How to use __init_subclass__ method in pandera

Best Python code snippet using pandera_python

test_subclassinit.py

Source:test_subclassinit.py Github

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...4class Test(unittest.TestCase):5 def test_init_subclass(self):6 class A:7 initialized = False8 def __init_subclass__(cls):9 super().__init_subclass__()10 cls.initialized = True11 class B(A):12 pass13 self.assertFalse(A.initialized)14 self.assertTrue(B.initialized)15 def test_init_subclass_dict(self):16 class A(dict):17 initialized = False18 def __init_subclass__(cls):19 super().__init_subclass__()20 cls.initialized = True21 class B(A):22 pass23 self.assertFalse(A.initialized)24 self.assertTrue(B.initialized)25 def test_init_subclass_kwargs(self):26 class A:27 def __init_subclass__(cls, **kwargs):28 cls.kwargs = kwargs29 class B(A, x=3):30 pass31 self.assertEqual(B.kwargs, dict(x=3))32 def test_init_subclass_error(self):33 class A:34 def __init_subclass__(cls):35 raise RuntimeError36 with self.assertRaises(RuntimeError):37 class B(A):38 pass39 def test_init_subclass_wrong(self):40 class A:41 def __init_subclass__(cls, whatever):42 pass43 with self.assertRaises(TypeError):44 class B(A):45 pass46 def test_init_subclass_skipped(self):47 class BaseWithInit:48 def __init_subclass__(cls, **kwargs):49 super().__init_subclass__(**kwargs)50 cls.initialized = cls51 class BaseWithoutInit(BaseWithInit):52 pass53 class A(BaseWithoutInit):54 pass55 self.assertIs(A.initialized, A)56 self.assertIs(BaseWithoutInit.initialized, BaseWithoutInit)57 def test_init_subclass_diamond(self):58 class Base:59 def __init_subclass__(cls, **kwargs):60 super().__init_subclass__(**kwargs)61 cls.calls = []62 class Left(Base):63 pass64 class Middle:65 def __init_subclass__(cls, middle, **kwargs):66 super().__init_subclass__(**kwargs)67 cls.calls += [middle]68 class Right(Base):69 def __init_subclass__(cls, right="right", **kwargs):70 super().__init_subclass__(**kwargs)71 cls.calls += [right]72 class A(Left, Middle, Right, middle="middle"):73 pass74 self.assertEqual(A.calls, ["right", "middle"])75 self.assertEqual(Left.calls, [])76 self.assertEqual(Right.calls, [])77 def test_set_name(self):78 class Descriptor:79 def __set_name__(self, owner, name):80 self.owner = owner81 self.name = name82 class A:83 d = Descriptor()84 self.assertEqual(A.d.name, "d")85 self.assertIs(A.d.owner, A)86 def test_set_name_metaclass(self):87 class Meta(type):88 def __new__(cls, name, bases, ns):89 ret = super().__new__(cls, name, bases, ns)90 self.assertEqual(ret.d.name, "d")91 self.assertIs(ret.d.owner, ret)92 return 093 class Descriptor:94 def __set_name__(self, owner, name):95 self.owner = owner96 self.name = name97 class A(metaclass=Meta):98 d = Descriptor()99 self.assertEqual(A, 0)100 def test_set_name_error(self):101 class Descriptor:102 def __set_name__(self, owner, name):103 1/0104 with self.assertRaises(RuntimeError) as cm:105 class NotGoingToWork:106 attr = Descriptor()107 exc = cm.exception108 self.assertRegex(str(exc), r'\bNotGoingToWork\b')109 self.assertRegex(str(exc), r'\battr\b')110 self.assertRegex(str(exc), r'\bDescriptor\b')111 self.assertIsInstance(exc.__cause__, ZeroDivisionError)112 def test_set_name_wrong(self):113 class Descriptor:114 def __set_name__(self):115 pass116 with self.assertRaises(RuntimeError) as cm:117 class NotGoingToWork:118 attr = Descriptor()119 exc = cm.exception120 self.assertRegex(str(exc), r'\bNotGoingToWork\b')121 self.assertRegex(str(exc), r'\battr\b')122 self.assertRegex(str(exc), r'\bDescriptor\b')123 self.assertIsInstance(exc.__cause__, TypeError)124 def test_set_name_lookup(self):125 resolved = []126 class NonDescriptor:127 def __getattr__(self, name):128 resolved.append(name)129 class A:130 d = NonDescriptor()131 self.assertNotIn('__set_name__', resolved,132 '__set_name__ is looked up in instance dict')133 def test_set_name_init_subclass(self):134 class Descriptor:135 def __set_name__(self, owner, name):136 self.owner = owner137 self.name = name138 class Meta(type):139 def __new__(cls, name, bases, ns):140 self = super().__new__(cls, name, bases, ns)141 self.meta_owner = self.owner142 self.meta_name = self.name143 return self144 class A:145 def __init_subclass__(cls):146 cls.owner = cls.d.owner147 cls.name = cls.d.name148 class B(A, metaclass=Meta):149 d = Descriptor()150 self.assertIs(B.owner, B)151 self.assertEqual(B.name, 'd')152 self.assertIs(B.meta_owner, B)153 self.assertEqual(B.name, 'd')154 def test_set_name_modifying_dict(self):155 notified = []156 class Descriptor:157 def __set_name__(self, owner, name):158 setattr(owner, name + 'x', None)159 notified.append(name)...

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