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bpo-35838: document optionxform must be idempotent #12656

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Apr 2, 2019
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bpo-35838: document optionxform must be idempotent #12656

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bpo-35838: document optionxform must be idempotent
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@methane
methane committed Apr 2, 2019
commit 7dfda7ffda5093d6e5927d8cd20241bbf71b5245
6 changes: 6 additions & 0 deletions Doc/library/configparser.rst
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Expand Up @@ -721,6 +721,12 @@ 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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