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DEPR: observed=False default in groupby #51811

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merged 10 commits into from
Mar 17, 2023
Merged

DEPR: observed=False default in groupby #51811

merged 10 commits into from
Mar 17, 2023

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rhshadrach
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@rhshadrach rhshadrach commented Mar 7, 2023 •
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@rhshadrach rhshadrach added Groupby Categorical Categorical Data Type Deprecate Functionality to remove in pandas labels Mar 7, 2023
@rhshadrach rhshadrach added this to the 2.1 milestone Mar 7, 2023
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for users who work interaactively (ipython, jupyter,..), Is there way to avoid the FutureWarning coming repeatedly? It will probably get quite annoying after a while...

Otherwise LGTM.

@rhshadrach
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Thanks @topper-123

for users who work interaactively (ipython, jupyter,..), Is there way to avoid the FutureWarning coming repeatedly? It will probably get quite annoying after a while...

Users can specify observed=True|False. Also, just to be sure, this will only warn if one of the groupings is categorical.

I think you're thinking of some global option? I would be -1 on that, and hope this will be rare enough that it won't pester users. They'll need to specify observed=True if they want to adopt future behavior or observed=False if they want to maintain current behavior eventually.

mroeschke
mroeschke reviewed Mar 10, 2023
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doc/source/whatsnew/v2.1.0.rst Outdated
@@ -93,10 +93,10 @@ Other API changes
Deprecations
~~~~~~~~~~~~
- Deprecating pinning ``group.name`` to each group in :meth:`SeriesGroupBy.aggregate` aggregations; if your operation requires utilizing the groupby keys, iterate over the groupby object instead (:issue:`41090`)
- Deprecated the default of ``observed=False`` in :meth:`DataFrame.groupby` and :meth:`Series.groupby` (:issue:`43999`)
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Could you mention this will be True in the future?

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Good call - done.

@mroeschke mroeschke merged commit 0baa925 into pandas-dev:main Mar 17, 2023
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Thanks @rhshadrach

@rhshadrach rhshadrach deleted the depr_observed branch March 18, 2023 11:58
@j-bennet j-bennet mentioned this pull request Mar 23, 2023
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@rhshadrach rhshadrach mentioned this pull request Apr 22, 2023
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@mwaskom mwaskom mentioned this pull request Sep 2, 2023
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@rhshadrach rhshadrach mentioned this pull request Feb 10, 2024
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Categorical Categorical Data Type Deprecate Functionality to remove in pandas Groupby
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