydantic/pydantic/pull/2071) by [@uriyyo](https://github.com/uriyyo)
* Add merged `json_encoders` inheritance, [#2064](https://github.com/pydantic/pydantic/pull/2064) by [@art049](https://github.com/art049)
* allow overwriting `ClassVar`s in sub-models without having to re-annotate them, [#2061](https://github.com/pydantic/pydantic/pull/2061) by [@layday](https://github.com/layday)
* add default encoder for `Pattern` type, [#2045](https://github.com/pydantic/pydantic/pull/2045) by [@PrettyWood](https://github.com/PrettyWood)
* Add `NonNegativeInt`, `NonPositiveInt`, `NonNegativeFloat`, `NonPositiveFloat`, [#1975](https://github.com/pydantic/pydantic/pull/1975) by [@mdavis-xyz](https://github.com/mdavis-xyz)
* Use % for percentage in string format of colors, [#1960](https://github.com/pydantic/pydantic/pull/1960) by [@EdwardBetts](https://github.com/EdwardBetts)
* Fixed issue causing `KeyError` to be raised when building schema from multiple `BaseModel` with the same names declared in separate classes, [#1912](https://github.com/pydantic/pydantic/pull/1912) by [@JSextonn](https://github.com/JSextonn)
* Add `rediss` (Redis over SSL) protocol to `RedisDsn`
  Allow URLs without `user` part (e.g., `rediss://:pass@localhost`), [#1911](https://github.com/pydantic/pydantic/pull/1911) by [@TrDex](https://github.com/TrDex)
* Add a new `frozen` boolean parameter to `Config` (default: `False`).
  Setting `frozen=True` does everything that `allow_mutation=False` does, and also generates a `__hash__()` method for the model. This makes instances of the model potentially hashable if all the attributes are hashable, [#1880](https://github.com/pydantic/pydantic/pull/1880) by [@rhuille](https://github.com/rhuille)
* fix schema generation with multiple Enums having the same name, [#1857](https://github.com/pydantic/pydantic/pull/1857) by [@PrettyWood](https://github.com/PrettyWood)
* Added support for 13/19 digits VISA credit cards in `PaymentCardNumber` type, [#1416](https://github.com/pydantic/pydantic/pull/1416) by [@AlexanderSov](https://github.com/AlexanderSov)
* fix: prevent `RecursionError` while using recursive `GenericModel`s, [#1370](https://github.com/pydantic/pydantic/pull/1370) by [@xppt](https://github.com/xppt)
* use `enum` for `typing.Literal` in JSON schema, [#1350](https://github.com/pydantic/pydantic/pull/1350) by [@PrettyWood](https://github.com/PrettyWood)
* Fix: some recursive models did not require `update_forward_refs` and silently behaved incorrectly, [#1201](https://github.com/pydantic/pydantic/pull/1201) by [@PrettyWood](https://github.com/PrettyWood)
* Fix bug where generic models with fields where the typevar is nested in another type `a: List[T]` are considered to be concrete. This allows these models to be subclassed and composed as expected, [#947](https://github.com/pydantic/pydantic/pull/947) by [@daviskirk](https://github.com/daviskirk)
* Add `Config.copy_on_model_validation` flag. When set to `False`, _pydantic_ will keep models used as fields
  untouched on validation instead of reconstructing (copying) them, [#265](https://github.com/pydantic/pydantic/pull/265) by [@PrettyWood](https://github.com/PrettyWood)

## v1.7.4 (2021-05-11)

* **Security fix:** Fix `date` and `datetime` parsing so passing either `'infinity'` or `float('inf')`
  (or their negative values) does not cause an infinite loop,
  See security advisory [CVE-2021-29510](https://github.com/pydantic/pydantic/security/advisories/GHSA-5jqp-qgf6-3pvh)

## v1.7.3 (2020-11-30)

Thank you to pydantic's sponsors:
[@timdrijvers](https://github.com/timdrijvers), [@BCarley](https://github.com/BCarley), [@chdsbd](https://github.com/chdsbd), [@tiangolo](https://github.com/tiangolo), [@matin](https://github.com/matin), [@linusg](https://github.com/linusg), [@kevinalh](https://github.com/kevinalh), [@jorgecarleitao](https://github.com/jorgecarleitao), [@koxudaxi](https://github.com/koxudaxi), [@primer-api](https://github.com/primer-api),
[@mkeen](https://github.com/mkeen), [@meadsteve](https://github.com/meadsteve) for their kind support.

* fix: set right default value for required (optional) fields, [#2142](https://github.com/pydantic/pydantic/pull/2142) by [@PrettyWood](https://github.com/PrettyWood)
* fix: support `underscore_attrs_are_private` with generic models, [#2138](https://github.com/pydantic/pydantic/pull/2138) by [@PrettyWood](https://github.com/PrettyWood)
* fix: update all modified field values in `root_validator` when `validate_assignment` is on, [#2116](https://github.com/pydantic/pydantic/pull/2116) by [@PrettyWood](https://github.com/PrettyWood)
* Allow pickling of `pydantic.dataclasses.dataclass` dynamically created from a built-in `dataclasses.dataclass`, [#2111](https://github.com/pydantic/pydantic/pull/2111) by [@aimestereo](https://github.com/aimestereo)
* Fix a regression where Enum fields would not propagate keyword arguments to the schema, [#2109](https://github.com/pydantic/pydantic/pull/2109) by [@bm424](https://github.com/bm424)
* Ignore `__doc__` as private attribute when `Config.underscore_attrs_are_private` is set, [#2090](https://github.com/pydantic/pydantic/pull/2090) by [@PrettyWood](https://github.com/PrettyWood)

## v1.7.2 (2020-11-01)

* fix slow `GenericModel` concrete model creation, allow `GenericModel` concrete name reusing in module, [#2078](https://github.com/pydantic/pydantic/pull/2078) by [@Bobronium](https://github.com/Bobronium)
* keep the order of the fields when `validate_assignment` is set, [#2073](https://github.com/pydantic/pydantic/pull/2073) by [@PrettyWood](https://github.com/PrettyWood)
* forward all the params of the stdlib `dataclass` when converted into _pydantic_ `dataclass`, [#2065](https://github.com/pydantic/pydantic/pull/2065) by [@PrettyWood](https://github.com/PrettyWood)

## v1.7.1 (2020-10-28)

Thank you to pydantic's sponsors:
[@timdrijvers](https://github.com/timdrijvers), [@BCarley](https://github.com/BCarley), [@chdsbd](https://github.com/chdsbd), [@tiangolo](https://github.com/tiangolo), [@matin](https://github.com/matin), [@linusg](https://github.com/linusg), [@kevinalh](https://github.com/kevinalh), [@jorgecarleitao](https://github.com/jorgecarleitao), [@koxudaxi](https://github.com/koxudaxi), [@primer-api](https://github.com/primer-api), [@mkeen](https://github.com/mkeen)
for their kind support.

