[issue13340] list.index does not accept None as start or stop

[Petri Lehtinen]

Petri Lehtinen <petri at digip.org> added the comment:

Committed a fix for both list and tuple. I considered this a bug fix rather than a new feature based on discussion in #11828, especially msg133532, and applied the fix to 2.7 and 3.2, too.

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<http://bugs.python.org/issue13340>
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