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

[Zooko O'Whielacronx]

Zooko O'Whielacronx <zooko at zooko.com> added the comment:

There is a small mistake in the docs:

def bit_length(x):
    'Number of bits necessary to represent self in binary.'
    s = bin(x)          # binary representation:  bin(-37) --> '-0b100101'
    s = s.lstrip('-0b') # remove leading zeros and minus sign
    return len(s)       # len('100101') --> 6

is probably supposed to be:

def bit_length(x):
    'Number of bits necessary to represent x in binary.'
    s = bin(x)          # binary representation:  bin(-37) --> '-0b100101'
    s = s.lstrip('-0b') # remove leading zeros and minus sign
    return len(s)       # len('100101') --> 6

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nosy: +zooko

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