* fix annotation of `validate_arguments` when passing configuration as argument, [#2055](https://github.com/pydantic/pydantic/pull/2055) by [@layday](https://github.com/layday)
* Fix mypy assignment error when using `PrivateAttr`, [#2048](https://github.com/pydantic/pydantic/pull/2048) by [@aphedges](https://github.com/aphedges)
* fix `underscore_attrs_are_private` causing `TypeError` when overriding `__init__`, [#2047](https://github.com/pydantic/pydantic/pull/2047) by [@samuelcolvin](https://github.com/samuelcolvin)
* Fixed regression introduced in v1.7 involving exception handling in field validators when `validate_assignment=True`, [#2044](https://github.com/pydantic/pydantic/pull/2044) by [@johnsabath](https://github.com/johnsabath)
* fix: _pydantic_ `dataclass` can inherit from stdlib `dataclass`
  and `Config.arbitrary_types_allowed` is supported, [#2042](https://github.com/pydantic/pydantic/pull/2042) by [@PrettyWood](https://github.com/PrettyWood)

## v1.7 (2020-10-26)

Thank you to pydantic's sponsors:
[@timdrijvers](https://github.com/timdrijvers), [@BCarley](https://github.com/BCarley), [@chdsbd](https://github.com/chdsbd), [@tiangolo](https://github.com/tiangolo), [@matin](https://github.com/matin), [@linusg](https://github.com/linusg), [@kevinalh](https://github.com/kevinalh), [@jorgecarleitao](https://github.com/jorgecarleitao), [@koxudaxi](https://github.com/koxudaxi), [@primer-api](https://github.com/primer-api)
for their kind support.

### Highlights

* Python 3.9 support, thanks [@PrettyWood](https://github.com/PrettyWood)
* [Private model attributes](https://docs.pydantic.dev/usage/models/#private-model-attributes), thanks [@Bobronium](https://github.com/Bobronium)
* ["secrets files" support in `BaseSettings`](https://docs.pydantic.dev/usage/settings/#secret-support), thanks [@mdgilene](https://github.com/mdgilene)
* [convert stdlib dataclasses to pydantic dataclasses and use stdlib dataclasses in models](https://docs.pydantic.dev/usage/dataclasses/#stdlib-dataclasses-and-pydantic-dataclasses), thanks [@PrettyWood](https://github.com/PrettyWood)

### Changes

* **Breaking Change:** remove `__field_defaults__`, add `default_factory` support with `BaseModel.construct`.
  Use `.get_default()` method on fields in `__fields__` attribute instead, [#1732](https://github.com/pydantic/pydantic/pull/1732) by [@PrettyWood](https://github.com/PrettyWood)
* Rearrange CI to run linting as a separate job, split install recipes for different tasks, [#2020](https://github.com/pydantic/pydantic/pull/2020) by [@samuelcolvin](https://github.com/samuelcolvin)
* Allows subclasses of generic models to make some, or all, of the superclass's type parameters concrete, while
  also defining new type parameters in the subclass, [#2005](https://github.com/pydantic/pydantic/pull/2005) by [@choogeboom](https://github.com/choogeboom)
* Call validator with the correct `values` parameter type in `BaseModel.__setattr__`,
  when `validate_assignment = True` in model config, [#1999](https://github.com/pydantic/pydantic/pull/1999) by [@me-ransh](https://github.com/me-ransh)
* Force `fields.Undefined` to be a singleton object, fixing inherited generic model schemas, [#1981](https://github.com/pydantic/pydantic/pull/1981) by [@daviskirk](https://github.com/daviskirk)
* Include tests in source distributions, [#1976](https://github.com/pydantic/pydantic/pull/1976) by [@sbraz](https://github.com/sbraz)
* Add ability to use `min_length/max_length` constraints with secret types, [#1974](https://github.com/pydantic/pydantic/pull/1974) by [@uriyyo](https://github.com/uriyyo)
* Also check `root_validators` when `validate_assignment` is on, [#1971](https://github.com/pydantic/pydantic/pull/1971) by [@PrettyWood](https://github.com/PrettyWood)
* Fix const validators not running when custom validators are present, [#1957](https://github.com/pydantic/pydantic/pull/1957) by [@hmvp](https://github.com/hmvp)
* add `deque` to field types, [#1935](https://github.com/pydantic/pydantic/pull/1935) by [@wozniakty](https://github.com/wozniakty)
* add basic support for Python 3.9, [#1832](https://github.com/pydantic/pydantic/pull/1832) by [@PrettyWood](https://github.com/PrettyWood)
* Fix typo in the anchor of exporting_models.md#modelcopy and incorrect description, [#1821](https://github.com/pydantic/pydantic/pull/1821) by [@KimMachineGun](https://github.com/KimMachineGun)
* Added ability for `BaseSettings` to read "secret files", [#1820](https://github.com/pydantic/pydantic/pull/1820) by [@mdgilene](https://github.com/mdgilene)
* add `parse_raw_as` utility function, [#1812](https://github.com/pydantic/pydantic/pull/1812) by [@PrettyWood](https://github.com/PrettyWood)
* Support home directory relative paths for `dotenv` files (e.g. `~/.env`), [#1803](https://github.com/pydantic/pydantic/pull/1803) by [@PrettyWood](https://github.com/PrettyWood)
* Clarify documentation for `parse_file` to show that the argument
  should be a file *path* not a file-like object, [#1794](https://github.com/pydantic/pydantic/pull/1794) by [@mdavis-xyz](https://github.com/mdavis-xyz)
* Fix false positive from mypy plugin when a class nested within a `BaseModel` is named `Model`, [#1770](https://github.com/pydantic/pydantic/pull/1770) by [@selimb](https://github.com/selimb)
* add basic support of Pattern type in schema generation, [#1767](https://github.com/pydantic/pydantic/pull/1767) by [@PrettyWood](https://github.com/PrettyWood)
* Support custom title, description and default in schema of enums, [#1748](https://github.com/pydantic/pydantic/pull/1748) by [@PrettyWood](https://github.com/PrettyWood)
* Properly represent `Literal` Enums when `use_enum_values` is True, [#1747](https://github.com/pydantic/pydantic/pull/1747) by [@noelevans](https://github.com/noelevans)
* Allows timezone information to be added to strings to be formatted as time objects. Permitted formats are `Z` for UTC
  or an offset for absolute positive or negative time shifts. Or the timezone data can be omitted, [#1744](https://github.com/pydantic/pydantic/pull/1744) by [@noelevans](https://github.com/noelevans)
* Add stub `__init__` with Python 3.6 signature for `ForwardRef`, [#1738](https://github.com/pydantic/pydantic/pull/1738) by [@sirtelemak](https://github.com/sirtelemak)
* Fix behaviour with forward refs and optional fields in nested models, [#1736](https://github.com/pydantic/pydantic/pull/1736) by [@PrettyWood](https://github.com/PrettyWood)
* add `Enum` and `IntEnum` as valid types for fields, [#1735](https://github.com/pydantic/pydantic/pull/1735) by [@PrettyWood](https://github.com/PrettyWood)
* Change default value of `__module__` argument of `create_model` from `None` to `'pydantic.main'`.
  Set reference of created concrete model to it's module to allow pickling (not applied to models created in
  functions), [#1686](https://github.com/pydantic/pydantic/pull/1686) by [@Bobronium](https://github.com/Bobronium)
* Add private attributes support, [#1679](https://github.com/pydantic/pydantic/pull/1679) by [@Bobronium](https://github.com/Bobronium)
* add `config` to `@validate_arguments`, [#1663](https://github.com/pydantic/pydantic/pull/1663) by [@samuelcolvin](https://github.com/samuelcolvin)
* Allow descendant Settings models to override env variable names for the fields defined in parent Settings models with
  `env` in their `Config`. Previously only `env_prefix` configuration option was applicable, [#1561](https://github.com/pydantic/pydantic/pull/1561) by [@ojomio](https://github.com/ojomio)
* Support `ref_template` when creating schema `$ref`s, [#1479](https://github.com/pydantic/pydantic/pull/1479) by [@kilo59](https://github.com/kilo59)
* Add a `__call__` stub to `PyObject` so that mypy will know that it is callable, [#1352](https://github.com/pydantic/pydantic/pull/1352) by [@brianmaissy](https://github.com/brianmaissy)
* `pydantic.dataclasses.dataclass` decorator now supports built-in `dataclasses.dataclass`.
  It is hence possible to convert an existing `dataclass` easily to add Pydantic validation.
  Moreover nested dataclasses are also supported, [#744](https://github.com/pydantic/pydantic/pull/744) by [@PrettyWood](https://github.com/PrettyWood)

