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/pandas 0.25

pandas.Index.groupby

Index.groupby(self, values) [source]

Group the index labels by a given array of values.

Parameters:
values : array

Values used to determine the groups.

Returns:
groups : dict

{group name -> group labels}

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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.groupby.html