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82db5c81e0
Including the stochastic tests needed to guarantee sensitivity to the potential iterate-while-modifying hazard a naive implementation might have. Signed-off-by: Anson Mansfield <amansfield@mantaro.com>
68 lines
1.3 KiB
Python
68 lines
1.3 KiB
Python
class Descriptor:
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def __get__(self, obj, cls):
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print("get")
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print(type(obj) is Main)
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print(cls is Main)
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return "result"
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def __set__(self, obj, val):
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print("set")
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print(type(obj) is Main)
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print(val)
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def __delete__(self, obj):
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print("delete")
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print(type(obj) is Main)
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def __set_name__(self, owner, name):
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print("set_name", name)
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print(owner.__name__ == "Main")
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class Main:
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Forward = Descriptor()
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m = Main()
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try:
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m.__class__
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except AttributeError:
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# Target doesn't support __class__.
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print("SKIP")
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raise SystemExit
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r = m.Forward
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if "Descriptor" in repr(r.__class__):
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# Target doesn't support descriptors.
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print("SKIP")
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raise SystemExit
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# Test assignment and deletion.
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print(r)
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m.Forward = "a"
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del m.Forward
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# Test that lookup of descriptors like __get__ are not passed into __getattr__.
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class NonDescriptor:
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def __getattr__(self, attr):
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print("getattr", attr)
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class TestClass:
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non_descriptor = NonDescriptor()
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print(isinstance(TestClass().non_descriptor, NonDescriptor))
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t = TestClass()
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t.non_descriptor = 123
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print(t.non_descriptor)
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try:
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del TestClass().non_descriptor
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except AttributeError:
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print("AttributeError")
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