## v1.6.2 (2021-05-11)

* **Security fix:** Fix `date` and `datetime` parsing so passing either `'infinity'` or `float('inf')`
  (or their negative values) does not cause an infinite loop,
  See security advisory [CVE-2021-29510](https://github.com/pydantic/pydantic/security/advisories/GHSA-5jqp-qgf6-3pvh)

## v1.6.1 (2020-07-15)

* fix validation and parsing of nested models with `default_factory`, [#1710](https://github.com/pydantic/pydantic/pull/1710) by [@PrettyWood](https://github.com/PrettyWood)

## v1.6 (2020-07-11)

Thank you to pydantic's sponsors: [@matin](https://github.com/matin), [@tiangolo](https://github.com/tiangolo), [@chdsbd](https://github.com/chdsbd), [@jorgecarleitao](https://github.com/jorgecarleitao), and 1 anonymous sponsor for their kind support.

* Modify validators for `conlist` and `conset` to not have `always=True`, [#1682](https://github.com/pydantic/pydantic/pull/1682) by [@samuelcolvin](https://github.com/samuelcolvin)
* add port check to `AnyUrl` (can't exceed 65536) ports are 16 insigned bits: `0 <= port <= 2**16-1` src: [rfc793 header format](https://tools.ietf.org/html/rfc793#section-3.1), [#1654](https://github.com/pydantic/pydantic/pull/1654) by [@flapili](https://github.com/flapili)
* Document default `regex` anchoring semantics, [#1648](https://github.com/pydantic/pydantic/pull/1648) by [@yurikhan](https://github.com/yurikhan)
* Use `chain.from_iterable` in class_validators.py. This is a faster and more idiomatic way of using `itertools.chain`.
  Instead of computing all the items in the iterable and storing them in memory, they are computed one-by-one and never
  stored as a huge list. This can save on both runtime and memory space, [#1642](https://github.com/pydantic/pydantic/pull/1642) by [@cool-RR](https://github.com/cool-RR)
* Add `conset()`, analogous to `conlist()`, [#1623](https://github.com/pydantic/pydantic/pull/1623) by [@patrickkwang](https://github.com/patrickkwang)
* make Pydantic errors (un)pickable, [#1616](https://github.com/pydantic/pydantic/pull/1616) by [@PrettyWood](https://github.com/PrettyWood)
* Allow custom encoding for `dotenv` files, [#1615](https://github.com/pydantic/pydantic/pull/1615) by [@PrettyWood](https://github.com/PrettyWood)
* Ensure `SchemaExtraCallable` is always defined to get type hints on BaseConfig, [#1614](https://github.com/pydantic/pydantic/pull/1614) by [@PrettyWood](https://github.com/PrettyWood)
* Update datetime parser to support negative timestamps, [#1600](https://github.com/pydantic/pydantic/pull/1600) by [@mlbiche](https://github.com/mlbiche)
* Update mypy, remove `AnyType` alias for `Type[Any]`, [#1598](https://github.com/pydantic/pydantic/pull/1598) by [@samuelcolvin](https://github.com/samuelcolvin)
* Adjust handling of root validators so that errors are aggregated from _all_ failing root validators, instead of reporting on only the first root validator to fail, [#1586](https://github.com/pydantic/pydantic/pull/1586) by [@beezee](https://github.com/beezee)
* Make `__modify_schema__` on Enums apply to the enum schema rather than fields that use the enum, [#1581](https://github.com/pydantic/pydantic/pull/1581) by [@therefromhere](https://github.com/therefromhere)
* Fix behavior of `__all__` key when used in conjunction with index keys in advanced include/exclude of fields that are sequences, [#1579](https://github.com/pydantic/pydantic/pull/1579) by [@xspirus](https://github.com/xspirus)
* Subclass validators do not run when referencing a `List` field defined in a parent class when `each_item=True`. Added an example to the docs illustrating this, [#1566](https://github.com/pydantic/pydantic/pull/1566) by [@samueldeklund](https://github.com/samueldeklund)
* change `schema.field_class_to_schema` to support `frozenset` in schema, [#1557](https://github.com/pydantic/pydantic/pull/1557) by [@wangpeibao](https://github.com/wangpeibao)
* Call `__modify_schema__` only for the field schema, [#1552](https://github.com/pydantic/pydantic/pull/1552) by [@PrettyWood](https://github.com/PrettyWood)
* Move the assignment of `field.validate_always` in `fields.py` so the `always` parameter of validators work on inheritance, [#1545](https://github.com/pydantic/pydantic/pull/1545) by [@dcHHH](https://github.com/dcHHH)
* Added support for UUID instantiation through 16 byte strings such as `b'\x12\x34\x56\x78' * 4`. This was done to support `BINARY(16)` columns in sqlalchemy, [#1541](https://github.com/pydantic/pydantic/pull/1541) by [@shawnwall](https://github.com/shawnwall)
* Add a test assertion that `default_factory` can return a singleton, [#1523](https://github.com/pydantic/pydantic/pull/1523) by [@therefromhere](https://github.com/therefromhere)
* Add `NameEmail.__eq__` so duplicate `NameEmail` instances are evaluated as equal, [#1514](https://github.com/pydantic/pydantic/pull/1514) by [@stephen-bunn](https://github.com/stephen-bunn)
* Add datamodel-code-generator link in pydantic document site, [#1500](https://github.com/pydantic/pydantic/pull/1500) by [@koxudaxi](https://github.com/koxudaxi)
* Added a "Discussion of Pydantic" section to the documentation, with a link to "Pydantic Introduction" video by Alexander Hultnér, [#1499](https://github.com/pydantic/pydantic/pull/1499) by [@hultner](https://github.com/hultner)
* Avoid some side effects of `default_factory` by calling it only once
  if possible and by not setting a default value in the schema, [#1491](https://github.com/pydantic/pydantic/pull/1491) by [@PrettyWood](https://github.com/PrettyWood)
* Added docs about dumping dataclasses to JSON, [#1487](https://github.com/pydantic/pydantic/pull/1487) by [@mikegrima](https://github.com/mikegrima)
* Make `BaseModel.__signature__` class-only, so getting `__signature__` from model instance will raise `AttributeError`, [#1466](https://github.com/pydantic/pydantic/pull/1466) by [@Bobronium](https://github.com/Bobronium)
* include `'format': 'password'` in the schema for secret types, [#1424](https://github.com/pydantic/pydantic/pull/1424) by [@atheuz](https://github.com/atheuz)
* Modify schema constraints on `ConstrainedFloat` so that `exclusiveMinimum` and
  minimum are not included in the schema if they are equal to `-math.inf` and
  `exclusiveMaximum` and `maximum` are not included if they are equal to `math.inf`, [#1417](https://github.com/pydantic/pydantic/pull/1417) by [@vdwees](https://github.com/vdwees)
* Squash internal `__root__` dicts in `.dict()` (and, by extension, in `.json()`), [#1414](https://github.com/pydantic/pydantic/pull/1414) by [@patrickkwang](https://github.com/patrickkwang)
* Move `const` validator to post-validators so it validates the parsed value, [#1410](https://github.com/pydantic/pydantic/pull/1410) by [@selimb](https://github.com/selimb)
* Fix model validation to handle nested literals, e.g. `Literal['foo', Literal['bar']]`, [#1364](https://github.com/pydantic/pydantic/pull/1364) by [@DBCerigo](https://github.com/DBCerigo)
* Remove `user_required = True` from `RedisDsn`, neither user nor password are required, [#1275](https://github.com/pydantic/pydantic/pull/1275) by [@samuelcolvin](https://github.com/samuelcolvin)
* Remove extra `allOf` from schema for fields with `Union` and custom `Field`, [#1209](https://github.com/pydantic/pydantic/pull/1209) by [@mostaphaRoudsari](https://github.com/mostaphaRoudsari)
* Updates OpenAPI schema generation to output all enums as separate models.
  Instead of inlining the enum values in the model schema, models now use a `$ref`
  property to point to the enum definition, [#1173](https://github.com/pydantic/pydantic/pull/1173) by [@calvinwyoung](https://github.com/calvinwyoung)

