[issue1283110] Give __len__() advice for "don't know"

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

If iterators don't want their boolean value to be messed up, couldn't
they simply use __bool__ for that?

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nosy: +pitrou

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1283110>
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