Test case failures in Python 3.9

[tirkarthi]

Bug

__args__ was removed in https://bugs.python.org/issue40397 and https://bugs.python.org/issue40398 . It seems a lot of places use it that causes test failures in Python 3.9. A quick grep of args shows many places.

rg __args__ 
pydantic/fields.py
425:            for type_ in self.type_.__args__:
447:            for i, t in enumerate(self.type_.__args__):
449:                    self.type_ = self.type_.__args__[0]
463:            self.type_ = self.type_.__args__[0]
473:            self.type_ = self.type_.__args__[0]
476:            self.type_ = self.type_.__args__[0]
479:            self.type_ = self.type_.__args__[0]
482:            self.key_field = self._create_sub_type(self.type_.__args__[0], 'key_' + self.name, for_keys=True)
483:            self.type_ = self.type_.__args__[1]
488:            self.type_ = self.type_.__args__[0]
497:            self.sub_fields = [self._create_sub_type(t, f'{self.name}_{i}') for i, t in enumerate(self.type_.__args__)]

pydantic/types.py
135:    __args__: List[Type[T]]  # type: ignore
167:    # __args__ is needed to conform to typing generics api
168:    namespace = {'min_items': min_items, 'max_items': max_items, 'item_type': item_type, '__args__': [item_type]}
177:    __args__: Set[Type[T]]  # type: ignore
206:    # __args__ is needed to conform to typing generics api
207:    namespace = {'min_items': min_items, 'max_items': max_items, 'item_type': item_type, '__args__': [item_type]}

pydantic/schema.py
808:            args: Tuple[Any, ...] = type_.__args__

pydantic/typing.py
179:        return type_.__args__
250:            if type_.__args__ is None or not isinstance(type_.__args__[0], type):
252:            return type_.__args__[0]

Sample test failure :

pytest -k test_list_bare  
=============================== test session starts ===============================
platform linux -- Python 3.9.0b5, pytest-5.3.1, py-1.5.3, pluggy-0.12.0
rootdir: /root/checked_repos/pydantic, inifile: setup.cfg, testpaths: tests
plugins: hypothesis-4.43.1, cov-2.8.1
collected 1754 items / 1753 deselected / 1 selected                               

tests/test_edge_cases.py F                                                  [100%]

==================================== FAILURES =====================================
_________________________________ test_list_bare __________________________________

    def test_list_bare():
>       class MyModel(BaseModel):

tests/test_edge_cases.py:1356: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
pydantic/main.py:262: in __new__
    fields[ann_name] = inferred = ModelField.infer(
pydantic/fields.py:309: in infer
    return cls(
pydantic/fields.py:271: in __init__
    self.prepare()
pydantic/fields.py:345: in prepare
    self._type_analysis()
pydantic/fields.py:463: in _type_analysis
    self.type_ = self.type_.__args__[0]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = typing.List, attr = '__args__'

    def __getattr__(self, attr):
        # We are careful for copy and pickle.
        # Also for simplicity we just don't relay all dunder names
        if '__origin__' in self.__dict__ and not _is_dunder(attr):
            return getattr(self.__origin__, attr)
>       raise AttributeError(attr)
E       AttributeError: __args__

/usr/lib/python3.9/typing.py:640: AttributeError
======================= 1 failed, 1753 deselected in 1.37s ========================

[tirkarthi]

Full log of test case failures as attached

Edit: By mistake I had typing_extensions installed in virtual environment that gave more test failures. Reran on fresh environment and errors as below. Please also use latest pytest. Apologies for the confusion. Removed the log file.

 pytest                           
=============================== test session starts ===============================
platform linux -- Python 3.9.0b5, pytest-6.0.1, py-1.9.0, pluggy-0.13.1
rootdir: /root/checked_repos/pydantic, configfile: setup.cfg, testpaths: tests
collected 1754 items                                                              

