• Change dependency to typing-extensions>=4.2.0, #4885 by @samuelcolvin

Full Changelog: https://github.com/pydantic/pydantic/compare/v1.10.3...v1.10.4

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

Full Changelog: https://github.com/pydantic/pydantic/compare/v1.10.2...v1.10.3

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

Full Changelog: https://github.com/pydantic/pydantic/compare/v1.10.1...v1.10.2

• Add __hash__ method to pydancic.color.Color class, #4454 by @czaki

Full Changelog: https://github.com/pydantic/pydantic/compare/v1.10.0...v1.10.1

See #4419 for feedback and discussion, docs are live at pydantic-docs.helpmanual.io.

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

Full Changelog: https://github.com/pydantic/pydantic/compare/v1.9.0...v1.10.0

• Runtime warning if __slots__ is passed to create_model, __slots__ is then ignored, #4432 by @samuelcolvin

Full Changelog https://github.com/pydantic/pydantic/compare/v1.10.0a2...v1.10.0b1

Docs for this pre-release are available here

• Update requirement to typing_extensions>=4.1.0 to guarantee dataclass_transform is available, #4424 by @commonism
• Add Explosion and AWS to main sponsors, #4413 by @samuelcolvin
• Update documentation for copy_on_model_validation to reflect recent changes, #4369 by @samuelcolvin

Full Changelog https://github.com/pydantic/pydantic/compare/v1.10.0a1...v1.10.0a2

Docs for this pre-release are available here!

• 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 by @PrettyWood 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 by @tlambert03
• Rename master to main, #4405 by @hramezani
• Fix StrictStr does not raise ValidationError when max_length is present in Field, #4388 by @hramezani
• Make SecretStr and SecretBytes hashable, #4387 by @chbndrhnns
• Fix StrictBytes does not raise ValidationError when max_length is present in Field, #4380 by @JeanArhancet
• Add support for bare type, #4375 by @hramezani
• Support Python 3.11, including binaries for 3.11 in PyPI, #4374 by @samuelcolvin
• Add support for re.Pattern, #4366 by @hramezani
• Fix __post_init_post_parse__ is incorrectly passed keyword arguments when no __post_init__ is defined, #4361 by @hramezani
• Fix implicitly importing ForwardRef and Callable from pydantic.typing instead of typing and also expose MappingIntStrAny, #4358 by @aminalaee
• remove Any types from the dataclass decorator so it can be used with the disallow_any_expr mypy option, #4356 by @DetachHead
• moved repo to pydantic/pydantic, #4348 by @yezz123
• fix "extra fields not permitted" error when dataclass with Extra.forbid is validated multiple times, #4343 by @detachhead
• Add Python 3.9 and 3.10 examples to docs, #4339 by @Bobronium
• Discriminated union models now use oneOf instead of anyOf when generating OpenAPI schema definitions, #4335 by @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 by @Bobronium
• Allow empty string aliases by using a alias is not None check, rather than bool(alias), #4253 by @sergeytsaplin
• Update ForwardRefs in Field.outer_type_, #4249 by @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, #4241 by @multimeric
• Use parent model's Config when validating nested NamedTuple fields, #4219 by @synek
• Update BaseModel.construct to work with aliased Fields, #4192 by @kylebamos
• Catch certain raised errors in smart_deepcopy and revert to deepcopy if so, #4184 by @coneybeare
• Add Config.anystr_upper and to_upper kwarg to constr and conbytes, #4165 by @satheler
• Fix JSON schema for set and frozenset when they include default values, #4155 by @aminalaee
• Teach the mypy plugin that methods decorated by @validator are classmethods, #4102 by @DMRobertson
• Improve mypy plugin's ability to detect required fields, #4086 by @richardxia
• Support fields of type Type[] in schema, #4051 by @aminalaee
• Add default value in JSON Schema when const=True, #4031 by @aminalaee
• Adds reserved word check to signature generation logic, #4011 by @strue36
• Fix Json strategy failure for the complex nested field, #4005 by @sergiosim
• Add JSON-compatible float constraint allow_inf_nan, #3994 by @tiangolo
• Remove undefined behaviour when env_prefix had characters in common with env_nested_delimiter, #3975 by @arsenron
• Support generics model with create_model, #3945 by @hot123s
• allow submodels to overwrite extra field info, #3934 by @PrettyWood
• Document and test structural pattern matching (PEP 636) on BaseModel, #3920 by @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 by @07pepa
• Fix validation of discriminated union fields with an alias when passing a model instance, #3846 by @chornsby
• Add a CockroachDsn type to validate CockroachDB connection strings. The type supports the following schemes: cockroachdb, cockroachdb+psycopg2 and cockroachdb+asyncpg, #3839 by @blubber
• Fix MyPy plugin to not override pre-existing __init__ method in models, #3824 by @patrick91
• Fix mypy version checking, #3783 by @KotlinIsland
• support overwriting dunder attributes of BaseModel instances, #3777 by @PrettyWood
• Added ConstrainedDate and condate, #3740 by @hottwaj
• Support kw_only in dataclasses, #3670 by @detachhead
• Add comparison method for Color class, #3646 by @aminalaee
• Drop support for python3.6, associated cleanup, #3605 by @samuelcolvin
• created new function to_lower_camel() for "non pascal case" camel case, #3463 by @schlerp
• Add checks to default and default_factory arguments in Mypy plugin, #3430 by @klaa97
• fix mangling of inspect.signature for BaseModel, #3413 by @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 by @expobrain
• Support multi hosts validation in PostgresDsn, #3337 by @rglsk
• Fix parsing of very small numeric timedelta values, #3315 by @samuelcolvin
• Update SecretsSettingsSource to respect config.case_sensitive, #3273 by @JeanArhancet
• Add MongoDB network data source name (DSN) schema, #3229 by @snosratiershad
• Add support for multiple dotenv files, #3222 by @rekyungmin
• Raise an explicit ConfigError when multiple fields are incorrectly set for a single validator, #3215 by @SunsetOrange
• Allow ellipsis on Fields inside Annotated for TypedDicts required, #3133 by @ezegomez
• Catch overflow errors in int_validator, #3112 by @ojii
• Adds a __rich_repr__ method to Representation class which enables pretty printing with Rich, #3099 by @willmcgugan
• Add percent encoding in AnyUrl and descendent types, #3061 by @FaresAhmedb
• validate_arguments decorator now supports alias, #3019 by @MAD-py
• Avoid __dict__ and __weakref__ attributes in AnyUrl and IP address fields, #2890 by @nuno-andre
• Add ability to use Final in a field type annotation, #2766 by @uriyyo

