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Issue #18219: Optimize csv.DictWriter for large number of columns.

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Patch by Mariatta Wijaya.
This commit is contained in:
INADA Naoki 2016-10-21 19:47:57 +09:00
parent 4510e6de9d
commit 0a421a28f8
4 changed files with 28 additions and 5 deletions
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10
Doc/library/csv.rst
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@ -195,10 +195,12 @@ The :mod:`csv` module defines the following classes:
written if the dictionary is missing a key in *fieldnames*. If the
dictionary passed to the :meth:`writerow` method contains a key not found in
*fieldnames*, the optional *extrasaction* parameter indicates what action to
take. If it is set to ``'raise'`` a :exc:`ValueError` is raised. If it is
set to ``'ignore'``, extra values in the dictionary are ignored. Any other
optional or keyword arguments are passed to the underlying :class:`writer`
instance.
take.
If it is set to ``'raise'``, the default value, a :exc:`ValueError`
is raised.
If it is set to ``'ignore'``, extra values in the dictionary are ignored.
Any other optional or keyword arguments are passed to the underlying
:class:`writer` instance.
Note that unlike the :class:`DictReader` class, the *fieldnames* parameter
of the :class:`DictWriter` is not optional. Since Python's :class:`dict`