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From: INADA Naoki <songofacandy@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: 0 equals False, was Re: (unknown)
Date: Wed, 23 Mar 2016 11:12:40 +0000
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Xref: csiph.com comp.lang.python:105540

Tips: Since True == 1, sum() can count Trues.

>>> def count_even(seq):
...     return sum(i%2 == 0 for i in seq)

>>> count_even(range(100))
50