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To: python-list@python.org
From: Serhiy Storchaka <storchaka@gmail.com>
Subject: Re: bit count or bit set && Python3
Date: Thu, 25 Oct 2012 22:07:45 +0300
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Xref: csiph.com comp.lang.python:32155

Chris Angelico's suggestion:

 >>> bitcount = bytes(bin(i).count("1") for i in range(256))
 >>> t = Timer('sum(number.to_bytes((number.bit_length() + 7) // 8,'
... '"little").translate(bitcount))',
... setup='from __main__ import bitcount; number=2**10001-1')
 >>> min(t.repeat(number=10000, repeat=7))