[issue19362] Documentation for len() fails to mention that it works on sets

[Gareth Rees]

Gareth Rees added the comment:

I considered suggesting "container", but the problem is that "container" is used elsewhere to mean "object supporting the 'in' operator" (in particular, collections.abc.Container has a __contains__ method but no __len__ method).

The abstract base class for "object with a length" is collections.abc.Sized, but I don't think using the term "sized" would be clear to users.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19362>
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