## v1.5.1 (2020-04-23)

* Signature generation with `extra: allow` never uses a field name, [#1418](https://github.com/pydantic/pydantic/pull/1418) by [@prettywood](https://github.com/prettywood)
* Avoid mutating `Field` default value, [#1412](https://github.com/pydantic/pydantic/pull/1412) by [@prettywood](https://github.com/prettywood)

## v1.5 (2020-04-18)

* Make includes/excludes arguments for `.dict()`, `._iter()`, ..., immutable, [#1404](https://github.com/pydantic/pydantic/pull/1404) by [@AlexECX](https://github.com/AlexECX)
* Always use a field's real name with includes/excludes in `model._iter()`, regardless of `by_alias`, [#1397](https://github.com/pydantic/pydantic/pull/1397) by [@AlexECX](https://github.com/AlexECX)
* Update constr regex example to include start and end lines, [#1396](https://github.com/pydantic/pydantic/pull/1396) by [@lmcnearney](https://github.com/lmcnearney)
* Confirm that shallow `model.copy()` does make a shallow copy of attributes, [#1383](https://github.com/pydantic/pydantic/pull/1383) by [@samuelcolvin](https://github.com/samuelcolvin)
* Renaming `model_name` argument of `main.create_model()` to `__model_name` to allow using `model_name` as a field name, [#1367](https://github.com/pydantic/pydantic/pull/1367) by [@kittipatv](https://github.com/kittipatv)
* Replace raising of exception to silent passing  for non-Var attributes in mypy plugin, [#1345](https://github.com/pydantic/pydantic/pull/1345) by [@b0g3r](https://github.com/b0g3r)
* Remove `typing_extensions` dependency for Python 3.8, [#1342](https://github.com/pydantic/pydantic/pull/1342) by [@prettywood](https://github.com/prettywood)
* Make `SecretStr` and `SecretBytes` initialization idempotent, [#1330](https://github.com/pydantic/pydantic/pull/1330) by [@atheuz](https://github.com/atheuz)
* document making secret types dumpable using the json method, [#1328](https://github.com/pydantic/pydantic/pull/1328) by [@atheuz](https://github.com/atheuz)
* Move all testing and build to github actions, add windows and macos binaries,
  thank you [@StephenBrown2](https://github.com/StephenBrown2) for much help, [#1326](https://github.com/pydantic/pydantic/pull/1326) by [@samuelcolvin](https://github.com/samuelcolvin)
* fix card number length check in `PaymentCardNumber`, `PaymentCardBrand` now inherits from `str`, [#1317](https://github.com/pydantic/pydantic/pull/1317) by [@samuelcolvin](https://github.com/samuelcolvin)
* Have `BaseModel` inherit from `Representation` to make mypy happy when overriding `__str__`, [#1310](https://github.com/pydantic/pydantic/pull/1310) by [@FuegoFro](https://github.com/FuegoFro)
* Allow `None` as input to all optional list fields, [#1307](https://github.com/pydantic/pydantic/pull/1307) by [@prettywood](https://github.com/prettywood)
* Add `datetime` field to `default_factory` example, [#1301](https://github.com/pydantic/pydantic/pull/1301) by [@StephenBrown2](https://github.com/StephenBrown2)
* Allow subclasses of known types to be encoded with superclass encoder, [#1291](https://github.com/pydantic/pydantic/pull/1291) by [@StephenBrown2](https://github.com/StephenBrown2)
* Exclude exported fields from all elements of a list/tuple of submodels/dicts with `'__all__'`, [#1286](https://github.com/pydantic/pydantic/pull/1286) by [@masalim2](https://github.com/masalim2)
* Add pydantic.color.Color objects as available input for Color fields, [#1258](https://github.com/pydantic/pydantic/pull/1258) by [@leosussan](https://github.com/leosussan)
* In examples, type nullable fields as `Optional`, so that these are valid mypy annotations, [#1248](https://github.com/pydantic/pydantic/pull/1248) by [@kokes](https://github.com/kokes)
* Make `pattern_validator()` accept pre-compiled `Pattern` objects. Fix `str_validator()` return type to `str`, [#1237](https://github.com/pydantic/pydantic/pull/1237) by [@adamgreg](https://github.com/adamgreg)
* Document how to manage Generics and inheritance, [#1229](https://github.com/pydantic/pydantic/pull/1229) by [@esadruhn](https://github.com/esadruhn)
* `update_forward_refs()` method of BaseModel now copies `__dict__` of class module instead of modyfying it, [#1228](https://github.com/pydantic/pydantic/pull/1228) by [@paul-ilyin](https://github.com/paul-ilyin)
* Support instance methods and class methods with `@validate_arguments`, [#1222](https://github.com/pydantic/pydantic/pull/1222) by [@samuelcolvin](https://github.com/samuelcolvin)
* Add `default_factory` argument to `Field` to create a dynamic default value by passing a zero-argument callable, [#1210](https://github.com/pydantic/pydantic/pull/1210) by [@prettywood](https://github.com/prettywood)
* add support for `NewType` of `List`, `Optional`, etc, [#1207](https://github.com/pydantic/pydantic/pull/1207) by [@Kazy](https://github.com/Kazy)
* fix mypy signature for `root_validator`, [#1192](https://github.com/pydantic/pydantic/pull/1192) by [@samuelcolvin](https://github.com/samuelcolvin)
* Fixed parsing of nested 'custom root type' models, [#1190](https://github.com/pydantic/pydantic/pull/1190) by [@Shados](https://github.com/Shados)
* Add `validate_arguments` function decorator which checks the arguments to a function matches type annotations, [#1179](https://github.com/pydantic/pydantic/pull/1179) by [@samuelcolvin](https://github.com/samuelcolvin)
* Add `__signature__` to models, [#1034](https://github.com/pydantic/pydantic/pull/1034) by [@Bobronium](https://github.com/Bobronium)
* Refactor `._iter()` method, 10x speed boost for `dict(model)`, [#1017](https://github.com/pydantic/pydantic/pull/1017) by [@Bobronium](https://github.com/Bobronium)

