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[API/ERR]: Better error message on unstack with non-unique index names #6729

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TomAugspurger opened this issue Mar 28, 2014 · 0 comments · Fixed by #6849
Closed

[API/ERR]: Better error message on unstack with non-unique index names #6729

TomAugspurger opened this issue Mar 28, 2014 · 0 comments · Fixed by #6849
Labels
Error Reporting Incorrect or improved errors from pandas Reshaping Concat, Merge/Join, Stack/Unstack, Explode
Milestone
0.14.0

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@TomAugspurger
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df = pd.DataFrame([1,1], index=pd.MultiIndex.from_tuples([('a', 'a'), ('a', 'b')], names=['i1', 'i1']))

In [5]: df.unstack('i1')

...

KeyError: 'Level i1 not found'

I can do a PR later.

Should also probably be a ValueError instead of a KeyError.
@TomAugspurger TomAugspurger changed the title [ERR]: Better error message on unstack with non-unique index names [API/ERR]: Better error message on unstack with non-unique index names Mar 28, 2014
@TomAugspurger TomAugspurger mentioned this issue Mar 29, 2014
Closed
@jreback jreback added this to the 0.14.0 milestone Apr 5, 2014
TomAugspurger pushed a commit to TomAugspurger/pandas that referenced this issue Apr 9, 2014
API/BUG Raise ValueError when stacking nonunique levels
6f79116 
Should raise a ValueError when (un)stacking a DataFrame
on a nonunique level. Previous behavior was to raise
a KeyError (not deliberately). Closes pandas-dev#6729.
@TomAugspurger TomAugspurger mentioned this issue Apr 9, 2014
Closed
TomAugspurger pushed a commit to TomAugspurger/pandas that referenced this issue Apr 9, 2014
API/BUG Raise ValueError when stacking nonunique levels
4b35ff0 
Should raise a ValueError when (un)stacking a DataFrame
on a nonunique level. Previous behavior was to raise
a KeyError (not deliberately). Closes pandas-dev#6729.
@TomAugspurger TomAugspurger mentioned this issue Apr 9, 2014
Merged
jeffreystarr pushed a commit to jeffreystarr/pandas that referenced this issue Apr 28, 2014
@jeffreystarr
API/BUG Raise ValueError when stacking nonunique levels
9821b13 
Should raise a ValueError when (un)stacking a DataFrame
on a nonunique level. Previous behavior was to raise
a KeyError (not deliberately). Closes pandas-dev#6729.
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Error Reporting Incorrect or improved errors from pandas Reshaping Concat, Merge/Join, Stack/Unstack, Explode
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Milestone
0.14.0
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@jreback @TomAugspurger