MultiIndex.union()
pandas.MultiIndex.union
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MultiIndex.union(other)
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Form the union of two MultiIndex objects, sorting if possible
Parameters: other : MultiIndex or array / Index of tuples
Returns: Index
>>> index.union(index2)
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© 2008–2014 the pandas development team
Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.MultiIndex.union.html