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

[STINNER Victor]

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

Please don't promote this ugly code "len(bin(x).lstrip('-0b'))". It's 
not the best way to compute the number of bits... I prefer fredrikj's 
proposition (with // 2, few people understand >> 1).

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