John Belmonte <j...@neggie.net> added the comment:
> Just a comment, (1) is analogous to str. iter('abc') gives only 'a', 'b' and
> 'c', while contains accepts '', 'ab', 'bc', and 'abc' too. At least in my
> mind, it's a pretty strong analogy.
I don't agree. The "zero" bit does not exist, so having __contains__ return
True on `Foo(0) in x` is misaligned with the iterator. And having __contains__
return True for specific compound values just because they happen to be
explicitly defined, while returning False for others, is arbitrary.
__contains__ seems to be of very little use, and moreover a trap for the
unwary. Assuming we have to live with that until Python 4, it's better to make
an explicit iterator like `bits()` so that the API doesn't contradict itself.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38250>
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