## v1.4 (2020-01-24)

* **Breaking Change:** alias precedence logic changed so aliases on a field always take priority over
  an alias from `alias_generator` to avoid buggy/unexpected behaviour,
  see [here](https://docs.pydantic.dev/usage/model_config/#alias-precedence) for details, [#1178](https://github.com/pydantic/pydantic/pull/1178) by [@samuelcolvin](https://github.com/samuelcolvin)
* Add support for unicode and punycode in TLDs, [#1182](https://github.com/pydantic/pydantic/pull/1182) by [@jamescurtin](https://github.com/jamescurtin)
* Fix `cls` argument in validators during assignment, [#1172](https://github.com/pydantic/pydantic/pull/1172) by [@samuelcolvin](https://github.com/samuelcolvin)
* completing Luhn algorithm for `PaymentCardNumber`, [#1166](https://github.com/pydantic/pydantic/pull/1166) by [@cuencandres](https://github.com/cuencandres)
* add support for generics that implement `__get_validators__` like a custom data type, [#1159](https://github.com/pydantic/pydantic/pull/1159) by [@tiangolo](https://github.com/tiangolo)
* add support for infinite generators with `Iterable`, [#1152](https://github.com/pydantic/pydantic/pull/1152) by [@tiangolo](https://github.com/tiangolo)
* fix `url_regex` to accept schemas with `+`, `-` and `.` after the first character, [#1142](https://github.com/pydantic/pydantic/pull/1142) by [@samuelcolvin](https://github.com/samuelcolvin)
* move `version_info()` to `version.py`, suggest its use in issues, [#1138](https://github.com/pydantic/pydantic/pull/1138) by [@samuelcolvin](https://github.com/samuelcolvin)
* Improve pydantic import time by roughly 50% by deferring some module loading and regex compilation, [#1127](https://github.com/pydantic/pydantic/pull/1127) by [@samuelcolvin](https://github.com/samuelcolvin)
* Fix `EmailStr` and `NameEmail` to accept instances of themselves in cython, [#1126](https://github.com/pydantic/pydantic/pull/1126) by [@koxudaxi](https://github.com/koxudaxi)
* Pass model class to the `Config.schema_extra` callable, [#1125](https://github.com/pydantic/pydantic/pull/1125) by [@therefromhere](https://github.com/therefromhere)
* Fix regex for username and password in URLs, [#1115](https://github.com/pydantic/pydantic/pull/1115) by [@samuelcolvin](https://github.com/samuelcolvin)
* Add support for nested generic models, [#1104](https://github.com/pydantic/pydantic/pull/1104) by [@dmontagu](https://github.com/dmontagu)
* add `__all__` to `__init__.py` to prevent "implicit reexport" errors from mypy, [#1072](https://github.com/pydantic/pydantic/pull/1072) by [@samuelcolvin](https://github.com/samuelcolvin)
* Add support for using "dotenv" files with `BaseSettings`, [#1011](https://github.com/pydantic/pydantic/pull/1011) by [@acnebs](https://github.com/acnebs)

