pandas.Index.join

final Index.join(other, *, how='left', level=None, return_indexers=False, sort=False)[source]

Compute join_index and indexers to conform data structures to the new index.

Parameters:
otherIndex
how{‘left’, ‘right’, ‘inner’, ‘outer’}
levelint or level name, default None
return_indexersbool, default False
sortbool, default False

Sort the join keys lexicographically in the result Index. If False, the order of the join keys depends on the join type (how keyword).

Returns:
join_index, (left_indexer, right_indexer)