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Mon Feb 17 12:47:19 CET 2014 · https://mail.python.org/pipermail/python-dev/2014-February/132409.html

17.02.14 13:14, M.-A. Lemburg написав(ла):
> Here's a particularly nasty case:
>
>>>> l = [(1, None), (2, None)]
>>>> l.sort()
>>>> l
> [(1, None), (2, None)]
>
>>>> l = [(1, None), (2, None), (3, 4)]
>>>> l.sort()
>>>> l
> [(1, None), (2, None), (3, 4)]
>
>>>> l = [(1, None), (2, None), (3, 4), (2, 3)]
>>>> l.sort()
> Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
> TypeError: unorderable types: int() < NoneType()

If you replace None to another value that cannot be compared with int 
(e.g. string), you will got the same nasty case.

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[Python-Dev] python 3 niggle: None < 1 raises TypeError