pandas.Index.groupby
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Index.groupby(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/0.24.2/reference/api/pandas.Index.groupby.html