Full Changelog: https://github.com/pydantic/pydantic/compare/v1.9.0...v1.10a1

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 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 by @timkpaine

Thank you to pydantic's sponsors: @tiangolo, @stellargraph, @JonasKs, @grillazz, @Mazyod, @kevinalh, @chdsbd, @povilasb, @povilasb, @jina-ai, @mainframeindustries, @robusta-dev, @SendCloud, @rszamszur, @jodal, @hardbyte, @corleyma, @daddycocoaman, @Rehket, @jokull, @reillysiemens, @westonsteimel, @primer-io, @koxudaxi, @browniebroke, @stradivari96, @adriangb, @kamalgill, @jqueguiner, @dev-zero, @datarootsio, @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 by @samuelcolvin
• Add Jupyverse and FPS as Jupyter projects using pydantic, #4082 by @davidbrochart
• Speedup __isinstancecheck__ on pydantic models when the type is not a model, may also avoid memory "leaks", #4081 by @samuelcolvin
• Fix in-place modification of FieldInfo that caused problems with PEP 593 type aliases, #4067 by @adriangb
• Add support for autocomplete in VS Code via __dataclass_transform__ when using pydantic.dataclasses.dataclass, #4006 by @giuliano-oliveira
• Remove benchmarks from codebase and docs, #3973 by @samuelcolvin
• Typing checking with pyright in CI, improve docs on vscode/pylance/pyright, #3972 by @samuelcolvin
• Fix nested Python dataclass schema regression, #3819 by @himbeles
• Update documentation about lazy evaluation of sources for Settings, #3806 by @garyd203
• Prevent subclasses of bytes being converted to bytes, #3706 by @samuelcolvin
• Fixed "error checking inheritance of" when using PEP585 and PEP604 type hints, #3681 by @aleksul
• Allow self referencing ClassVars in models, #3679 by @samuelcolvin
• Fix issue with self-referencing dataclass, #3675 by @uriyyo
• Include non-standard port numbers in rendered URLs, #3652 by @dolfinus
• Config.copy_on_model_validation does a deep copy and not a shallow one, #3641 by @PrettyWood
• fix: clarify that discriminated unions do not support singletons, #3636 by @tommilligan
• Add read_text(encoding='utf-8') for setup.py, #3625 by @hswong3i
• Fix JSON Schema generation for Discriminated Unions within lists, #3608 by @samuelcolvin

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

Highlights

• add python 3.10 support, #2885 by @PrettyWood
• Discriminated unions, #619 by @PrettyWood
• Config.smart_union for better union logic, #2092 by @PrettyWood
• Binaries for Macos M1 CPUs, #3498 by @samuelcolvin
• Complex types can be set via nested environment variables, e.g. foo___bar, #3159 by @Air-Mark
• add a dark mode to pydantic documentation, #2913 by @gbdlin
• Add support for autocomplete in VS Code via __dataclass_transform__, #2721 by @tiangolo
• Add "exclude" as a field parameter so that it can be configured using model config, #660 by @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 by @samuelcolvin
• Extend pydantic's mypy plugin to support mypy versions 0.910, 0.920, 0.921 & 0.930, #3573 & #3594 by @PrettyWood, @christianbundy, @samuelcolvin