## v1.3 (2019-12-21)

* Change `schema` and `schema_model` to handle dataclasses by using their `__pydantic_model__` feature, [#792](https://github.com/pydantic/pydantic/pull/792) by [@aviramha](https://github.com/aviramha)
* Added option for `root_validator` to be skipped if values validation fails using keyword `skip_on_failure=True`, [#1049](https://github.com/pydantic/pydantic/pull/1049) by [@aviramha](https://github.com/aviramha)
* Allow `Config.schema_extra` to be a callable so that the generated schema can be post-processed, [#1054](https://github.com/pydantic/pydantic/pull/1054) by [@selimb](https://github.com/selimb)
* Update mypy to version 0.750, [#1057](https://github.com/pydantic/pydantic/pull/1057) by [@dmontagu](https://github.com/dmontagu)
* Trick Cython into allowing str subclassing, [#1061](https://github.com/pydantic/pydantic/pull/1061) by [@skewty](https://github.com/skewty)
* Prevent type attributes being added to schema unless the attribute `__schema_attributes__` is `True`, [#1064](https://github.com/pydantic/pydantic/pull/1064) by [@samuelcolvin](https://github.com/samuelcolvin)
* Change `BaseModel.parse_file` to use `Config.json_loads`, [#1067](https://github.com/pydantic/pydantic/pull/1067) by [@kierandarcy](https://github.com/kierandarcy)
* Fix for optional `Json` fields, [#1073](https://github.com/pydantic/pydantic/pull/1073) by [@volker48](https://github.com/volker48)
* Change the default number of threads used when compiling with cython to one,
  allow override via the `CYTHON_NTHREADS` environment variable, [#1074](https://github.com/pydantic/pydantic/pull/1074) by [@samuelcolvin](https://github.com/samuelcolvin)
* Run FastAPI tests during Pydantic's CI tests, [#1075](https://github.com/pydantic/pydantic/pull/1075) by [@tiangolo](https://github.com/tiangolo)
* My mypy strictness constraints, and associated tweaks to type annotations, [#1077](https://github.com/pydantic/pydantic/pull/1077) by [@samuelcolvin](https://github.com/samuelcolvin)
* Add `__eq__` to SecretStr and SecretBytes to allow "value equals", [#1079](https://github.com/pydantic/pydantic/pull/1079) by [@sbv-trueenergy](https://github.com/sbv-trueenergy)
* Fix schema generation for nested None case, [#1088](https://github.com/pydantic/pydantic/pull/1088) by [@lutostag](https://github.com/lutostag)
* Consistent checks for sequence like objects, [#1090](https://github.com/pydantic/pydantic/pull/1090) by [@samuelcolvin](https://github.com/samuelcolvin)
* Fix `Config` inheritance on `BaseSettings` when used with `env_prefix`, [#1091](https://github.com/pydantic/pydantic/pull/1091) by [@samuelcolvin](https://github.com/samuelcolvin)
* Fix for `__modify_schema__` when it conflicted with `field_class_to_schema*`, [#1102](https://github.com/pydantic/pydantic/pull/1102) by [@samuelcolvin](https://github.com/samuelcolvin)
* docs: Fix explanation of case sensitive environment variable names when populating `BaseSettings` subclass attributes, [#1105](https://github.com/pydantic/pydantic/pull/1105) by [@tribals](https://github.com/tribals)
* Rename django-rest-framework benchmark in documentation, [#1119](https://github.com/pydantic/pydantic/pull/1119) by [@frankie567](https://github.com/frankie567)

## v1.2 (2019-11-28)

* **Possible Breaking Change:** Add support for required `Optional` with `name: Optional[AnyType] = Field(...)`
  and refactor `ModelField` creation to preserve `required` parameter value, [#1031](https://github.com/pydantic/pydantic/pull/1031) by [@tiangolo](https://github.com/tiangolo);
  see [here](https://docs.pydantic.dev/usage/models/#required-optional-fields) for details
* Add benchmarks for `cattrs`, [#513](https://github.com/pydantic/pydantic/pull/513) by [@sebastianmika](https://github.com/sebastianmika)
* Add `exclude_none` option to `dict()` and friends, [#587](https://github.com/pydantic/pydantic/pull/587) by [@niknetniko](https://github.com/niknetniko)
* Add benchmarks for `valideer`, [#670](https://github.com/pydantic/pydantic/pull/670) by [@gsakkis](https://github.com/gsakkis)
* Add `parse_obj_as` and `parse_file_as` functions for ad-hoc parsing of data into arbitrary pydantic-compatible types, [#934](https://github.com/pydantic/pydantic/pull/934) by [@dmontagu](https://github.com/dmontagu)
* Add `allow_reuse` argument to validators, thus allowing validator reuse, [#940](https://github.com/pydantic/pydantic/pull/940) by [@dmontagu](https://github.com/dmontagu)
* Add support for mapping types for custom root models, [#958](https://github.com/pydantic/pydantic/pull/958) by [@dmontagu](https://github.com/dmontagu)
* Mypy plugin support for dataclasses, [#966](https://github.com/pydantic/pydantic/pull/966) by [@koxudaxi](https://github.com/koxudaxi)
* Add support for dataclasses default factory, [#968](https://github.com/pydantic/pydantic/pull/968) by [@ahirner](https://github.com/ahirner)
* Add a `ByteSize` type for converting byte string (`1GB`) to plain bytes, [#977](https://github.com/pydantic/pydantic/pull/977) by [@dgasmith](https://github.com/dgasmith)
* Fix mypy complaint about `@root_validator(pre=True)`, [#984](https://github.com/pydantic/pydantic/pull/984) by [@samuelcolvin](https://github.com/samuelcolvin)
* Add manylinux binaries for Python 3.8 to pypi, also support manylinux2010, [#994](https://github.com/pydantic/pydantic/pull/994) by [@samuelcolvin](https://github.com/samuelcolvin)
* Adds ByteSize conversion to another unit, [#995](https://github.com/pydantic/pydantic/pull/995) by [@dgasmith](https://github.com/dgasmith)
* Fix `__str__` and `__repr__` inheritance for models, [#1022](https://github.com/pydantic/pydantic/pull/1022) by [@samuelcolvin](https://github.com/samuelcolvin)
* add testimonials section to docs, [#1025](https://github.com/pydantic/pydantic/pull/1025) by [@sullivancolin](https://github.com/sullivancolin)
* Add support for `typing.Literal` for Python 3.8, [#1026](https://github.com/pydantic/pydantic/pull/1026) by [@dmontagu](https://github.com/dmontagu)

## v1.1.1 (2019-11-20)

* Fix bug where use of complex fields on sub-models could cause fields to be incorrectly configured, [#1015](https://github.com/pydantic/pydantic/pull/1015) by [@samuelcolvin](https://github.com/samuelcolvin)

## v1.1 (2019-11-07)

* Add a mypy plugin for type checking `BaseModel.__init__` and more, [#722](https://github.com/pydantic/pydantic/pull/722) by [@dmontagu](https://github.com/dmontagu)
* Change return type typehint for `GenericModel.__class_getitem__` to prevent PyCharm warnings, [#936](https://github.com/pydantic/pydantic/pull/936) by [@dmontagu](https://github.com/dmontagu)
* Fix usage of `Any` to allow `None`, also support `TypeVar` thus allowing use of un-parameterised collection types
  e.g. `Dict` and `List`, [#962](https://github.com/pydantic/pydantic/pull/962) by [@samuelcolvin](https://github.com/samuelcolvin)
* Set `FieldInfo` on subfields to fix schema generation for complex nested types, [#965](https://github.com/pydantic/pydantic/pull/965) by [@samuelcolvin](https://github.com/samuelcolvin)

