pandas.CategoricalIndex.union

CategoricalIndex.union(other)

Form the union of two Index objects and sorts if possible.

Parameters: other : Index or array-like
Returns: union : Index

Examples

>>> idx1 = pd.Index([1, 2, 3, 4])
>>> idx2 = pd.Index([3, 4, 5, 6])
>>> idx1.union(idx2)
Int64Index([1, 2, 3, 4, 5, 6], dtype='int64')

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https://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.CategoricalIndex.union.html