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Most pandas operations return copies of the ``Series``/``DataFrame``. To make the changes "stick",
you'll need to either assign to a new variable:
.. code-block:: python
sorted_df = df.sort_values("col1")
or overwrite the original one:
.. code-block:: python
df = df.sort_values("col1")
.. note::
You will see an ``inplace=True`` keyword argument available for some methods:
.. code-block:: python
df.sort_values("col1", inplace=True)
Its use is discouraged. :ref:`More information. <indexing.view_versus_copy>`
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