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DOC: Update groupby.rst #36238

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Update groupby.rst
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DOC: Update groupby.rst
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8 changes: 3 additions & 5 deletions doc/source/user_guide/groupby.rst
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Expand Up @@ -87,11 +87,9 @@ The mapping can be specified many different ways:
* A Python function, to be called on each of the axis labels.
* A list or NumPy array of the same length as the selected axis.
* A dict or ``Series``, providing a ``label -> group name`` mapping.
* For ``DataFrame`` objects, a string indicating a column to be used to group.
Of course ``df.groupby('A')`` is just syntactic sugar for
``df.groupby(df['A'])``, but it makes life simpler.
* For ``DataFrame`` objects, a string indicating an index level to be used to
group.
* For ``DataFrame`` objects, a string indicating either a column name or
an index level name to be used to group.
* ``df.groupby('A')`` is just syntactic sugar for ``df.groupby(df['A'])``.
* A list of any of the above things.

Collectively we refer to the grouping objects as the **keys**. For example,
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