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- python 2 only, not reproducible on python 3
Attached file makes an extension module which just returns PyIter_Check value on passed object.
Calling the function with an object of type "instance" returns true, even though the object is not iterator:
 >>> import spam
 >>> class Foo:
 ... pass
 ... 
 >>> foo = Foo()
 >>> type(foo)
 <type 'instance'>
 >>> spam.isiter(foo) # <<<< ?!
 1
 >>> next(foo)
 TypeError: instance has no next() method