tests/test_abc.py ..                                                        [  0%]
tests/test_aliases.py ..................                                    [  1%]
tests/test_callable.py ....                                                 [  1%]
tests/test_color.py ....................................................... [  4%]
...............                                                             [  5%]
tests/test_construction.py ....................                             [  6%]
tests/test_create_model.py ..............                                   [  7%]
tests/test_dataclasses.py .....................................             [  9%]
tests/test_datetime_parse.py .............................................. [ 12%]
.....................................................................       [ 15%]
tests/test_decorator.py ............                                        [ 16%]
tests/test_edge_cases.py .................................................. [ 19%]
........................................................................... [ 23%]
.....FF..................                                                   [ 25%]
tests/test_errors.py .................                                      [ 26%]
tests/test_forward_ref.py ................                                  [ 27%]
tests/test_generics.py ................................                     [ 28%]
tests/test_json.py .......................................                  [ 31%]
tests/test_main.py ................................................FF...... [ 34%]
........................F..                                                 [ 35%]
tests/test_model_signature.py ..........                                    [ 36%]
tests/test_networks.py .................................................... [ 39%]
............................................................sssssssssssssss [ 43%]
sssssssssssssssssssss.ss                                                    [ 45%]
tests/test_networks_ipaddress.py .......................................... [ 47%]
........................................................................... [ 51%]
.......................................                                     [ 53%]
tests/test_orm_mode.py ..........                                           [ 54%]
tests/test_parse.py ......................                                  [ 55%]
tests/test_schema.py .........................................ss........... [ 58%]
.......................................................................F... [ 63%]
.................................................F......................... [ 67%]
..F..                                                                       [ 67%]
tests/test_settings.py ...........................ssssssssssss....          [ 70%]
tests/test_tools.py ..........                                              [ 70%]
tests/test_types.py ....................................................... [ 73%]
....................................................................ss..... [ 78%]
........................................................................... [ 82%]
........................................................................... [ 86%]
..................FFss...............                                       [ 88%]
tests/test_types_payment_card_number.py ................................... [ 90%]
..........                                                                  [ 91%]
tests/test_utils.py .......................ss...........                    [ 93%]
tests/test_validators.py .................................................. [ 96%]
..............................................                              [ 98%]
tests/test_validators_dataclass.py .......                                  [ 99%]
tests/mypy/test_mypy.py ssssssssss...                                       [100%]

==================================== FAILURES =====================================
_________________________________ test_dict_bare __________________________________

    def test_dict_bare():
>       class MyModel(BaseModel):

tests/test_edge_cases.py:1348: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
pydantic/main.py:262: in __new__
    fields[ann_name] = inferred = ModelField.infer(
pydantic/fields.py:309: in infer
    return cls(
pydantic/fields.py:271: in __init__
    self.prepare()
pydantic/fields.py:345: in prepare
    self._type_analysis()
pydantic/fields.py:482: in _type_analysis
    self.key_field = self._create_sub_type(self.type_.__args__[0], 'key_' + self.name, for_keys=True)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = typing.Dict, attr = '__args__'

    def __getattr__(self, attr):
        # We are careful for copy and pickle.
        # Also for simplicity we just don't relay all dunder names
        if '__origin__' in self.__dict__ and not _is_dunder(attr):
            return getattr(self.__origin__, attr)
>       raise AttributeError(attr)
E       AttributeError: __args__

/usr/lib/python3.9/typing.py:640: AttributeError
_________________________________ test_list_bare __________________________________

    def test_list_bare():
>       class MyModel(BaseModel):

tests/test_edge_cases.py:1356: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
pydantic/main.py:262: in __new__
    fields[ann_name] = inferred = ModelField.infer(
pydantic/fields.py:309: in infer
    return cls(
pydantic/fields.py:271: in __init__
    self.prepare()
pydantic/fields.py:345: in prepare
    self._type_analysis()
pydantic/fields.py:463: in _type_analysis
    self.type_ = self.type_.__args__[0]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = typing.List, attr = '__args__'

    def __getattr__(self, attr):
        # We are careful for copy and pickle.
        # Also for simplicity we just don't relay all dunder names
        if '__origin__' in self.__dict__ and not _is_dunder(attr):
            return getattr(self.__origin__, attr)
>       raise AttributeError(attr)
E       AttributeError: __args__

/usr/lib/python3.9/typing.py:640: AttributeError
_____________________ test_bare_type_type_validation_success ______________________

type_ = typing.Type, config = <class 'pydantic.main.Config'>

    def find_validators(  # noqa: C901 (ignore complexity)
        type_: Type[Any], config: Type['BaseConfig']
    ) -> Generator[AnyCallable, None, None]:
        if type_ is Any:
            return
        type_type = type_.__class__
        if type_type == ForwardRef or type_type == TypeVar:
            return
        if type_ is Pattern:
            yield pattern_validator
            return
        if type_ is Hashable:
            yield hashable_validator
            return
        if is_callable_type(type_):
            yield callable_validator
            return
        if is_literal_type(type_):
            yield make_literal_validator(type_)
            return
    
        class_ = get_class(type_)
        if class_ is not None:
            if isinstance(class_, type):
                yield make_class_validator(class_)
            else:
                yield any_class_validator
            return
    
