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bpo-35838: document optionxform must be idempotent (GH-12656)

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methane committed Apr 2, 2019
1 parent e6a0e80 commit 04694a306b8f4ab54ef5fc4ba673c26fa53b0ac1
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  1. +6 −0 Doc/library/configparser.rst
@@ -721,6 +721,12 @@ be overridden by subclasses or by attribute assignment.
>>> list(custom['Section2'].keys())
.. 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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