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GH-46853: [Python][Docs] Document preserving leading zeros in CSV #50477

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GH-46853: [Python][Docs] Document preserving leading zeros in CSV #50477

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12 changes: 12 additions & 0 deletions docs/source/python/csv.rst
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Expand Up @@ -142,6 +142,18 @@ a :class:`ConvertOptions` instance and pass it to :func:`read_csv`:
col1: [[1,2,3]]
col2: [["a","b","c"]]

Quoted CSV values are still subject to type inference. To preserve formatting
such as leading zeros, set the column type explicitly to ``string``:

.. code-block:: python

>>> import io
>>> source = io.BytesIO(b'code\n"001"\n"002"\n')
>>> options = csv.ConvertOptions(column_types={'code': pa.string()})
>>> table = csv.read_csv(source, convert_options=options)
>>> table['code'].to_pylist()
['001', '002']

.. note::
To assign a column as ``duration``, the CSV values must be numeric strings
that match the expected unit (e.g. ``60000`` for 60 seconds when
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