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Adding columns in groupby #2112

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wesm opened this issue Oct 24, 2012 · 1 comment
Closed

Adding columns in groupby #2112

wesm opened this issue Oct 24, 2012 · 1 comment
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@wesm
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wesm commented Oct 24, 2012

Possible to simplify?

xref http://stackoverflow.com/questions/12389898/python-pandas-how-to-add-a-totally-new-column-to-a-data-frame-inside-of-a-group
@jorisvandenbossche jorisvandenbossche modified the milestones: Someday, No action Jul 6, 2018
@jreback jreback modified the milestones: No action, Someday Jul 8, 2018
@jreback jreback added the Groupby label Jul 8, 2018
@rhshadrach
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The SO posts are adding columns to the DataFrame in groupby(...).apply and groupby(...).transform. In general, mutating a container while iterating over it invalidates the iterators, this shouldn't be allowed, similar to #12653.

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@wesm @jreback @jorisvandenbossche @rhshadrach