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

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

> There's still the question whether {list,tuple}.index() should accept None or not.

The API should not be changed for Py2.7 and Py3.2.  Those changesets should be reverted.

For Py3.3, it is open to discussion, but we probably don't need the change (making every other implementation also change for nearly zero benefit).

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