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

[Todd Rovito]

Todd Rovito added the comment:

Changed the file name so it is clear that this patch goes with version 3.4.

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

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