[docs] [issue32709] the iterable for itertools.groupby must be sorted

[Stéphane Wirtel]

Stéphane Wirtel <stephane at wirtel.be> added the comment:

good catch, I only use itertools.groupby when I work for a collection.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32709>
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