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

[Todd Rovito]

Todd Rovito added the comment:

For Python 3.4 attached is a patch as suggested by Raymond Hettinger.  My suggestion is to put the patch in Doc/reference/datamodel.rst because if a user searches google.com for __len__ this is the first link in the list.  I think this extra information is a valuable addition to the documentation.

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keywords: +patch
nosy: +Todd.Rovito
versions: +Python 3.4
Added file: http://bugs.python.org/file27589/DataModel__len__.patch

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