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I thought this should print "False", why is it printing "True"?
>>> class Foo(object):
... def __bool__(self):
... return False
...
>>> f = Foo()
>>> if f:
... print "True"
... else:
... print "False"
...
True
>>>
You should define
__nonzero__()in Python 2.x. It was only renamed to__bool__()in Python 3.x. (The name__nonzero__()actually predates the introduction of thebooltype by many years.)