https://github.com/python/cpython/commit/ffd7f2f231f5543e6863c6c85e86f72233229771
commit: ffd7f2f231f5543e6863c6c85e86f72233229771
branch: main
author: Stan Ulbrych <89152624+stanfromirel...@users.noreply.github.com>
committer: malemburg <m...@lemburg.com>
date: 2025-07-08T23:34:48+02:00
summary:
gh-136162: Document `encodings` package functions (#136164)
Closes #136162.
files:
M Doc/library/codecs.rst
M Doc/whatsnew/3.9.rst
diff --git a/Doc/library/codecs.rst b/Doc/library/codecs.rst
index b231fa568cf342..efe211cd2db6c8 100644
--- a/Doc/library/codecs.rst
+++ b/Doc/library/codecs.rst
@@ -1484,6 +1484,66 @@ mapping. It is not supported by :meth:`str.encode`
(which only produces
Restoration of the ``rot13`` alias.
+:mod:`encodings` --- Encodings package
+--------------------------------------
+
+.. module:: encodings
+ :synopsis: Encodings package
+
+This module implements the following functions:
+
+.. function:: normalize_encoding(encoding)
+
+ Normalize encoding name *encoding*.
+
+ Normalization works as follows: all non-alphanumeric characters except the
+ dot used for Python package names are collapsed and replaced with a single
+ underscore, leading and trailing underscores are removed.
+ For example, ``' -;#'`` becomes ``'_'``.
+
+ Note that *encoding* should be ASCII only.
+
+
+.. note::
+ The following functions should not be used directly, except for testing
+ purposes; :func:`codecs.lookup` should be used instead.
+
+
+.. function:: search_function(encoding)
+
+ Search for the codec module corresponding to the given encoding name
+ *encoding*.
+
+ This function first normalizes the *encoding* using
+ :func:`normalize_encoding`, then looks for a corresponding alias.
+ It attempts to import a codec module from the encodings package using either
+ the alias or the normalized name. If the module is found and defines a valid
+ ``getregentry()`` function that returns a :class:`codecs.CodecInfo` object,
+ the codec is cached and returned.
+
+ If the codec module defines a ``getaliases()`` function any returned aliases
+ are registered for future use.
+
+
+.. function:: win32_code_page_search_function(encoding)
+
+ Search for a Windows code page encoding *encoding* of the form ``cpXXXX``.
+
+ If the code page is valid and supported, return a :class:`codecs.CodecInfo`
+ object for it.
+
+ .. availability:: Windows.
+
+ .. versionadded:: 3.14
+
+
+This module implements the following exception:
+
+.. exception:: CodecRegistryError
+
+ Raised when a codec is invalid or incompatible.
+
+
:mod:`encodings.idna` --- Internationalized Domain Names in Applications
------------------------------------------------------------------------
diff --git a/Doc/whatsnew/3.9.rst b/Doc/whatsnew/3.9.rst
index 7fd9e6ac66e6c8..40d4a27bff9fee 100644
--- a/Doc/whatsnew/3.9.rst
+++ b/Doc/whatsnew/3.9.rst
@@ -1139,7 +1139,7 @@ Changes in the Python API
(Contributed by Christian Heimes in :issue:`36384`).
* :func:`codecs.lookup` now normalizes the encoding name the same way as
- :func:`!encodings.normalize_encoding`, except that :func:`codecs.lookup` also
+ :func:`encodings.normalize_encoding`, except that :func:`codecs.lookup` also
converts the name to lower case. For example, ``"latex+latin1"`` encoding
name is now normalized to ``"latex_latin1"``.
(Contributed by Jordon Xu in :issue:`37751`.)
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