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bpo-27497: Add return value to csv.DictWriter.writeheader (GH-12306)

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csv.DictWriter.writeheader() now returns the return value of the
underlying csv.Writer.writerow() method.

Patch contributed by Ashish Nitin Patil.
This commit is contained in:
Rémi Lapeyre 2019-05-10 03:50:11 +02:00 • committed by Victor Stinner
parent d237b3f0f6
commit fce5ff1e18
4 changed files with 18 additions and 3 deletions
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Doc/library/csv.rst
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@ -443,7 +443,8 @@ read CSV files (assuming they support complex numbers at all).
.. method:: csvwriter.writerow(row)
Write the *row* parameter to the writer's file object, formatted according to
the current dialect.
the current dialect. Return the return value of the call to the *write* method
of the underlying file object.
.. versionchanged:: 3.5
Added support of arbitrary iterables.
@ -467,9 +468,14 @@ DictWriter objects have the following public method:
.. method:: DictWriter.writeheader()
Write a row with the field names (as specified in the constructor).
Write a row with the field names (as specified in the constructor) to
the writer's file object, formatted according to the current dialect. Return
the return value of the :meth:`csvwriter.writerow` call used internally.
.. versionadded:: 3.2
.. versionchanged:: 3.8
:meth:`writeheader` now also returns the value returned by
the :meth:`csvwriter.writerow` method it uses internally.
.. _csv-examples: