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

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

It should still be documented that __len__ can be used for this purpose.

The __length_hint__ attribute is mainly for iterators because they are
not allowed to have a __len__ as that would affect their boolean value.

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assignee:  -> georg.brandl
nosy: +georg.brandl
resolution: out of date -> 
status: closed -> open

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<http://bugs.python.org/issue1283110>
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