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How to use __class_getitem__ method in pandera

Best Python code snippet using pandera_python

test_genericclass.py

Source:test_genericclass.py

...138class TestClassGetitem(unittest.TestCase):139    def test_class_getitem(self):140        getitem_args = []141        class C:142            def __class_getitem__(*args, **kwargs):143                getitem_args.extend([args, kwargs])144                return None145        C[int, str]146        self.assertEqual(getitem_args[0], (C, (int, str)))147        self.assertEqual(getitem_args[1], {})148    def test_class_getitem(self):149        class C:150            def __class_getitem__(cls, item):151                return f'C[{item.__name__}]'152        self.assertEqual(C[int], 'C[int]')153        self.assertEqual(C[C], 'C[C]')154    def test_class_getitem_inheritance(self):155        class C:156            def __class_getitem__(cls, item):157                return f'{cls.__name__}[{item.__name__}]'158        class D(C): ...159        self.assertEqual(D[int], 'D[int]')160        self.assertEqual(D[D], 'D[D]')161    def test_class_getitem_inheritance_2(self):162        class C:163            def __class_getitem__(cls, item):164                return 'Should not see this'165        class D(C):166            def __class_getitem__(cls, item):167                return f'{cls.__name__}[{item.__name__}]'168        self.assertEqual(D[int], 'D[int]')169        self.assertEqual(D[D], 'D[D]')170    def test_class_getitem_classmethod(self):171        class C:172            @classmethod173            def __class_getitem__(cls, item):174                return f'{cls.__name__}[{item.__name__}]'175        class D(C): ...176        self.assertEqual(D[int], 'D[int]')177        self.assertEqual(D[D], 'D[D]')178    def test_class_getitem_patched(self):179        class C:180            def __init_subclass__(cls):181                def __class_getitem__(cls, item):182                    return f'{cls.__name__}[{item.__name__}]'183                cls.__class_getitem__ = classmethod(__class_getitem__)184        class D(C): ...185        self.assertEqual(D[int], 'D[int]')186        self.assertEqual(D[D], 'D[D]')187    def test_class_getitem_with_builtins(self):188        class A(dict):189            called_with = None190            def __class_getitem__(cls, item):191                cls.called_with = item192        class B(A):193            pass194        self.assertIs(B.called_with, None)195        B[int]196        self.assertIs(B.called_with, int)197    def test_class_getitem_errors(self):198        class C_too_few:199            def __class_getitem__(cls):200                return None201        with self.assertRaises(TypeError):202            C_too_few[int]203        class C_too_many:204            def __class_getitem__(cls, one, two):205                return None206        with self.assertRaises(TypeError):207            C_too_many[int]208    def test_class_getitem_errors_2(self):209        class C:210            def __class_getitem__(cls, item):211                return None212        with self.assertRaises(TypeError):213            C()[int]214        class E: ...215        e = E()216        e.__class_getitem__ = lambda cls, item: 'This will not work'217        with self.assertRaises(TypeError):218            e[int]219        class C_not_callable:220            __class_getitem__ = "Surprise!"221        with self.assertRaises(TypeError):222            C_not_callable[int]223    def test_class_getitem_metaclass(self):224        class Meta(type):225            def __class_getitem__(cls, item):226                return f'{cls.__name__}[{item.__name__}]'227        self.assertEqual(Meta[int], 'Meta[int]')228    def test_class_getitem_metaclass_2(self):229        class Meta(type):230            def __getitem__(cls, item):231                return 'from metaclass'232        class C(metaclass=Meta):233            def __class_getitem__(cls, item):234                return 'from __class_getitem__'235        self.assertEqual(C[int], 'from metaclass')236@support.cpython_only237class CAPITest(unittest.TestCase):238    def test_c_class(self):239        from _testcapi import Generic, GenericAlias240        self.assertIsInstance(Generic.__class_getitem__(int), GenericAlias)241        IntGeneric = Generic[int]242        self.assertIs(type(IntGeneric), GenericAlias)243        self.assertEqual(IntGeneric.__mro_entries__(()), (int,))244        class C(IntGeneric):245            pass246        self.assertEqual(C.__bases__, (int,))247        self.assertEqual(C.__orig_bases__, (IntGeneric,))248        self.assertEqual(C.__mro__, (C, int, object))249if __name__ == "__main__":...

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