        for val_type, validators in _VALIDATORS:
            try:
>               if issubclass(type_, val_type):
E               TypeError: issubclass() arg 1 must be a class

pydantic/validators.py:579: TypeError

During handling of the above exception, another exception occurred:

    def test_bare_type_type_validation_success():
>       class ArbitraryClassAllowedModel(BaseModel):

tests/test_main.py:716: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
pydantic/main.py:262: in __new__
    fields[ann_name] = inferred = ModelField.infer(
pydantic/fields.py:309: in infer
    return cls(
pydantic/fields.py:271: in __init__
    self.prepare()
pydantic/fields.py:351: in prepare
    self.populate_validators()
pydantic/fields.py:529: in populate_validators
    *(get_validators() if get_validators else list(find_validators(self.type_, self.model_config))),
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

type_ = typing.Type, config = <class 'pydantic.main.Config'>

    def find_validators(  # noqa: C901 (ignore complexity)
        type_: Type[Any], config: Type['BaseConfig']
    ) -> Generator[AnyCallable, None, None]:
        if type_ is Any:
            return
        type_type = type_.__class__
        if type_type == ForwardRef or type_type == TypeVar:
            return
        if type_ is Pattern:
            yield pattern_validator
            return
        if type_ is Hashable:
            yield hashable_validator
            return
        if is_callable_type(type_):
            yield callable_validator
            return
        if is_literal_type(type_):
            yield make_literal_validator(type_)
            return
    
        class_ = get_class(type_)
        if class_ is not None:
            if isinstance(class_, type):
                yield make_class_validator(class_)
            else:
                yield any_class_validator
            return
    
        for val_type, validators in _VALIDATORS:
            try:
                if issubclass(type_, val_type):
                    for v in validators:
                        if isinstance(v, IfConfig):
                            if v.check(config):
                                yield v.validator
                        else:
                            yield v
                    return
            except TypeError:
>               raise RuntimeError(f'error checking inheritance of {type_!r} (type: {display_as_type(type_)})')
E               RuntimeError: error checking inheritance of typing.Type (type: Type)

pydantic/validators.py:588: RuntimeError
______________________ test_bare_type_type_validation_fails _______________________

type_ = typing.Type, config = <class 'pydantic.main.Config'>

    def find_validators(  # noqa: C901 (ignore complexity)
        type_: Type[Any], config: Type['BaseConfig']
    ) -> Generator[AnyCallable, None, None]:
        if type_ is Any:
            return
        type_type = type_.__class__
        if type_type == ForwardRef or type_type == TypeVar:
            return
        if type_ is Pattern:
            yield pattern_validator
            return
        if type_ is Hashable:
            yield hashable_validator
            return
        if is_callable_type(type_):
            yield callable_validator
            return
        if is_literal_type(type_):
            yield make_literal_validator(type_)
            return
    
        class_ = get_class(type_)
        if class_ is not None:
            if isinstance(class_, type):
                yield make_class_validator(class_)
            else:
                yield any_class_validator
            return
    
        for val_type, validators in _VALIDATORS:
            try:
>               if issubclass(type_, val_type):
E               TypeError: issubclass() arg 1 must be a class

pydantic/validators.py:579: TypeError

During handling of the above exception, another exception occurred:

    def test_bare_type_type_validation_fails():
>       class ArbitraryClassAllowedModel(BaseModel):

tests/test_main.py:725: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
pydantic/main.py:262: in __new__
    fields[ann_name] = inferred = ModelField.infer(
pydantic/fields.py:309: in infer
    return cls(
pydantic/fields.py:271: in __init__
    self.prepare()
pydantic/fields.py:351: in prepare
    self.populate_validators()
pydantic/fields.py:529: in populate_validators
    *(get_validators() if get_validators else list(find_validators(self.type_, self.model_config))),
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

type_ = typing.Type, config = <class 'pydantic.main.Config'>

    def find_validators(  # noqa: C901 (ignore complexity)
        type_: Type[Any], config: Type['BaseConfig']
    ) -> Generator[AnyCallable, None, None]:
        if type_ is Any:
            return
        type_type = type_.__class__
        if type_type == ForwardRef or type_type == TypeVar:
            return
        if type_ is Pattern:
            yield pattern_validator
            return
        if type_ is Hashable:
            yield hashable_validator
            return
        if is_callable_type(type_):
            yield callable_validator
            return
        if is_literal_type(type_):
            yield make_literal_validator(type_)
            return
    
        class_ = get_class(type_)
        if class_ is not None:
            if isinstance(class_, type):
                yield make_class_validator(class_)
            else:
                yield any_class_validator
            return
    
        for val_type, validators in _VALIDATORS:
            try:
                if issubclass(type_, val_type):
                    for v in validators:
                        if isinstance(v, IfConfig):
                            if v.check(config):
                                yield v.validator
                        else:
                            yield v
                    return
            except TypeError:
>               raise RuntimeError(f'error checking inheritance of {type_!r} (type: {display_as_type(type_)})')
E               RuntimeError: error checking inheritance of typing.Type (type: Type)

pydantic/validators.py:588: RuntimeError
_____________________________ test_none_min_max_items _____________________________

