Message 65989 - Python tracker

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On Tue, Apr 29, 2008 at 10:36 PM, Guido van Rossum <guido@python.org> 
wrote:
..
>  Let's also fix __len__() so that it returns sys.{maxint,maxsize} when
>  the result doesn't fit in a Py_ssize_t.

http://mail.python.org/pipermail/python-3000/2008-April/013343.html

With attached patch given

class x:
    def __len__(self):
        return 2**100

len(x()) and len(range(2**100)) will return sys.maxsize.