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Apr 12, 2023
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gh-67230: add quoting rules to csv module #29469

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bpo-23041: update proposed changes to csv module.
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Update csv.rst 
Improve descriptions of QUOTE_NOTNULL and QUOTE_STRINGS with writer objects. Add descriptions for reader objects.
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@samwyse
samwyse authored Apr 11, 2023
commit d2337816ce9251056a242cf4ddb971a656940791
18 changes: 12 additions & 6 deletions Doc/library/csv.rst
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Expand Up @@ -327,7 +327,7 @@ The :mod:`csv` module defines the following constants:

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

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


.. data:: QUOTE_NONE
Expand All @@ -342,14 +342,20 @@ The :mod:`csv` module defines the following constants:
.. data:: QUOTE_NOTNULL

Instructs :class:`writer` objects to quote all fields which are not
``None``. If a field value is ``None`` an empty (unquoted) string
is written.
``None``. This is similar to QUOTE_ALL, except that if a
field value is ``None`` an empty (unquoted) string is written.

Instructs :class:`reader` to interpret an empty (unquoted) field as None, and
otherwise behave as QUOTE_ALL.

.. data:: QUOTE_STRINGS

Instructs :class:`writer` quotes are always placed around fields
which are strings. Note that ``None`` will be written as a
bar (unquoted) empty string.
Instructs :class:`writer` objects to always place quotes around fields
which are strings. This is similar to QUOTE_NONNUMERIC, except that if a
field value is ``None`` an empty (unquoted) string is written.

Instructs :class:`reader` to interpret an empty (unquoted) string as None, and
otherwise behave as QUOTE_NONNUMERIC.

The :mod:`csv` module defines the following exception:

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