    @pytest.mark.skipif(sys.version_info < (3, 7), reason='field constraints are set but not enforced with python 3.6')
    def test_none_min_max_items():
        # None default
>       class Foo(BaseModel):

tests/test_main.py:1210: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
pydantic/main.py:262: in __new__
    fields[ann_name] = inferred = ModelField.infer(
pydantic/fields.py:309: in infer
    return cls(
pydantic/fields.py:271: in __init__
    self.prepare()
pydantic/fields.py:345: in prepare
    self._type_analysis()
pydantic/fields.py:463: in _type_analysis
    self.type_ = self.type_.__args__[0]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = typing.List, attr = '__args__'

    def __getattr__(self, attr):
        # We are careful for copy and pickle.
        # Also for simplicity we just don't relay all dunder names
        if '__origin__' in self.__dict__ and not _is_dunder(attr):
            return getattr(self.__origin__, attr)
>       raise AttributeError(attr)
E       AttributeError: __args__

/usr/lib/python3.9/typing.py:640: AttributeError
_______________ test_unenforced_constraints_schema[kwargs8-type_8] ________________

kwargs = {'gt': 0}, type_ = typing.Callable

    @pytest.mark.parametrize(
        'kwargs,type_',
        [
            ({'max_length': 5}, int),
            ({'min_length': 2}, float),
            ({'max_length': 5}, Decimal),
            ({'regex': '^foo$'}, int),
            ({'gt': 2}, str),
            ({'lt': 5}, bytes),
            ({'ge': 2}, str),
            ({'le': 5}, bool),
            ({'gt': 0}, Callable),
            ({'gt': 0}, Callable[[int], int]),
            ({'gt': 0}, conlist(int, min_items=4)),
            ({'gt': 0}, conset(int, min_items=4)),
        ],
    )
    def test_unenforced_constraints_schema(kwargs, type_):
        with pytest.raises(ValueError, match='On field "a" the following field constraints are set but not enforced'):
    
>           class Foo(BaseModel):

tests/test_schema.py:1222: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
pydantic/main.py:262: in __new__
    fields[ann_name] = inferred = ModelField.infer(
pydantic/fields.py:308: in infer
    annotation = get_annotation_from_field_info(annotation, field_info, name)
pydantic/schema.py:860: in get_annotation_from_field_info
    ans = go(annotation)
pydantic/schema.py:808: in go
    args: Tuple[Any, ...] = type_.__args__
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = typing.Callable, attr = '__args__'

    def __getattr__(self, attr):
        # We are careful for copy and pickle.
        # Also for simplicity we just don't relay all dunder names
        if '__origin__' in self.__dict__ and not _is_dunder(attr):
            return getattr(self.__origin__, attr)
>       raise AttributeError(attr)
E       AttributeError: __args__

/usr/lib/python3.9/typing.py:640: AttributeError
_____________________ test_unparameterized_schema_generation ______________________

    def test_unparameterized_schema_generation():
>       class FooList(BaseModel):

tests/test_schema.py:1391: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
pydantic/main.py:262: in __new__
    fields[ann_name] = inferred = ModelField.infer(
pydantic/fields.py:309: in infer
    return cls(
pydantic/fields.py:271: in __init__
    self.prepare()
pydantic/fields.py:345: in prepare
    self._type_analysis()
pydantic/fields.py:463: in _type_analysis
    self.type_ = self.type_.__args__[0]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = typing.List, attr = '__args__'

    def __getattr__(self, attr):
        # We are careful for copy and pickle.
        # Also for simplicity we just don't relay all dunder names
        if '__origin__' in self.__dict__ and not _is_dunder(attr):
            return getattr(self.__origin__, attr)
>       raise AttributeError(attr)
E       AttributeError: __args__

