8000 GH-133711: Enable UTF-8 mode by default (PEP 686) by AA-Turner · Pull Request #133712 · python/cpython · GitHub
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GH-133711: Enable UTF-8 mode by default (PEP 686) #133712

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Merged
merged 14 commits into from
Jul 15, 2025
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GH-133711: Enable UTF-8 mode by default (PEP 686) #133712

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fc19177
Enable UTF-8 mode by default (PEP 686)
AA-Turner May 8, 2025
c706cfa
Victor's documentation comments
AA-Turner May 10, 2025
f095ab0
Fix test_cmd_line
AA-Turner May 10, 2025
ff066b1
Improve What's New entry
AA-Turner May 10, 2025
abfb864
Add references to UTF-8 and Unicode
AA-Turner May 10, 2025
f40b986
Merge branch 'main' into utf-8-mode
AA-Turner May 10, 2025
3226e1d
Check stream buffer type in test_python_legacy_windows_stdio
AA-Turner May 10, 2025
b83c966
Merge branch 'main' into utf-8-mode
AA-Turner May 10, 2025
b56e01b
Merge branch 'main' into utf-8-mode
AA-Turner May 26, 2025
3da6bf2
line length
AA-Turner May 26, 2025
9b3ebf7
Merge branch 'main' into utf-8-mode
AA-Turner May 28, 2025
6ecea69
Update Doc/library/os.rst
vstinner Jul 13, 2025
e87ce6c
Update Include/cpython/initconfig.h
vstinner Jul 13, 2025
3130318
Merge branch 'main' into utf-8-mode
vstinner Jul 13, 2025
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Add references to UTF-8 and Unicode
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@AA-Turner
AA-Turner committed May 10, 2025
commit abfb86419453cdf837de5d5d18a17797cb3ed130
8 changes: 7 additions & 1 deletion 8 Doc/whatsnew/3.15.rst
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Expand Up @@ -75,9 +75,12 @@ New features
Other language changes
======================

* Python now uses UTF-8 as the default encoding, independent of the system's
* Python now uses UTF-8_ as the default encoding, independent of the system's
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You might mention the UTF-8 Mode earlier since it has other side effects documented in the UTF-8 Mode section, such as changing sys.stdout error handler and ignoring the locale encoding.

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"default encoding" is UTF-8 since Python 3.0. (e.g. sys.getdefaultencoding())

environment. This means that I/O operations without an explicit encoding,
e.g. ``open('flying-circus.txt')``, will use UTF-8.
UTF-8 is a widely-supported Unicode_ character encoding that has become a
*de facto* standard for representing text, including nearly every webpage
on the internet, many common file formats, programming languages, and more.

This only applies when no ``encoding`` argument is given. For best
compatibility between versions of Python, ensure that an explicit ``encoding``
Expand All @@ -92,6 +95,9 @@ Other language changes

.. seealso:: :pep:`686` for further details.

.. _UTF-8: https://en.wikipedia.org/wiki/UTF-8
.. _Unicode: https://home.unicode.org/

(Contributed by Adam Turner in :gh:`133711`; PEP 686 written by Inada Naoki.)

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