DatetimeIndex.union_many()

pandas.DatetimeIndex.union_many

DatetimeIndex.union_many(others): A bit of a hack to accelerate unioning a collection of indexes

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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.DatetimeIndex.union_many.html