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Unexpected behavior with groupby on single-row dataframe? #11741

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dwyatte opened this issue Dec 2, 2015 · 3 comments
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Unexpected behavior with groupby on single-row dataframe? #11741

dwyatte opened this issue Dec 2, 2015 · 3 comments
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@dwyatte
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dwyatte commented Dec 2, 2015

Do single-row dataframes (not series) get special treatment in some way? It seems you can do arbitrary groupby operations on them on non-existent columns without errors.

df1 = pd.DataFrame(np.random.randn(1,4), columns=list('ABCD'))
df2 = pd.DataFrame(np.random.randn(2,4), columns=list('ABCD'))

In [3]: df1.groupby('asdf')
Out[3]: pandas.core.groupby.DataFrameGroupBy object at 0x1139acb10

In [4]: df2.groupby('asdf')
KeyError: 'asdf'
@nbonnotte
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Yeah, there is a problem. I discovered that while working on issue #11640

I've a PR ready

This was referenced Jan 16, 2016
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@nbonnotte
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Solved with PR #12063

@jreback jreback added this to the 0.18.0 milestone Jan 16, 2016
@jreback jreback added the Bug label Jan 16, 2016
@dwyatte
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dwyatte commented Jan 19, 2016

Great, thanks!

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@jreback @dwyatte @nbonnotte