Mark Shannon added the comment:
There seems to be an ongoing confusion about scopes on this thread.
The __class__ variable used by super() is a non-local variable in the scope of
any function using super(), whereas the __class__ used to define the type of an
object is a class attribute like any other special attribute e.g. __add__.
The cause of the bug is presumably that the (ast-to-bytecode) compiler fails to
differentiate the scopes.
See below for (rather ugly) code which correctly implements the example class
presented by Micheal.
class X(object):
@property
def __class__(self):
return int
class Y
def __init__(self):
super(X, self).__init__()
X.__init__ = Y.__init__
del Y
print (isinstance(X(), int))
>>> X.__init__.__code__.co_freevars[0]
'__class__'
>>> X.__dict__['__class__']
<property object at 0x18f5e68>
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Python tracker <[email protected]>
<http://bugs.python.org/issue12370>
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