8000 BUG: Groupby selection context not being properly reset by christopherzimmerman · Pull Request #28541 · pandas-dev/pandas · GitHub
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BUG: Groupby selection context not being properly reset #28541

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BUG: Groupby selection context not being properly reset #28541

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b5f01b7
Added failing test for groupby mutation
christopherzimmerman Sep 19, 2019
1dbb12d
Switched implementation to use _group_selection_context
christopherzimmerman Sep 19, 2019
bcab4a0
added whatsnew entry
christopherzimmerman Sep 19, 2019
ca26b64
updated test, removed last instance of not using context manager to f…
christopherzimmerman Sep 20, 2019
c4b0a53
Merge branch 'master' of https://github.com/christopherzimmerman/pand…
christopherzimmerman Oct 21, 2019
7a9e1d1
Rebase from master
christopherzimmerman Oct 21, 2019
f24c05c
Missed a merge
christopherzimmerman Oct 21, 2019
5cc3cb1
Fixed two tests
christopherzimmerman Oct 21, 2019
3050963
Another context needed to be set
christopherzimmerman Oct 21, 2019
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added whatsnew entry
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@christopherzimmerman
christopherzimmerman committed Sep 19, 2019
commit bcab4a0726ec528df5f38b998b6dc8a5c29a0d3d
1 change: 1 addition & 0 deletions doc/source/whatsnew/v1.0.0.rst
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Expand Up @@ -240,6 +240,7 @@ Groupby/resample/rolling
- Bug in :meth:`DataFrame.rolling` not allowing for rolling over datetimes when ``axis=1`` (:issue: `28192`)
- Bug in :meth:`DataFrame.groupby` not offering selection by column name when ``axis=1`` (:issue:`27614`)
- Bug in :meth:`DataFrameGroupby.agg` not able to use lambda function with named aggregation (:issue:`27519`)
- Bug in :meth:`DataFrameGroupby` causing unexpected mutations of the groupby object (:issue:`28523`)
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I think the ref needs to be :class:`pandas.core.groupby.DataFrameGroupBy`. And maybe briefly explain the user-visible behavior: "Multiple operations on a DataFrameGroupBy object not giving the same results in certain cases".


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