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

• support generic models with discriminated union, #3551 by @PrettyWood
• keep old behaviour of json() by default, #3542 by @PrettyWood
• Removed typing-only __root__ attribute from BaseModel, #3540 by @layday
• Build Python 3.10 wheels, #3539 by @mbachry
• Fix display of extra fields with model __repr__, #3234 by @cocolman
• models copied via Config.copy_on_model_validation always have all fields, #3201 by @PrettyWood
• nested ORM from nested dictionaries, #3182 by @PrettyWood
• fix link to discriminated union section by @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 by @tiangolo
• Add arm64 binaries suitable for MacOS with an M1 CPU to PyPI, #3498 by @samuelcolvin
• Fix issue where None was considered invalid when using a Union type containing Any or object, #3444 by @tharradine
• When generating field schema, pass optional field argument (of type pydantic.fields.ModelField) to __modify_schema__() if present, #3434 by @jasujm
• Fix issue when pydantic fail to parse typing.ClassVar string type annotation, #3401 by @uriyyo
• Mention Python >= 3.9.2 as an alternative to typing_extensions.TypedDict, #3374 by @BvB93
• Changed the validator method name in the Custom Errors example to more accurately describe what the validator is doing; changed from name_must_contain_space to value_must_equal_bar, #3327 by @michaelrios28
• Add AmqpDsn class, #3254 by @kludex
• Always use Enum value as default in generated JSON schema, #3190 by @joaommartins
• Add support for Mypy 0.920, #3175 by @christianbundy
• validate_arguments now supports extra customization (used to always be Extra.forbid), #3161 by @PrettyWood
• Complex types can be set by nested environment variables, #3159 by @Air-Mark
• Fix mypy plugin to collect fields based on pydantic.utils.is_valid_field so that it ignores untyped private variables, #3146 by @hi-ogawa
• fix validate_arguments issue with Config.validate_all, #3135 by @PrettyWood
• avoid dict coercion when using dict subclasses as field type, #3122 by @PrettyWood
• add support for object type, #3062 by @PrettyWood
• Updates pydantic dataclasses to keep _special properties on parent classes, #3043 by @zulrang
• Add a TypedDict class for error objects, #3038 by @matthewhughes934
• Fix support for using a subclass of an annotation as a default, #3018 by @JacobHayes
• make create_model_from_typeddict mypy compliant, #3008 by @PrettyWood
• Make multiple inheritance work when using PrivateAttr, #2989 by @hmvp
• Parse environment variables as JSON, if they have a Union type with a complex subfield, #2936 by @cbartz
• Prevent StrictStr permitting Enum values where the enum inherits from str, #2929 by @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 by @davidmreed
• add a dark mode to pydantic documentation, #2913 by @gbdlin
• Make pydantic-mypy plugin compatible with pyproject.toml configuration, consistent with mypy changes. See the doc for more information, #2908 by @jrwalk
• add python 3.10 support, #2885 by @PrettyWood
• Correctly parse generic models with Json[T], #2860 by @geekingfrog
• Update contrib docs re: python version to use for building docs, #2856 by @paxcodes
• Clarify documentation about pydantic's support for custom validation and strict type checking, despite pydantic being primarily a parsing library, #2855 by @paxcodes
• Fix schema generation for Deque fields, #2810 by @sergejkozin
• fix an edge case when mixing constraints and Literal, #2794 by @PrettyWood
• Fix postponed annotation resolution for NamedTuple and TypedDict when they're used directly as the type of fields within Pydantic models, #2760 by @jameysharp
• Fix bug when mypy plugin fails on construct method call for BaseSettings derived classes, #2753 by @uriyyo
• Add function overloading for a pydantic.create_model function, #2748 by @uriyyo
• Fix mypy plugin issue with self field declaration, #2743 by @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 by @krisaoe
• Renamed variable schema to schema_ to avoid shadowing of global variable name, #2724 by @shahriyarr
• Add support for autocomplete in VS Code via __dataclass_transform__, #2721 by @tiangolo
• add missing type annotations in BaseConfig and handle max_length = 0, #2719 by @PrettyWood
• Change orm_mode checking to allow recursive ORM mode parsing with dicts, #2718 by @nuno-andre
• Add episode 313 of the Talk Python To Me podcast, where Michael Kennedy and Samuel Colvin discuss pydantic, to the docs, #2712 by @RatulMaharaj
• fix JSON schema generation when a field is of type NamedTuple and has a default value, #2707 by @PrettyWood
• Enum fields now properly support extra kwargs in schema generation, #2697 by @sammchardy
• Make serialization of referenced pydantic models possible, #2650 by @PrettyWood
• Add uniqueItems option to ConstrainedList, #2618 by @nuno-andre
• Try to evaluate forward refs automatically at model creation, #2588 by @uriyyo
• Switch docs preview and coverage display to use smokeshow, #2580 by @samuelcolvin
• Add __version__ attribute to pydantic module, #2572 by @paxcodes
• Add postgresql+asyncpg, postgresql+pg8000, postgresql+psycopg2, postgresql+psycopg2cffi, postgresql+py-postgresql and postgresql+pygresql schemes for PostgresDsn, #2567 by @postgres-asyncpg
• Enable the Hypothesis plugin to generate a constrained decimal when the decimal_places argument is specified, #2524 by @cwe5590
• Allow collections.abc.Callable to be used as type in python 3.9, #2519 by @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 by @peterroelants
• remove side effect of default_factory to run it only once even if Config.validate_all is set, #2515 by @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 by @sbv-csis
• Set minItems and maxItems in generated JSON schema for fixed-length tuples, #2497 by @PrettyWood
• Add strict argument to conbytes, #2489 by @koxudaxi
• Support user defined generic field types in generic models, #2465 by @daviskirk
• Add an example and a short explanation of subclassing GetterDict to docs, #2463 by @nuno-andre
• add KafkaDsn type, HttpUrl now has default port 80 for http and 443 for https, #2447 by @MihanixA
• Add PastDate and FutureDate types, #2425 by @Kludex
• Support generating schema for Generic fields with subtypes, #2375 by @maximberg
• fix(encoder): serialize NameEmail to str, #2341 by @alecgerona
• add Config.smart_union to prevent coercion in Union if possible, see the doc for more information, #2092 by @PrettyWood
• Add ability to use typing.Counter as a model field type, #2060 by @uriyyo
• Add parameterised subclasses to __bases__ when constructing new parameterised classes, so that A <: B => A[int] <: B[int], #2007 by @diabolo-dan
• Create FileUrl type that allows URLs that conform to RFC 8089. Add host_required parameter, which is True by default (AnyUrl and subclasses), False in RedisDsn, FileUrl, #1983 by @vgerak
• add confrozenset(), analogous to conset() and conlist(), #1897 by @PrettyWood
• stop calling parent class root_validator if overridden, #1895 by @PrettyWood
• Add repr (defaults to True) parameter to Field, to hide it from the default representation of the BaseModel, #1831 by @fnep
• Accept empty query/fragment URL parts, #1807 by @xavier

