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10 changes: 7 additions & 3 deletions Doc/library/codecs.rst
Original file line number Diff line number Diff line change
Expand Up @@ -159,9 +159,13 @@ function:
.. function:: register(search_function)

Register a codec search function. Search functions are expected to take one
argument, being the encoding name in all lower case letters, and return a
:class:`CodecInfo` object. In case a search function cannot find
a given encoding, it should return ``None``.
argument, being the encoding name in all lower case letters with hyphens
and spaces converted to underscores, and return a :class:`CodecInfo` object.
In case a search function cannot find a given encoding, it should return
``None``.

.. versionchanged:: 3.9
Hyphens and spaces are converted to underscore.

.. note::

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