[docs] Groupby([]).sum() dropping data

[Julien Palard]

Hi Serfer, thanks for reporting!

> I think there's a problem dropping/excluding data points with groupby.sum function

Sadly you're reporting the issue to the Python documentation mailing list, but your issues looks related to Pandas, and we're completly different team.

I bet you should not group by Count if you want to sum Count.

I think Stackoverflow or a Pandas user group may be better than the cpython documentation mailing list for thise usage questions.

Bests,
--
Julien Palard
https://mdk.fr
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