https://github.com/python/cpython/commit/245cd6c53278006fa34fd7799d32f0884eb7e75d
commit: 245cd6c53278006fa34fd7799d32f0884eb7e75d
branch: main
author: Malcolm Smith <sm...@chaquo.com>
committer: methane <songofaca...@gmail.com>
date: 2025-05-03T10:20:10+09:00
summary:

gh-91156: Document how TextIOWrapper interacts with UTF-8 mode (GH-132885)

Document how TextIOWrapper interacts with UTF-8 mode

files:
M Doc/library/io.rst

diff --git a/Doc/library/io.rst b/Doc/library/io.rst
index fcd7afea3544dd..3aa2f35f05eba0 100644
--- a/Doc/library/io.rst
+++ b/Doc/library/io.rst
@@ -965,7 +965,8 @@ Text I/O
    :class:`TextIOBase`.
 
    *encoding* gives the name of the encoding that the stream will be decoded or
-   encoded with.  It defaults to :func:`locale.getencoding`.
+   encoded with.  In :ref:`UTF-8 Mode <utf8-mode>`, this defaults to UTF-8.
+   Otherwise, it defaults to :func:`locale.getencoding`.
    ``encoding="locale"`` can be used to specify the current locale's encoding
    explicitly. See :ref:`io-text-encoding` for more information.
 

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