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

[Todd Rovito]

Changes by Todd Rovito <rovitotv at gmail.com>:


Removed file: http://bugs.python.org/file27624/RightClickContextMenuUpdatedFor3point4.patch

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