[issue3439] create a numbits() method for int and long types

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Ooops, you're right! (15).numbits() -> 4 and (16).numbits() -> 5. I'm 
tired.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3439>
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