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On traces of #33982 #35030

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2 changes: 1 addition & 1 deletion pandas/io/parsers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1654,7 +1654,7 @@ def _maybe_dedup_names(self, names):

def _maybe_make_multi_index_columns(self, columns, col_names=None):
# possibly create a column mi here
if _is_potential_multi_index(columns):
if _is_potential_multi_index(columns, self.index_col):
columns = MultiIndex.from_tuples(columns, names=col_names)
return columns

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