## v1.0 (2019-10-23)

* **Breaking Change:** deprecate the `Model.fields` property, use `Model.__fields__` instead, [#883](https://github.com/pydantic/pydantic/pull/883) by [@samuelcolvin](https://github.com/samuelcolvin)
* **Breaking Change:** Change the precedence of aliases so child model aliases override parent aliases,
  including using `alias_generator`, [#904](https://github.com/pydantic/pydantic/pull/904) by [@samuelcolvin](https://github.com/samuelcolvin)
* **Breaking change:** Rename `skip_defaults` to `exclude_unset`, and add ability to exclude actual defaults, [#915](https://github.com/pydantic/pydantic/pull/915) by [@dmontagu](https://github.com/dmontagu)
* Add `**kwargs` to `pydantic.main.ModelMetaclass.__new__` so `__init_subclass__` can take custom parameters on extended
  `BaseModel` classes, [#867](https://github.com/pydantic/pydantic/pull/867) by [@retnikt](https://github.com/retnikt)
* Fix field of a type that has a default value, [#880](https://github.com/pydantic/pydantic/pull/880) by [@koxudaxi](https://github.com/koxudaxi)
* Use `FutureWarning` instead of `DeprecationWarning` when `alias` instead of `env` is used for settings models, [#881](https://github.com/pydantic/pydantic/pull/881) by [@samuelcolvin](https://github.com/samuelcolvin)
* Fix issue with `BaseSettings` inheritance and `alias` getting set to `None`, [#882](https://github.com/pydantic/pydantic/pull/882) by [@samuelcolvin](https://github.com/samuelcolvin)
* Modify `__repr__` and `__str__` methods to be consistent across all public classes, add `__pretty__` to support
  python-devtools, [#884](https://github.com/pydantic/pydantic/pull/884) by [@samuelcolvin](https://github.com/samuelcolvin)
* deprecation warning for `case_insensitive` on `BaseSettings` config, [#885](https://github.com/pydantic/pydantic/pull/885) by [@samuelcolvin](https://github.com/samuelcolvin)
* For `BaseSettings` merge environment variables and in-code values recursively, as long as they create a valid object
  when merged together, to allow splitting init arguments, [#888](https://github.com/pydantic/pydantic/pull/888) by [@idmitrievsky](https://github.com/idmitrievsky)
* change secret types example, [#890](https://github.com/pydantic/pydantic/pull/890) by [@ashears](https://github.com/ashears)
* Change the signature of `Model.construct()` to be more user-friendly, document `construct()` usage, [#898](https://github.com/pydantic/pydantic/pull/898) by [@samuelcolvin](https://github.com/samuelcolvin)
* Add example for the `construct()` method, [#907](https://github.com/pydantic/pydantic/pull/907) by [@ashears](https://github.com/ashears)
* Improve use of `Field` constraints on complex types, raise an error if constraints are not enforceable,
  also support tuples with an ellipsis `Tuple[X, ...]`, `Sequence` and `FrozenSet` in schema, [#909](https://github.com/pydantic/pydantic/pull/909) by [@samuelcolvin](https://github.com/samuelcolvin)
* update docs for bool missing valid value, [#911](https://github.com/pydantic/pydantic/pull/911) by [@trim21](https://github.com/trim21)
* Better `str`/`repr` logic for `ModelField`, [#912](https://github.com/pydantic/pydantic/pull/912) by [@samuelcolvin](https://github.com/samuelcolvin)
* Fix `ConstrainedList`, update schema generation to reflect `min_items` and `max_items` `Field()` arguments, [#917](https://github.com/pydantic/pydantic/pull/917) by [@samuelcolvin](https://github.com/samuelcolvin)
* Allow abstracts sets (eg. dict keys) in the `include` and `exclude` arguments of `dict()`, [#921](https://github.com/pydantic/pydantic/pull/921) by [@samuelcolvin](https://github.com/samuelcolvin)
* Fix JSON serialization errors on `ValidationError.json()` by using `pydantic_encoder`, [#922](https://github.com/pydantic/pydantic/pull/922) by [@samuelcolvin](https://github.com/samuelcolvin)
* Clarify usage of `remove_untouched`, improve error message for types with no validators, [#926](https://github.com/pydantic/pydantic/pull/926) by [@retnikt](https://github.com/retnikt)

## v1.0b2 (2019-10-07)

* Mark `StrictBool` typecheck as `bool` to allow for default values without mypy errors, [#690](https://github.com/pydantic/pydantic/pull/690) by [@dmontagu](https://github.com/dmontagu)
* Transfer the documentation build from sphinx to mkdocs, re-write much of the documentation, [#856](https://github.com/pydantic/pydantic/pull/856) by [@samuelcolvin](https://github.com/samuelcolvin)
* Add support for custom naming schemes for `GenericModel` subclasses, [#859](https://github.com/pydantic/pydantic/pull/859) by [@dmontagu](https://github.com/dmontagu)
* Add `if TYPE_CHECKING:` to the excluded lines for test coverage, [#874](https://github.com/pydantic/pydantic/pull/874) by [@dmontagu](https://github.com/dmontagu)
* Rename `allow_population_by_alias` to `allow_population_by_field_name`, remove unnecessary warning about it, [#875](https://github.com/pydantic/pydantic/pull/875) by [@samuelcolvin](https://github.com/samuelcolvin)