/usr/lib/python3.9/typing.py:640: AttributeError
_________________________________ test_frozen_set _________________________________

    def test_frozen_set():
>       class Model(BaseModel):

tests/test_schema.py:1834: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
pydantic/main.py:262: in __new__
    fields[ann_name] = inferred = ModelField.infer(
pydantic/fields.py:309: in infer
    return cls(
pydantic/fields.py:271: in __init__
    self.prepare()
pydantic/fields.py:345: in prepare
    self._type_analysis()
pydantic/fields.py:476: in _type_analysis
    self.type_ = self.type_.__args__[0]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = typing.FrozenSet, attr = '__args__'

    def __getattr__(self, attr):
        # We are careful for copy and pickle.
        # Also for simplicity we just don't relay all dunder names
        if '__origin__' in self.__dict__ and not _is_dunder(attr):
            return getattr(self.__origin__, attr)
>       raise AttributeError(attr)
E       AttributeError: __args__

/usr/lib/python3.9/typing.py:640: AttributeError
___________________________ test_generic_without_params ___________________________

    def test_generic_without_params():
>       class Model(BaseModel):

tests/test_types.py:2184: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
pydantic/main.py:262: in __new__
    fields[ann_name] = inferred = ModelField.infer(
pydantic/fields.py:309: in infer
    return cls(
pydantic/fields.py:271: in __init__
    self.prepare()
pydantic/fields.py:345: in prepare
    self._type_analysis()
pydantic/fields.py:463: in _type_analysis
    self.type_ = self.type_.__args__[0]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = typing.List, attr = '__args__'

    def __getattr__(self, attr):
        # We are careful for copy and pickle.
        # Also for simplicity we just don't relay all dunder names
        if '__origin__' in self.__dict__ and not _is_dunder(attr):
            return getattr(self.__origin__, attr)
>       raise AttributeError(attr)
E       AttributeError: __args__

/usr/lib/python3.9/typing.py:640: AttributeError
________________________ test_generic_without_params_error ________________________

    def test_generic_without_params_error():
>       class Model(BaseModel):

tests/test_types.py:2193: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
pydantic/main.py:262: in __new__
    fields[ann_name] = inferred = ModelField.infer(
pydantic/fields.py:309: in infer
    return cls(
pydantic/fields.py:271: in __init__
    self.prepare()
pydantic/fields.py:345: in prepare
    self._type_analysis()
pydantic/fields.py:463: in _type_analysis
    self.type_ = self.type_.__args__[0]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = typing.List, attr = '__args__'

    def __getattr__(self, attr):
        # We are careful for copy and pickle.
        # Also for simplicity we just don't relay all dunder names
        if '__origin__' in self.__dict__ and not _is_dunder(attr):
            return getattr(self.__origin__, attr)
>       raise AttributeError(attr)
E       AttributeError: __args__

/usr/lib/python3.9/typing.py:640: AttributeError
================================ warnings summary =================================
.venv/lib/python3.9/site-packages/_pytest/config/__init__.py:1148
  /root/checked_repos/pydantic/.venv/lib/python3.9/site-packages/_pytest/config/__init__.py:1148: PytestConfigWarning: Unknown config ini key: timeout
  
    self._warn_or_fail_if_strict("Unknown config ini key: {}\n".format(key))

-- Docs: https://docs.pytest.org/en/stable/warnings.html
============================= short test summary info =============================
FAILED tests/test_edge_cases.py::test_dict_bare - AttributeError: __args__
FAILED tests/test_edge_cases.py::test_list_bare - AttributeError: __args__
FAILED tests/test_main.py::test_bare_type_type_validation_success - RuntimeError...
FAILED tests/test_main.py::test_bare_type_type_validation_fails - RuntimeError: ...
FAILED tests/test_main.py::test_none_min_max_items - AttributeError: __args__
FAILED tests/test_schema.py::test_unenforced_constraints_schema[kwargs8-type_8]
FAILED tests/test_schema.py::test_unparameterized_schema_generation - AttributeE...
FAILED tests/test_schema.py::test_frozen_set - AttributeError: __args__
FAILED tests/test_types.py::test_generic_without_params - AttributeError: __args__
FAILED tests/test_types.py::test_generic_without_params_error - AttributeError: ...
============= 10 failed, 1676 passed, 68 skipped, 1 warning in 9.43s ==============

[PrettyWood]

Hello @tirkarthi

As the release candidate just came out, I think noone has already worked on making pydantic compatible with python 3.9
I may have a look on it this weekend but if you or anybody else wants to work on it I think it would be great.
Your remark on __args__ makes me think about d86a184 by @hmvp, who already started to unify this and added the right comment 😄

which reduces the risk of breaking stuff on new versions

Maybe it could be worth cherry-picking it for a start and see what's missing