modin.pandas.Index.union¶

Index.union(other: Any, sort: bool = False) → Index[source]¶

Form the union of two Index objects.

If the Index objects are incompatible, both Index objects will be cast to dtype(‘object’) first.

Parameters:

• other (Index or array-like) –

• sort (bool or None, default None) –

  Whether to sort the resulting Index.

  • None : Sort the result, except when

    1. self and other are equal.

    2. self or other has length 0.

    3. Some values in self or other cannot be compared. A RuntimeWarning is issued in this case.

  • False : do not sort the result.

  • True : Sort the result (which may raise TypeError).

Returns:

The Index that represents the union between the two indexes

Return type:

Index

Examples

Union matching dtypes

CopyExpand

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

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Union mismatched dtypes

CopyExpand

>>> idx1 = pd.Index(['a', 'b', 'c', 'd'])
>>> idx2 = pd.Index([1, 2, 3, 4])
>>> idx1.union(idx2)
Index(['a', 'b', 'c', 'd', 1, 2, 3, 4], dtype='object')

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