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73 lines
1.4 KiB
Python
73 lines
1.4 KiB
Python
class A:
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pass
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class B(A):
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pass
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assert issubclass(A, A)
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assert issubclass(B, A)
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assert not issubclass(A, B)
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class MCNotSubClass(type):
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def __subclasscheck__(self, subclass):
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return False
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class NotSubClass(metaclass=MCNotSubClass):
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pass
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class InheritedNotSubClass(NotSubClass):
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pass
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assert not issubclass(A, NotSubClass)
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assert not issubclass(NotSubClass, NotSubClass)
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assert not issubclass(InheritedNotSubClass, NotSubClass)
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assert not issubclass(NotSubClass, InheritedNotSubClass)
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class MCAlwaysSubClass(type):
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def __subclasscheck__(self, subclass):
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return True
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class AlwaysSubClass(metaclass=MCAlwaysSubClass):
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pass
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class InheritedAlwaysSubClass(AlwaysSubClass):
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pass
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assert issubclass(A, AlwaysSubClass)
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assert issubclass(AlwaysSubClass, AlwaysSubClass)
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assert issubclass(InheritedAlwaysSubClass, AlwaysSubClass)
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assert issubclass(AlwaysSubClass, InheritedAlwaysSubClass)
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class GenericInstance:
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def __subclasscheck__(self, _):
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return True
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assert issubclass(A, GenericInstance())
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assert issubclass(list, GenericInstance())
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assert issubclass([], GenericInstance())
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class MCAVirtualSubClass(type):
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def __subclasscheck__(self, subclass):
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return subclass is A
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class AVirtualSubClass(metaclass=MCAVirtualSubClass):
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pass
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assert issubclass(A, AVirtualSubClass)
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assert not isinstance(B, AVirtualSubClass)
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