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

Full Changelog: https://github.com/samuelcolvin/pydantic/compare/v1.9.0a1...v1.9.0a2

Discussion and feedback: #3538

See Changelog.

Thank you to pydantic's sponsors: @timdrijvers, @toinbis, @koxudaxi, @ginomempin, @primer-io, @and-semakin, @westonsteimel, @reillysiemens, @es3n1n, @jokull, @JonasKs, @Rehket, @corleyma, @daddycocoaman, @hardbyte, @datarootsio, @jodal, @aminalaee, @rafsaf, @jqueguiner, @chdsbd, @kevinalh, @Mazyod, @grillazz, @JonasKs for their kind support.

Highlights

• add python 3.10 support, #2885 by @PrettyWood
• Discriminated unions, #619 by @PrettyWood
• Config.smart_union for better union logic, #2092 by @PrettyWood
• Binaries for Macos M1 CPUs, #3498 by @samuelcolvin
• Complex types can be set via nested environment variables, e.g. foo___bar, #3159 by @Air-Mark
• add a dark mode to pydantic documentation, #2913 by @gbdlin
• Add support for autocomplete in VS Code via __dataclass_transform__, #2721 by @tiangolo

Changes

• Add support for Decimal-specific validation configurations in Field(), additionally to using condecimal(), to allow better support from editors and tooling, #3507 by @tiangolo
• Add arm64 binaries suitable for MacOS with an M1 CPU to PyPI, #3498 by @samuelcolvin
• Fix issue where None was considered invalid when using a Union type containing Any or object, #3444 by @tharradine
• When generating field schema, pass optional field argument (of type pydantic.fields.ModelField) to __modify_schema__() if present, #3434 by @jasujm
• Fix issue when pydantic fail to parse typing.ClassVar string type annotation, #3401 by @uriyyo
• Mention Python >= 3.9.2 as an alternative to typing_extensions.TypedDict, #3374 by @BvB93
• Changed the validator method name in the Custom Errors example to more accurately describe what the validator is doing; changed from name_must_contain_space to value_must_equal_bar, #3327 by @michaelrios28
• Add AmqpDsn class, #3254 by @kludex
• Always use Enum value as default in generated JSON schema, #3190 by @joaommartins
• Add support for Mypy 0.920, #3175 by @christianbundy
• validate_arguments now supports extra customization (used to always be Extra.forbid), #3161 by @PrettyWood
• Complex types can be set by nested environment variables, #3159 by @Air-Mark
• Fix mypy plugin to collect fields based on pydantic.utils.is_valid_field so that it ignores untyped private variables, #3146 by @hi-ogawa
• fix validate_arguments issue with Config.validate_all, #3135 by @PrettyWood
• avoid dict coercion when using dict subclasses as field type, #3122 by @PrettyWood
• add support for object type, #3062 by @PrettyWood
• Updates pydantic dataclasses to keep _special properties on parent classes, #3043 by @zulrang
• Add a TypedDict class for error objects, #3038 by @matthewhughes934
• Fix support for using a subclass of an annotation as a default, #3018 by @JacobHayes
• make create_model_from_typeddict mypy compliant, #3008 by @PrettyWood
• Make multiple inheritance work when using PrivateAttr, #2989 by @hmvp
• Parse environment variables as JSON, if they have a Union type with a complex subfield, #2936 by @cbartz
• Prevent StrictStr permitting Enum values where the enum inherits from str, #2929 by @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 by @davidmreed
• add a dark mode to pydantic documentation, #2913 by @gbdlin
• Make pydantic-mypy plugin compatible with pyproject.toml configuration, consistent with mypy changes. See the doc for more information, #2908 by @jrwalk
• add python 3.10 support, #2885 by @PrettyWood
• Correctly parse generic models with Json[T], #2860 by @geekingfrog
• Update contrib docs re: python version to use for building docs, #2856 by @paxcodes
• Clarify documentation about pydantic's support for custom validation and strict type checking, despite pydantic being primarily a parsing library, #2855 by @paxcodes
• Fix schema generation for Deque fields, #2810 by @sergejkozin
• fix an edge case when mixing constraints and Literal, #2794 by @PrettyWood
