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pandas.Index.where

Index.where(self, cond, other=None) [source]

Return an Index of same shape as self and whose corresponding entries are from self where cond is True and otherwise are from other.

New in version 0.19.0.

Parameters:
cond : boolean array-like with the same length as self
other : scalar, or array-like
Returns:
Index

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Licensed under the 3-clause BSD License.
https://pandas.pydata.org/pandas-docs/version/0.25.0/reference/api/pandas.Index.where.html