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gh-138005: Document that CSV skipinitialspace=True and delimiter=' ' require quotation for empty fields #138006

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gh-138005: Document that CSV skipinitialspace=True and delimiter=' ' require quotation for empty fields #138006

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0df5388
typo
maurycy Aug 20, 2025
6e4b9a5
describe the behavior
maurycy Aug 20, 2025
3bf1d88
just one sentence
maurycy Aug 21, 2025
eb5ea6a
bring back trailing space
maurycy Aug 21, 2025
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5 changes: 3 additions & 2 deletions Doc/library/csv.rst
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Expand Up @@ -467,7 +467,8 @@ Dialects support the following attributes:
.. attribute:: Dialect.skipinitialspace

When :const:`True`, spaces immediately following the *delimiter* are ignored.
The default is :const:`False`.
The default is :const:`False`. When combining ``delimiter=' '`` with
``skipinitialspace=True``, unquoted empty fields are not allowed.


.. attribute:: Dialect.strict
Expand Down Expand Up @@ -636,7 +637,7 @@ done::
.. rubric:: Footnotes

.. [1] If ``newline=''`` is not specified, newlines embedded inside quoted fields
will not be interpreted correctly, and on platforms that use ``\r\n`` linendings
will not be interpreted correctly, and on platforms that use ``\r\n`` line endings
on write an extra ``\r`` will be added. It should always be safe to specify
``newline=''``, since the csv module does its own
(:term:`universal <universal newlines>`) newline handling.
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