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[3.13] gh-74232: Add a note about roundtrip of non-float numerics in CSV (GH-134963) #135049

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Jun 2, 2025
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[3.13] gh-74232: Add a note about roundtrip of non-float numerics in CSV (GH-134963) #135049

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10 changes: 8 additions & 2 deletions Doc/library/csv.rst
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Expand Up @@ -70,7 +70,7 @@ The :mod:`csv` module defines the following functions:
section :ref:`csv-fmt-params`.

Each row read from the csv file is returned as a list of strings. No
automatic data type conversion is performed unless the ``QUOTE_NONNUMERIC`` format
automatic data type conversion is performed unless the :data:`QUOTE_NONNUMERIC` format
option is specified (in which case unquoted fields are transformed into floats).

A short usage example::
Expand Down Expand Up @@ -331,8 +331,14 @@ The :mod:`csv` module defines the following constants:

Instructs :class:`writer` objects to quote all non-numeric fields.

Instructs :class:`reader` objects to convert all non-quoted fields to type *float*.
Instructs :class:`reader` objects to convert all non-quoted fields to type :class:`float`.

.. note::
Some numeric types, such as :class:`bool`, :class:`~fractions.Fraction`,
or :class:`~enum.IntEnum`, have a string representation that cannot be
converted to :class:`float`.
They cannot be read in the :data:`QUOTE_NONNUMERIC` and
:data:`QUOTE_STRINGS` modes.

.. data:: QUOTE_NONE

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