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In [16]: from pandas.util.testing import makeCustomDataframe as mkdf ...: df= mkdf(10, 3) ...: df.columns = ['a','a','b'] ...: cols = ['b','a'] ...: df[['b','a']].columns Out[16]: Index([a, a, b], dtype=object)
expected to see
['b','a','a']
Once fixed, can relax format.py:CSVFormatter raising NotImplementedError() on cols selection with dupe columns, for the new engine only. see #3457 .
edit: #3509 removed that limitation from CSVFormatter