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

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Oops, forgot one part of the doc definition in the proposed additional
tests:

for x in range(-65000, 65000):
    k = x.numbits()
    assert k == len(bin(x).lstrip('-0b'))
    if x > 0:
        assert 2 ** (k-1) <= x < 2**k
        assert k == 1 + math.floor(math.log(x) / math.log(2))
    elif x == 0:
        assert k == 0
    else:
        assert k == (-x).numbits()

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