## v1.0b1 (2019-10-01)

* **Breaking Change:** rename `Schema` to `Field`, make it a function to placate mypy, [#577](https://github.com/pydantic/pydantic/pull/577) by [@samuelcolvin](https://github.com/samuelcolvin)
* **Breaking Change:** modify parsing behavior for `bool`, [#617](https://github.com/pydantic/pydantic/pull/617) by [@dmontagu](https://github.com/dmontagu)
* **Breaking Change:** `get_validators` is no longer recognised, use `__get_validators__`.
  `Config.ignore_extra` and `Config.allow_extra` are no longer recognised, use `Config.extra`, [#720](https://github.com/pydantic/pydantic/pull/720) by [@samuelcolvin](https://github.com/samuelcolvin)
* **Breaking Change:** modify default config settings for `BaseSettings`; `case_insensitive` renamed to `case_sensitive`,
  default changed to `case_sensitive = False`, `env_prefix` default changed to `''` - e.g. no prefix, [#721](https://github.com/pydantic/pydantic/pull/721) by [@dmontagu](https://github.com/dmontagu)
* **Breaking change:** Implement `root_validator` and rename root errors from `__obj__` to `__root__`, [#729](https://github.com/pydantic/pydantic/pull/729) by [@samuelcolvin](https://github.com/samuelcolvin)
* **Breaking Change:** alter the behaviour of `dict(model)` so that sub-models are nolonger
  converted to dictionaries, [#733](https://github.com/pydantic/pydantic/pull/733) by [@samuelcolvin](https://github.com/samuelcolvin)
* **Breaking change:** Added `initvars` support to `post_init_post_parse`, [#748](https://github.com/pydantic/pydantic/pull/748) by [@Raphael-C-Almeida](https://github.com/Raphael-C-Almeida)
* **Breaking Change:** Make `BaseModel.json()` only serialize the `__root__` key for models with custom root, [#752](https://github.com/pydantic/pydantic/pull/752) by [@dmontagu](https://github.com/dmontagu)
* **Breaking Change:** complete rewrite of `URL` parsing logic, [#755](https://github.com/pydantic/pydantic/pull/755) by [@samuelcolvin](https://github.com/samuelcolvin)
* **Breaking Change:** preserve superclass annotations for field-determination when not provided in subclass, [#757](https://github.com/pydantic/pydantic/pull/757) by [@dmontagu](https://github.com/dmontagu)
* **Breaking Change:** `BaseSettings` now uses the special `env` settings to define which environment variables to
  read, not aliases, [#847](https://github.com/pydantic/pydantic/pull/847) by [@samuelcolvin](https://github.com/samuelcolvin)
* add support for `assert` statements inside validators, [#653](https://github.com/pydantic/pydantic/pull/653) by [@abdusco](https://github.com/abdusco)
* Update documentation to specify the use of `pydantic.dataclasses.dataclass` and subclassing `pydantic.BaseModel`, [#710](https://github.com/pydantic/pydantic/pull/710) by [@maddosaurus](https://github.com/maddosaurus)
* Allow custom JSON decoding and encoding via `json_loads` and `json_dumps` `Config` properties, [#714](https://github.com/pydantic/pydantic/pull/714) by [@samuelcolvin](https://github.com/samuelcolvin)
* make all annotated fields occur in the order declared, [#715](https://github.com/pydantic/pydantic/pull/715) by [@dmontagu](https://github.com/dmontagu)
* use pytest to test `mypy` integration, [#735](https://github.com/pydantic/pydantic/pull/735) by [@dmontagu](https://github.com/dmontagu)
* add `__repr__` method to `ErrorWrapper`, [#738](https://github.com/pydantic/pydantic/pull/738) by [@samuelcolvin](https://github.com/samuelcolvin)
* Added support for `FrozenSet` members in dataclasses, and a better error when attempting to use types from the `typing` module that are not supported by Pydantic, [#745](https://github.com/pydantic/pydantic/pull/745) by [@djpetti](https://github.com/djpetti)
* add documentation for Pycharm Plugin, [#750](https://github.com/pydantic/pydantic/pull/750) by [@koxudaxi](https://github.com/koxudaxi)
* fix broken examples in the docs, [#753](https://github.com/pydantic/pydantic/pull/753) by [@dmontagu](https://github.com/dmontagu)
* moving typing related objects into `pydantic.typing`, [#761](https://github.com/pydantic/pydantic/pull/761) by [@samuelcolvin](https://github.com/samuelcolvin)
* Minor performance improvements to `ErrorWrapper`, `ValidationError` and datetime parsing, [#763](https://github.com/pydantic/pydantic/pull/763) by [@samuelcolvin](https://github.com/samuelcolvin)
* Improvements to `datetime`/`date`/`time`/`timedelta` types: more descriptive errors,
  change errors to `value_error` not `type_error`, support bytes, [#766](https://github.com/pydantic/pydantic/pull/766) by [@samuelcolvin](https://github.com/samuelcolvin)
* fix error messages for `Literal` types with multiple allowed values, [#770](https://github.com/pydantic/pydantic/pull/770) by [@dmontagu](https://github.com/dmontagu)
* Improved auto-generated `title` field in JSON schema by converting underscore to space, [#772](https://github.com/pydantic/pydantic/pull/772) by [@skewty](https://github.com/skewty)
* support `mypy --no-implicit-reexport` for dataclasses, also respect `--no-implicit-reexport` in pydantic itself, [#783](https://github.com/pydantic/pydantic/pull/783) by [@samuelcolvin](https://github.com/samuelcolvin)
* add the `PaymentCardNumber` type, [#790](https://github.com/pydantic/pydantic/pull/790) by [@matin](https://github.com/matin)
* Fix const validations for lists, [#794](https://github.com/pydantic/pydantic/pull/794) by [@hmvp](https://github.com/hmvp)
* Set `additionalProperties` to false in schema for models with extra fields disallowed, [#796](https://github.com/pydantic/pydantic/pull/796) by [@Code0x58](https://github.com/Code0x58)
* `EmailStr` validation method now returns local part case-sensitive per RFC 5321, [#798](https://github.com/pydantic/pydantic/pull/798) by [@henriklindgren](https://github.com/henriklindgren)
* Added ability to validate strictness to `ConstrainedFloat`, `ConstrainedInt` and `ConstrainedStr` and added
  `StrictFloat` and `StrictInt` classes, [#799](https://github.com/pydantic/pydantic/pull/799) by [@DerRidda](https://github.com/DerRidda)
* Improve handling of `None` and `Optional`, replace `whole` with `each_item` (inverse meaning, default `False`)
  on validators, [#803](https://github.com/pydantic/pydantic/pull/803) by [@samuelcolvin](https://github.com/samuelcolvin)
* add support for `Type[T]` type hints, [#807](https://github.com/pydantic/pydantic/pull/807) by [@timonbimon](https://github.com/timonbimon)
* Performance improvements from removing `change_exceptions`, change how pydantic error are constructed, [#819](https://github.com/pydantic/pydantic/pull/819) by [@samuelcolvin](https://github.com/samuelcolvin)
* Fix the error message arising when a `BaseModel`-type model field causes a `ValidationError` during parsing, [#820](https://github.com/pydantic/pydantic/pull/820) by [@dmontagu](https://github.com/dmontagu)
* allow `getter_dict` on `Config`, modify `GetterDict` to be more like a `Mapping` object and thus easier to work with, [#821](https://github.com/pydantic/pydantic/pull/821) by [@samuelcolvin](https://github.com/samuelcolvin)
* Only check `TypeVar` param on base `GenericModel` class, [#842](https://github.com/pydantic/pydantic/pull/842) by [@zpencerq](https://github.com/zpencerq)
* rename `Model._schema_cache` -> `Model.__schema_cache__`, `Model._json_encoder` -> `Model.__json_encoder__`,
  `Model._custom_root_type` -> `Model.__custom_root_type__`, [#851](https://github.com/pydantic/pydantic/pull/851) by [@samuelcolvin](https://github.com/samuelcolvin)


... see [here](https://docs.pydantic.dev/changelog/#v0322-2019-08-17) for earlier changes.