API/BUG Raise ValueError when stacking nonunique levels #6849
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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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This replaces my PR #6738 because I don't know how to git. |
TomAugspurger
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Apr 9, 2014
API/BUG Raise ValueError when stacking nonunique levels
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Should raise a ValueError when (un)stacking a DataFrame
on a nonunique level. Previous behavior was to raise
a KeyError (not deliberately). Closes #6729.