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The JIT's "pure" <code>_BINARY_OP</code> evaluation produces UB (and incorrect results)

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)

topic-JIT

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#136183 In python/cpython;

· brandtbucher opened on Jul 1, 2025

Missing unsafe keyword on unittest.mock.patch and unittest.mock.patch.object

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#136179 In python/cpython;

· leonarduschen opened on Jul 1, 2025

Alter ZipFile.data_offset calculation

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.

#136170 In python/cpython;

· danifus opened on Jul 1, 2025

<code>encodings</code> module is not documented

docsDocumentation in the Doc dirDocumentation in the Doc dir

stdlibPython modules in the Lib dirPython modules in the Lib dir

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#136162 In python/cpython;

· sobolevn opened on Jul 1, 2025

Optimize asyncio.to_thread to avoid contextvars.copy_context() overhead for empty contexts

performancePerformance or resource usagePerformance or resource usage

stdlibPython modules in the Lib dirPython modules in the Lib dir

topic-asyncio

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#136157 In python/cpython;

· heliang666s opened on Jul 1, 2025

Don't use O_EXCL when using O_TMPFILE

stdlibPython modules in the Lib dirPython modules in the Lib dir

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#136156 In python/cpython;

· TerryRPatterson opened on Jul 1, 2025

Docs: EPUB builds are broken

docsDocumentation in the Doc dirDocumentation in the Doc dir

triagedThe issue has been accepted as valid by a triager.The issue has been accepted as valid by a triager.

Status: Open.

#136155 In python/cpython;

· m-aciek opened on Jun 30, 2025

JIT global-to-constant promotion doesn't properly validate the globals dictionary at runtime

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)

topic-JIT

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

Status: Open.

#136154 In python/cpython;

· brandtbucher opened on Jun 30, 2025

ModuleNotFoundError: No module named 'test.support'

extension-modulesC modules in the Modules dirC modules in the Modules dir

topic-subinterpreters

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

Status: Open.

#136153 In python/cpython;

· killcoder opened on Jun 30, 2025

Define "standard library" and "stdlib" in the glossary

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#136145 In python/cpython;

· zware opened on Jun 30, 2025

Doc: Some broken links

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#136135 In python/cpython;

· LamentXU123 opened on Jun 30, 2025

SMTP.login() method fails with ValueError in environments that do not support MD5

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.

#136134 In python/cpython;

· ouldriw opened on Jun 30, 2025