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Showing content from https://pandas.pydata.org/pandas-docs/stable/reference/api/../api/pandas.MultiIndex.append.html below:

pandas.MultiIndex.append — pandas 2.3.1 documentation

Append a collection of Index options together.

>>> mi = pd.MultiIndex.from_arrays([['a'], ['b']])
>>> mi
MultiIndex([('a', 'b')],
           )
>>> mi.append(mi)
MultiIndex([('a', 'b'), ('a', 'b')],
           )

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