Kent Johnson wrote: > But why doesn't Foo.__call__ shadow type.__call__? Normally an instance > attribute takes precedence over a class attribute. Is it something > special about how function call syntax is handled internally, or do all > special methods work this way, or is there something else going on?
New-style classes look up special methods on the class, not on the instance: >>> class Foo(object): ... def __invert__(self): ... return 'foo' ... >>> x = Foo() >>> ~x 'foo' >>> x.__invert__ = 123 >>> x.__invert__() Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: 'int' object is not callable >>> ~x # equivalent to type(x).__invert__() 'foo' -- http://mail.python.org/mailman/listinfo/python-list
