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Notes about unique vs cat.categories #12278 #12421

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12 changes: 12 additions & 0 deletions doc/source/categorical.rst
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Expand Up @@ -182,6 +182,18 @@ It's also possible to pass in the categories in a specific order:
indicate an ordered ``Categorical``.


.. note::

The result of ``Series.unique()`` is not always the same as ``Series.cat.categories``,
because ``Series.unique()`` has a couple of guarantees, namely that it returns categories
in the order of appearance, and it only includes values that are actually present.

.. ipython:: python

s = pd.Series(list('babc')).astype('category', categories=list('abcd'))
s.unique()
s.cat.categories

Renaming categories
~~~~~~~~~~~~~~~~~~~

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