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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2Ž‰$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙimport types import unittest class Test(unittest.TestCase): def test_init_subclass(self): class A: initialized = False def __init_subclass__(cls): super().__init_subclass__() cls.initialized = True class B(A): pass self.assertFalse(A.initialized) self.assertTrue(B.initialized) def test_init_subclass_dict(self): class A(dict): initialized = False def __init_subclass__(cls): super().__init_subclass__() cls.initialized = True class B(A): pass self.assertFalse(A.initialized) self.assertTrue(B.initialized) def test_init_subclass_kwargs(self): class A: def __init_subclass__(cls, **kwargs): cls.kwargs = kwargs class B(A, x=3): pass self.assertEqual(B.kwargs, dict(x=3)) def test_init_subclass_error(self): class A: def __init_subclass__(cls): raise RuntimeError with self.assertRaises(RuntimeError): class B(A): pass def test_init_subclass_wrong(self): class A: def __init_subclass__(cls, whatever): pass with self.assertRaises(TypeError): class B(A): pass def test_init_subclass_skipped(self): class BaseWithInit: def __init_subclass__(cls, **kwargs): super().__init_subclass__(**kwargs) cls.initialized = cls class BaseWithoutInit(BaseWithInit): pass class A(BaseWithoutInit): pass self.assertIs(A.initialized, A) self.assertIs(BaseWithoutInit.initialized, BaseWithoutInit) def test_init_subclass_diamond(self): class Base: def __init_subclass__(cls, **kwargs): super().__init_subclass__(**kwargs) cls.calls = [] class Left(Base): pass class Middle: def __init_subclass__(cls, middle, **kwargs): super().__init_subclass__(**kwargs) cls.calls += [middle] class Right(Base): def __init_subclass__(cls, right="right", **kwargs): super().__init_subclass__(**kwargs) cls.calls += [right] class A(Left, Middle, Right, middle="middle"): pass self.assertEqual(A.calls, ["right", "middle"]) self.assertEqual(Left.calls, []) self.assertEqual(Right.calls, []) def test_set_name(self): class Descriptor: def __set_name__(self, owner, name): self.owner = owner self.name = name class A: d = Descriptor() self.assertEqual(A.d.name, "d") self.assertIs(A.d.owner, A) def test_set_name_metaclass(self): class Meta(type): def __new__(cls, name, bases, ns): ret = super().__new__(cls, name, bases, ns) self.assertEqual(ret.d.name, "d") self.assertIs(ret.d.owner, ret) return 0 class Descriptor: def __set_name__(self, owner, name): self.owner = owner self.name = name class A(metaclass=Meta): d = Descriptor() self.assertEqual(A, 0) def test_set_name_error(self): class Descriptor: def __set_name__(self, owner, name): 1/0 with self.assertRaises(RuntimeError) as cm: class NotGoingToWork: attr = Descriptor() exc = cm.exception self.assertRegex(str(exc), r'\bNotGoingToWork\b') self.assertRegex(str(exc), r'\battr\b') self.assertRegex(str(exc), r'\bDescriptor\b') self.assertIsInstance(exc.__cause__, ZeroDivisionError) def test_set_name_wrong(self): class Descriptor: def __set_name__(self): pass with self.assertRaises(RuntimeError) as cm: class NotGoingToWork: attr = Descriptor() exc = cm.exception self.assertRegex(str(exc), r'\bNotGoingToWork\b') self.assertRegex(str(exc), r'\battr\b') self.assertRegex(str(exc), r'\bDescriptor\b') self.assertIsInstance(exc.__cause__, TypeError) def test_set_name_lookup(self): resolved = [] class NonDescriptor: def __getattr__(self, name): resolved.append(name) class A: d = NonDescriptor() self.assertNotIn('__set_name__', resolved, '__set_name__ is looked up in instance dict') def test_set_name_init_subclass(self): class Descriptor: def __set_name__(self, owner, name): self.owner = owner self.name = name class Meta(type): def __new__(cls, name, bases, ns): self = super().__new__(cls, name, bases, ns) self.meta_owner = self.owner self.meta_name = self.name return self class A: def __init_subclass__(cls): cls.owner = cls.d.owner cls.name = cls.d.name class B(A, metaclass=Meta): d = Descriptor() self.assertIs(B.owner, B) self.assertEqual(B.name, 'd') self.assertIs(B.meta_owner, B) self.assertEqual(B.name, 'd') def test_set_name_modifying_dict(self): notified = [] class Descriptor: def __set_name__(self, owner, name): setattr(owner, name + 'x', None) notified.append(name) class A: a = Descriptor() b = Descriptor() c = Descriptor() d = Descriptor() e = Descriptor() self.assertCountEqual(notified, ['a', 'b', 'c', 'd', 'e']) def test_errors(self): class MyMeta(type): pass with self.assertRaises(TypeError): class MyClass(metaclass=MyMeta, otherarg=1): pass with self.assertRaises(TypeError): types.new_class("MyClass", (object,), dict(metaclass=MyMeta, otherarg=1)) types.prepare_class("MyClass", (object,), dict(metaclass=MyMeta, otherarg=1)) class MyMeta(type): def __init__(self, name, bases, namespace, otherarg): super().__init__(name, bases, namespace) with self.assertRaises(TypeError): class MyClass(metaclass=MyMeta, otherarg=1): pass class MyMeta(type): def __new__(cls, name, bases, namespace, otherarg): return super().__new__(cls, name, bases, namespace) def __init__(self, name, bases, namespace, otherarg): super().__init__(name, bases, namespace) self.otherarg = otherarg class MyClass(metaclass=MyMeta, otherarg=1): pass self.assertEqual(MyClass.otherarg, 1) def test_errors_changed_pep487(self): # These tests failed before Python 3.6, PEP 487 class MyMeta(type): def __new__(cls, name, bases, namespace): return super().__new__(cls, name=name, bases=bases, dict=namespace) with self.assertRaises(TypeError): class MyClass(metaclass=MyMeta): pass class MyMeta(type): def __new__(cls, name, bases, namespace, otherarg): self = super().__new__(cls, name, bases, namespace) self.otherarg = otherarg return self class MyClass(metaclass=MyMeta, otherarg=1): pass self.assertEqual(MyClass.otherarg, 1) def test_type(self): t = type('NewClass', (object,), {}) self.assertIsInstance(t, type) self.assertEqual(t.__name__, 'NewClass') with self.assertRaises(TypeError): type(name='NewClass', bases=(object,), dict={}) if __name__ == "__main__": unittest.main()