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Merge 'types.UnionType' with <code>typing._UnionGenericAlias</code>, not <code>typing.Union</code>

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

release-blocker

topic-typing

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#137065 In python/cpython;

· serhiy-storchaka opened on Jul 24, 2025

Documentation indicates presence of removed <code>ast</code> members

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#137063 In python/cpython;

· SnoopJ opened on Jul 24, 2025

DTrace Build Fails on NetBSD

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

buildThe build process and cross-buildThe build process and cross-build

OS-netbsd

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#137056 In python/cpython;

· furkanonder opened on Jul 23, 2025

Emscripten build fails with Python 3.14

3.14bugs and security fixesbugs and security fixes

docsDocumentation in the Doc dirDocumentation in the Doc dir

OS-emscripten

Status: Open.

#137025 In python/cpython;

· treyhunner opened on Jul 22, 2025

The C analyzer seems to fail when <code>--disable-gil</code> is set

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

topic-free-threading

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#136952 In python/cpython;

· ZeroIntensity opened on Jul 21, 2025

Solve HMAC one-shot digest limitations

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

stdlibPython modules in the Lib dirPython modules in the Lib dir

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#136912 In python/cpython;

· picnixz opened on Jul 21, 2025

Inconsisten handling of non-ASCII characters in encodings.normalize_encoding()

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

stdlibPython modules in the Lib dirPython modules in the Lib dir

topic-unicode

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#136736 In python/cpython;

· serhiy-storchaka opened on Jul 17, 2025

<code>test_free_threading.test_monitoring</code> flaky (occasional reference leak)

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

testsTests in the Lib/test dirTests in the Lib/test dir

topic-free-threading

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#136692 In python/cpython;

· colesbury opened on Jul 15, 2025

concurrent.interpreters queue documentation doesn't match reality

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

docsDocumentation in the Doc dirDocumentation in the Doc dir

stdlibPython modules in the Lib dirPython modules in the Lib dir

topic-subinterpreters

Status: Open.

#136563 In python/cpython;

· da-woods opened on Jul 12, 2025

<code>unittest</code> may incorrectly return exit code 5 when <code>setUpClass</code> raises an exception

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

stdlibPython modules in the Lib dirPython modules in the Lib dir

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#136442 In python/cpython;

· ueshin opened on Jul 9, 2025

_SelectorSocketTransport.writelines does not protect against connection lost

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

stdlibPython modules in the Lib dirPython modules in the Lib dir

topic-asyncio

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#136234 In python/cpython;

· bmerry opened on Jul 3, 2025

3.14 is missing a bytecode line number for one-line conditionals

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#136190 In python/cpython;

· nedbat opened on Jul 1, 2025