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[3.7] bpo-35838: document optionxform must be idempotent (GH-12656) #12657

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Merged
miss-islington merged 1 commit into from
Apr 2, 2019
Merged

[3.7] bpo-35838: document optionxform must be idempotent (GH-12656) #12657

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6 changes: 6 additions & 0 deletions Doc/library/configparser.rst
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Expand Up @@ -723,6 +723,12 @@ be overridden by subclasses or by attribute assignment.
>>> list(custom['Section2'].keys())
['AnotherKey']

.. note::
The optionxform function transforms option names to a canonical form.
This should be an idempotent function: if the name is already in
canonical form, it should be returned unchanged.


.. attribute:: ConfigParser.SECTCRE

A compiled regular expression used to parse section headers. The default
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