• Fix postponed annotation resolution for NamedTuple and TypedDict when they're used directly as the type of fields within Pydantic models, #2760 by @jameysharp
• Fix bug when mypy plugin fails on construct method call for BaseSettings derived classes, #2753 by @uriyyo
• Add function overloading for a pydantic.create_model function, #2748 by @uriyyo
• Fix mypy plugin issue with self field declaration, #2743 by @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 by @krisaoe
• Renamed variable schema to schema_ to avoid shadowing of global variable name, #2724 by @shahriyarr
• Add support for autocomplete in VS Code via __dataclass_transform__, #2721 by @tiangolo
• add missing type annotations in BaseConfig and handle max_length = 0, #2719 by @PrettyWood
• Change orm_mode checking to allow recursive ORM mode parsing with dicts, #2718 by @nuno-andre
• Add episode 313 of the Talk Python To Me podcast, where Michael Kennedy and Samuel Colvin discuss pydantic, to the docs, #2712 by @RatulMaharaj
• fix JSON schema generation when a field is of type NamedTuple and has a default value, #2707 by @PrettyWood
• Enum fields now properly support extra kwargs in schema generation, #2697 by @sammchardy
• Make serialization of referenced pydantic models possible, #2650 by @PrettyWood
• Add uniqueItems option to ConstrainedList, #2618 by @nuno-andre
• Try to evaluate forward refs automatically at model creation, #2588 by @uriyyo
• Switch docs preview and coverage display to use smokeshow, #2580 by @samuelcolvin
• Add __version__ attribute to pydantic module, #2572 by @paxcodes
• Add postgresql+asyncpg, postgresql+pg8000, postgresql+psycopg2, postgresql+psycopg2cffi, postgresql+py-postgresql and postgresql+pygresql schemes for PostgresDsn, #2567 by @postgres-asyncpg
• Enable the Hypothesis plugin to generate a constrained decimal when the decimal_places argument is specified, #2524 by @cwe5590
• Allow collections.abc.Callable to be used as type in python 3.9, #2519 by @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 by @peterroelants
• remove side effect of default_factory to run it only once even if Config.validate_all is set, #2515 by @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 by @sbv-csis
• Set minItems and maxItems in generated JSON schema for fixed-length tuples, #2497 by @PrettyWood
• Add strict argument to conbytes, #2489 by @koxudaxi
• Support user defined generic field types in generic models, #2465 by @daviskirk
• Add an example and a short explanation of subclassing GetterDict to docs, #2463 by @nuno-andre
• add KafkaDsn type, HttpUrl now has default port 80 for http and 443 for https, #2447 by @MihanixA
• Add PastDate and FutureDate types, #2425 by @Kludex
• Support generating schema for Generic fields with subtypes, #2375 by @maximberg
• fix(encoder): serialize NameEmail to str, #2341 by @alecgerona
• add Config.smart_union to prevent coercion in Union if possible, see the doc for more information, #2092 by @PrettyWood
• Add ability to use typing.Counter as a model field type, #2060 by @uriyyo
• Add parameterised subclasses to __bases__ when constructing new parameterised classes, so that A <: B => A[int] <: B[int], #2007 by @diabolo-dan
• Create FileUrl type that allows URLs that conform to RFC 8089. Add host_required parameter, which is True by default (AnyUrl and subclasses), False in RedisDsn, FileUrl, #1983 by @vgerak
• add confrozenset(), analogous to conset() and conlist(), #1897 by @PrettyWood
• stop calling parent class root_validator if overridden, #1895 by @PrettyWood
• Add repr (defaults to True) parameter to Field, to hide it from the default representation of the BaseModel, #1831 by @fnep
• Accept empty query/fragment URL parts, #1807 by @xavier
• Add "exclude" as a field parameter so that it can be configured using model config instead of purely at .dict / .json export time, #660 by @daviskirk

Full List of changes: https://github.com/samuelcolvin/pydantic/compare/v1.8.2...v1.9.0a1

See Changelog.

