[issue26002] make statistics.median_grouped more efficient

[Steven D'Aprano]

Steven D'Aprano added the comment:

Looks good to me.

I've run some quick timing tests, and for very small lists, there's no significant difference, but for larger lists I'm getting up to a 50% speedup. Nicely done, thank you.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26002>
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