[issue26002] make statistics.median_grouped more efficient

[Raymond Hettinger]

Raymond Hettinger added the comment:

This code looks good and will certainly reduce the number of comparisons in non-trivial cases.

FWIW, It looks like the index functions are lifted directly from the bisect docs.

Steven, any objections?

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nosy: +rhettinger
stage:  -> patch review
versions:  -Python 3.5

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