Warning

A security vulnerability, level "moderate" is fixed in v1.8.2. Please upgrade ASAP. See security advisory CVE-2021-29510.

Changes

• 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
• fix schema generation with Enum by generating a valid name, #2575 by @PrettyWood
• fix JSON schema generation with a Literal of an enum member, #2536 by @PrettyWood
• Fix bug with configurations declarations that are passed as keyword arguments during class creation, #2532 by @uriyyo
• Allow passing json_encoders in class kwargs, #2521 by @layday
• support arbitrary types with custom __eq__, #2483 by @PrettyWood
• support Annotated in validate_arguments and in generic models with python 3.9, #2483 by @PrettyWood

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.

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.

See Changelog.

Bug fixes for regressions and new features in v1.8

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

See Changelog.

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

Highlights

• Hypothesis plugin for testing, #2097 by @Zac-HD
• support for NamedTuple and TypedDict, #2216 by @PrettyWood
• Support Annotated hints on model fields, #2147 by @JacobHayes
• frozen parameter on Config to allow models to be hashed, #1880 by @rhuille

Changes

• Breaking Change, remove old deprecation aliases from v1, #2415 by @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 by @PrettyWood
• Update docs extensions to fix local syntax highlighting, #2400 by @daviskirk
• fix: allow utils.lenient_issubclass to handle typing.GenericAlias objects like list[str] in python >= 3.9, #2399 by @daviskirk
• Improve field declaration for pydantic dataclass by allowing the usage of pydantic Field or 'metadata' kwarg of dataclasses.field, #2384 by @PrettyWood
• Making typing-extensions a required dependency, #2368 by @samuelcolvin
• Make resolve_annotations more lenient, allowing for missing modules, #2363 by @samuelcolvin
• Allow configuring models through class kwargs, #2356 by @MrMrRobat
• Prevent Mapping subclasses from always being coerced to dict, #2325 by @ofek
• fix: allow None for type Optional[conset / conlist], #2320 by @PrettyWood
• Support empty tuple type, #2318 by @PrettyWood
• fix: python_requires metadata to require >=3.6.1, #2306 by @hukkinj1
• Properly encode Decimal with, or without any decimal places, #2293 by @hultner
• fix: update __fields_set__ in BaseModel.copy(update=…), #2290 by @PrettyWood
• fix: keep order of fields with BaseModel.construct(), #2281 by @PrettyWood
• Support generating schema for Generic fields, #2262 by @maximberg
• Fix validate_decorator so **kwargs doesn't exclude values when the keyword has the same name as the *args or **kwargs names, #2251 by @cybojenix
• Prevent overriding positional arguments with keyword arguments in validate_arguments, as per behaviour with native functions, #2249 by @cybojenix
• add documentation for con* type functions, #2242 by @tayoogunbiyi
• Support custom root type (aka __root__) when using parse_obj() with nested models, #2238 by @PrettyWood
• Support custom root type (aka __root__) with from_orm(), #2237 by @PrettyWood
• ensure cythonized functions are left untouched when creating models, based on #1944 by @kollmats, #2228 by @samuelcolvin
• Resolve forward refs for stdlib dataclasses converted into pydantic ones, #2220 by @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 by @PrettyWood
• Do not ignore annotated fields when type is Union[Type[...], ...], #2213 by @PrettyWood
• Raise a user-friendly TypeError when a root_validator does not return a dict (e.g. None), #2209 by @masalim2
• Add a FrozenSet[str] type annotation to the allowed_schemes argument on the strict_url field type, #2198 by @Midnighter
• add allow_mutation constraint to Field, #2195 by @sblack-usu
• Allow Field with a default_factory to be used as an argument to a function decorated with validate_arguments, #2176 by @thomascobb
• Allow non-existent secrets directory by only issuing a warning, #2175 by @davidolrik
• fix URL regex to parse fragment without query string, #2168 by @andrewmwhite
• fix: ensure to always return one of the values in Literal field type, #2166 by @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 by @JacobHayes
• Added StrictBytes type as well as strict=False option to ConstrainedBytes, #2136 by @rlizzo
• added Config.anystr_lower and to_lower kwarg to constr and conbytes, #2134 by @tayoogunbiyi
• Support plain typing.Tuple type, #2132 by @PrettyWood
• Add a bound method validate to functions decorated with validate_arguments to validate parameters without actually calling the function, #2127 by @PrettyWood
• Add the ability to customize settings sources (add / disable / change priority order), #2107 by @kozlek
• Fix mypy complaints about most custom pydantic types, #2098 by @PrettyWood
• Add a Hypothesis plugin for easier property-based testing with Pydantic's custom types - usage details here, #2097 by @Zac-HD
• add validator for None, NoneType or Literal[None], #2095 by @PrettyWood
• Handle properly fields of type Callable with a default value, #2094 by @PrettyWood
• Updated create_model return type annotation to return type which inherits from __base__ argument, #2071 by @uriyyo
• Add merged json_encoders inheritance, #2064 by @art049
• allow overwriting ClassVars in sub-models without having to re-annotate them, #2061 by @layday
• add default encoder for Pattern type, #2045 by @PrettyWood
• Add NonNegativeInt, NonPositiveInt, NonNegativeFloat, NonPositiveFloat, #1975 by @mdavis-xyz
• Use % for percentage in string format of colors, #1960 by @EdwardBetts
• Fixed issue causing KeyError to be raised when building schema from multiple BaseModel with the same names declared in separate classes, #1912 by @JSextonn
• Add rediss (Redis over SSL) protocol to RedisDsn Allow URLs without user part (e.g., rediss://:[email protected]), #1911 by @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 by @rhuille
• fix schema generation with multiple Enums having the same name, #1857 by @PrettyWood
• Added support for 13/19 digits VISA credit cards in PaymentCardNumber type, #1416 by @AlexanderSov
• fix: prevent RecursionError while using recursive GenericModels, #1370 by @xppt
• use enum for typing.Literal in JSON schema, #1350 by @PrettyWood
• Fix: some recursive models did not require update_forward_refs and silently behaved incorrectly, #1201 by @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 by @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 by @PrettyWood

