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DOC: .groupby() aligns Series, accepts ndarray #15789

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DOC: .groupby() aligns Series, accepts ndarray #15789

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9 changes: 6 additions & 3 deletions pandas/core/generic.py
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Expand Up @@ -4129,11 +4129,14 @@ def groupby(self, by=None, axis=0, level=None, as_index=True, sort=True,

Parameters
----------
by : mapping function / list of functions, dict, Series, or tuple /
list of column names or index level names.
by : mapping function / list of functions, dict, Series, ndarray, \
or tuple / list of column names or index level names or \
Series or ndarrays
Called on each element of the object index to determine the groups.
If a dict or Series is passed, the Series or dict VALUES will be
used to determine the groups
used to determine the groups (the Series' values are first
aligned; see ``.align()`` method). If ndarray is passed, the
values as-is determine the groups.
axis : int, default 0
level : int, level name, or sequence of such, default None
If the axis is a MultiIndex (hierarchical), group by a particular
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