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RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas versionReshapingConcat, Merge/Join, Stack/Unstack, ExplodeConcat, Merge/Join, Stack/Unstack, Explode
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DataFrame.columns.get_indexer fails if there are duplicate column names.
pandas/pandas/core/reshape/melt.py
Line 109 in 05552d3
idx = frame.columns.get_indexer(id_vars + value_vars) |
This is really unfortunate -- melting should handle such cases
id value value
id1 2 3
should go to
id1 2
id1 3
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RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas versionReshapingConcat, Merge/Join, Stack/Unstack, ExplodeConcat, Merge/Join, Stack/Unstack, Explode