MultiIndex.join()
pandas.MultiIndex.join
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MultiIndex.join(other, how='left', level=None, return_indexers=False)[source] -
this is an internal non-public method
Compute join_index and indexers to conform data structures to the new index.
Parameters: other : Index
how : {‘left’, ‘right’, ‘inner’, ‘outer’}
level : int or level name, default None
return_indexers : boolean, default Fa
