Mark Dickinson <dicki...@gmail.com> added the comment:

So this can happen only if grouping is [0] (or an equivalent iterable).  
Since this is an invalid grouping, I think the appropriate response would 
be for _grouping_intervals([0]) to raise an exception (which is what it 
currently does as soon as you iterate over the result, though this is 
possibly not by design. :)

Vincent, does the attached patch (_grouping_intervals.patch, against py3k) 
silence the pylint warning?

----------
nosy: +marketdickinson
Added file: http://bugs.python.org/file14627/_grouping_intervals.patch

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