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For context this respects the descriptor protocol:
>>> a()
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "<stdin>", line 4, in __call__
AttributeError: go away
Mind you, this is legal use:
>>> class B:
... @property
... def __call__(self):
... return lambda: 1
...
>>> b = B()
>>> b()
1