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

[Todd Rovito]

Todd Rovito added the comment:

This patch is for Python 2.7.

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versions: +Python 2.7
Added file: http://bugs.python.org/file27626/DataModel__len__2point7.patch

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