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ENH: provide keyword to groupby to reindex by all possible indicies for a multi-index #3835

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jreback opened this issue Jun 10, 2013 · 5 comments
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ENH: provide keyword to groupby to reindex by all possible indicies for a multi-index #3835

jreback opened this issue Jun 10, 2013 · 5 comments
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API Design Groupby Ideas Long-Term Enhancement Discussions Indexing Related to indexing on series/frames, not to indexes themselves
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0.16.0

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@jreback
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jreback commented Jun 10, 2013

http://stackoverflow.com/questions/17027470/pandas-groupby-and-multiindex

not sure how useful this is....but say we provide dropna=True (which is the current behavior), but if dropna=False then can reindex by all the combinations of each index level as a reindexer...
@hayd
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hayd commented Jun 10, 2013

This would make for a much better solution for #3820.

@jreback
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jreback commented Jun 10, 2013

I think its the same op with 2 diff questions....but yes

@hayd
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hayd commented Jun 10, 2013

This one however: http://stackoverflow.com/questions/16994485/ensuring-the-cartesian-product-of-keys-appears-in-a-pandas-table

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hayd commented Jun 23, 2013

vaguely related #3999

@jreback jreback mentioned this issue Nov 1, 2013
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@jreback jreback modified the milestones: 0.15.0, 0.14.0 Feb 15, 2014
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jreback commented Jan 26, 2015

user can just use multiindex.from_product and reindex

@jreback jreback closed this as completed Jan 26, 2015
@mcwitt mcwitt mentioned this issue Mar 23, 2015
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