See Changelog.

Thank you to pydantic's sponsors: @timdrijvers, @BCarley, @chdsbd, @tiangolo, @matin, @linusg, @kevinalh, @jorgecarleitao, @koxudaxi, @primer-api, @mkeen, @meadsteve for their kind support.

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

See Changelog.

Thank you to pydantic's sponsors: @timdrijvers, @BCarley, @chdsbd, @tiangolo, @matin, @linusg, @kevinalh, @jorgecarleitao, @koxudaxi, @primer-api, @mkeen for their kind support.

• fix slow GenericModel concrete model creation, allow GenericModel concrete name reusing in module, #2078 by @MrMrRobat
• keep the order of the fields when validate_assignment is set, #2073 by @PrettyWood
• forward all the params of the stdlib dataclass when converted into pydantic dataclass, #2065 by @PrettyWood

See Changelog.

Thank you to pydantic's sponsors: @timdrijvers, @BCarley, @chdsbd, @tiangolo, @matin, @linusg, @kevinalh, @jorgecarleitao, @koxudaxi, @primer-api, @mkeen for their kind support.

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

See Changelog.

Thank you to pydantic's sponsors: @timdrijvers, @BCarley, @chdsbd, @tiangolo, @matin, @linusg, @kevinalh, @jorgecarleitao, @koxudaxi, @primer-api for their kind support.

Highlights

• python 3.9 support, thanks @PrettyWood
• Private model attributes, thanks @MrMrRobat
• "secrets files" support in BaseSettings, thanks @mdgilene
• convert stdlib dataclasses to pydantic dataclasses and use stdlib dataclasses in models, thanks @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 by @PrettyWood
• Rearrange CI to run linting as a separate job, split install recipes for different tasks, #2020 by @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 by @choogeboom
• Call validator with the correct values parameter type in BaseModel.__setattr__, when validate_assignment = True in model config, #1999 by @me-ransh
• Force fields.Undefined to be a singleton object, fixing inherited generic model schemas, #1981 by @daviskirk
• Include tests in source distributions, #1976 by @sbraz
• Add ability to use min_length/max_length constraints with secret types, #1974 by @uriyyo
• Also check root_validators when validate_assignment is on, #1971 by @PrettyWood
• Fix const validators not running when custom validators are present, #1957 by @hmvp
• add deque to field types, #1935 by @wozniakty
• add basic support for python 3.9, #1832 by @PrettyWood
• Fix typo in the anchor of exporting_models.md#modelcopy and incorrect description, #1821 by @KimMachineGun
• Added ability for BaseSettings to read "secret files", #1820 by @mdgilene
• add parse_raw_as utility function, #1812 by @PrettyWood
• Support home directory relative paths for dotenv files (e.g. ~/.env), #1803 by @PrettyWood
• Clarify documentation for parse_file to show that the argument should be a file path not a file-like object, #1794 by @mdavis-xyz
• Fix false positive from mypy plugin when a class nested within a BaseModel is named Model, #1770 by @selimb
• add basic support of Pattern type in schema generation, #1767 by @PrettyWood
• Support custom title, description and default in schema of enums, #1748 by @PrettyWood
• Properly represent Literal Enums when use_enum_values is True, #1747 by @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 by @noelevans
• Add stub __init__ with python 3.6 signature for ForwardRef, #1738 by @sirtelemak
• Fix behaviour with forward refs and optional fields in nested models, #1736 by @PrettyWood
• add Enum and IntEnum as valid types for fields, #1735 by @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 by @MrMrRobat
• Add private attributes support, #1679 by @MrMrRobat
• add config to @validate_arguments, #1663 by @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 by @ojomio
• Support ref_template when creating schema $refs, #1479 by @kilo59
• Add a __call__ stub to PyObject so that mypy will know that it is callable, #1352 by @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 by @PrettyWood

See Changelog.

