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Docs: Describe csv.reader conversions for all quoting modes #158426

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7 changes: 4 additions & 3 deletions Doc/library/csv.rst
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Expand Up @@ -67,9 +67,10 @@ The :mod:`!csv` module defines the following functions:
dialect. For full details about the dialect and formatting parameters, see
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 :data:`QUOTE_NONNUMERIC` format
option is specified (in which case unquoted fields are transformed into floats).
By default, each row read from the csv file is returned as a list of strings.
The :data:`QUOTE_NONNUMERIC` and :data:`QUOTE_STRINGS` quoting options convert
non-empty unquoted fields to floats. The :data:`QUOTE_NOTNULL` and
:data:`QUOTE_STRINGS` options convert empty unquoted fields to ``None``.

A short usage example::

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