https://github.com/python/cpython/commit/e814f43f2c655b931af8ee9e1c128bd1027549fb
commit: e814f43f2c655b931af8ee9e1c128bd1027549fb
branch: main
author: Serhiy Storchaka <storch...@gmail.com>
committer: serhiy-storchaka <storch...@gmail.com>
date: 2025-06-02T23:31:06+03:00
summary:
gh-74232: Add a note about roundtrip of non-float numerics in CSV (GH-134963)
files:
M Doc/library/csv.rst
diff --git a/Doc/library/csv.rst b/Doc/library/csv.rst
index 533cdf13974be6..5297be17bd708e 100644
--- a/Doc/library/csv.rst
+++ b/Doc/library/csv.rst
@@ -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::
@@ -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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