1b89c503db
When descriptors are enabled, lookup of the `__get__`, `__set__` and `__delete__` descriptor methods should not be delegated to `__getattr__`. That follows CPython behaviour. Signed-off-by: Damien George <damien@micropython.org>
62 lines
1.1 KiB
Python
62 lines
1.1 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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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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