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Showing content from https://github.com/pandas-dev/pandas/issues/10115 below:

MultiIndex.drop_duplicates() drops names · Issue #10115 · pandas-dev/pandas · GitHub

In [12]: import pandas as pd

In [13]: mi = pd.MultiIndex.from_tuples([('A','a',1), ('A','a',2)],
                                        names=['Upper','Lower','Num'])

In [14]: mi.drop_duplicates()
Out[14]:
MultiIndex(levels=[['A'], ['a'], [1, 2]],
           labels=[[0, 0], [0, 0], [0, 1]])

In [16]: mi.names
Out[16]: FrozenList(['Upper', 'Lower', 'Num'])

In [18]: mi.drop_duplicates().names
Out[18]: FrozenList([None, None, None])

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