bpo-35838: document optionxform must be idempotent by methane · Pull Request #12656 · python/cpython
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@@ -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 Expand Down
.. 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 Expand Down