Thank you to pydantic's sponsors: @matin, @tiangolo, @chdsbd, @jorgecarleitao, and 1 anonymous sponsor for their kind support.

changes:

• fix validation and parsing of nested models with default_factory, #1710 by @PrettyWood

See Changelog.

Thank you to pydantic's sponsors: @matin, @tiangolo, @chdsbd, @jorgecarleitao, and 1 anonymous sponsor for their kind support.

changes:

• Modify validators for conlist and conset to not have always=True, #1682 by @samuelcolvin
• add port check to AnyUrl (can't exceed 65536) ports are 16 insigned bits: 0 <= port <= 2**16-1 src: rfc793 header format, #1654 by @flapili
• Document default regex anchoring semantics, #1648 by @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 by @cool-RR
• Add conset(), analogous to conlist(), #1623 by @patrickkwang
• make pydantic errors (un)pickable, #1616 by @PrettyWood
• Allow custom encoding for dotenv files, #1615 by @PrettyWood
• Ensure SchemaExtraCallable is always defined to get type hints on BaseConfig, #1614 by @PrettyWood
• Update datetime parser to support negative timestamps, #1600 by @mlbiche
• Update mypy, remove AnyType alias for Type[Any], #1598 by @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 by @beezee
• Make __modify_schema__ on Enums apply to the enum schema rather than fields that use the enum, #1581 by @therefromhere
• Fix behavior of __all__ key when used in conjunction with index keys in advanced include/exclude of fields that are sequences, #1579 by @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 by @samueldeklund
• change schema.field_class_to_schema to support frozenset in schema, #1557 by @wangpeibao
• Call __modify_schema__ only for the field schema, #1552 by @PrettyWood
• Move the assignment of field.validate_always in fields.py so the always parameter of validators work on inheritance, #1545 by @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 by @shawnwall
• Add a test assertion that default_factory can return a singleton, #1523 by @therefromhere
• Add NameEmail.__eq__ so duplicate NameEmail instances are evaluated as equal, #1514 by @stephen-bunn
• Add datamodel-code-generator link in pydantic document site, #1500 by @koxudaxi
• Added a "Discussion of Pydantic" section to the documentation, with a link to "Pydantic Introduction" video by Alexander Hultnér, #1499 by @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 by @PrettyWood
• Added docs about dumping dataclasses to JSON, #1487 by @mikegrima
• Make BaseModel.__signature__ class-only, so getting __signature__ from model instance will raise AttributeError, #1466 by @MrMrRobat
• include 'format': 'password' in the schema for secret types, #1424 by @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 by @vdwees
• Squash internal __root__ dicts in .dict() (and, by extension, in .json()), #1414 by @patrickkwang
• Move const validator to post-validators so it validates the parsed value, #1410 by @selimb
• Fix model validation to handle nested literals, e.g. Literal['foo', Literal['bar']], #1364 by @DBCerigo
• Remove user_required = True from RedisDsn, neither user nor password are required, #1275 by @samuelcolvin
• Remove extra allOf from schema for fields with Union and custom Field, #1209 by @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 by @calvinwyoung

See Changelog.

• Signature generation with extra: allow never uses a field name, #1418 by @prettywood
• Avoid mutating Field default value, #1412 by @prettywood

See Changelog.

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

See Changelog.

• 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 for details, #1178 by @samuelcolvin
• Add support for unicode and punycode in TLDs, #1182 by @jamescurtin
• Fix cls argument in validators during assignment, #1172 by @samuelcolvin
• completing Luhn algorithm for PaymentCardNumber, #1166 by @cuencandres
• add support for generics that implement __get_validators__ like a custom data type, #1159 by @tiangolo
• add support for infinite generators with Iterable, #1152 by @tiangolo
• fix url_regex to accept schemas with +, - and . after the first character, #1142 by @samuelcolvin
• move version_info() to version.py, suggest its use in issues, #1138 by @samuelcolvin
• Improve pydantic import time by roughly 50% by deferring some module loading and regex compilation, #1127 by @samuelcolvin
• Fix EmailStr and NameEmail to accept instances of themselves in cython, #1126 by @koxudaxi
• Pass model class to the Config.schema_extra callable, #1125 by @therefromhere
• Fix regex for username and password in URLs, #1115 by @samuelcolvin
• Add support for nested generic models, #1104 by @dmontagu
• add __all__ to __init__.py to prevent "implicit reexport" errors from mypy, #1072 by @samuelcolvin
• Add support for using "dotenv" files with BaseSettings, #1011 by @acnebs

See Changelog.

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

See Changelog.

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

See Changelog.

• Fix bug where use of complex fields on sub-models could cause fields to be incorrectly configured, #1015 by @samuelcolvin