[docs] [issue23695] idiom for clustering a data series into n-length groups

[Paddy McCarthy]

Paddy McCarthy added the comment:

Hmmm. It seems that the problem isn't to do with the fact that it works, or how to apply it; the problem is with *how* it works. 

Making it an idiom means that too many will use it without knowing why it works which could lead to later maintenance issues. I think a better description of how it works may be needed for the docs.

Unfortunately my description of the how at http://paddy3118.blogspot.co.uk/2012/12/that-grouping-by-zipiter-trick-explained.html was not written with the docs in mind, but you are welcome to any part or the whole, for the Python docs.

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<http://bugs.python.org/issue23695>
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