Issues

Improve performance of v_complement

python/cpython#161127 · opened

on Nov 1, 2026

Regression in re.compile() performance

python/cpython#161125 · opened

on Nov 1, 2026

`asyncio.print_call_graph()` includes event loop frames when depth exceeds the task stack

python/cpython#161124 · opened

on Nov 1, 2026

Speed up `pprint` on deeply nested containers

python/cpython#161114 · opened

on Nov 1, 2026

`shutil.make_archive()` adds the zip archive to itself when it is inside the archived tree

python/cpython#161112 · opened

on Nov 1, 2026

`plistlib` binary writer leaves large formats in the `struct` cache

python/cpython#161106 · opened

on Nov 1, 2026

`HTTPConnection.set_tunnel()` host check runs before IDNA maps U+00A0 to a space

python/cpython#161104 · opened

on Nov 1, 2026

`ipaddress.IPv6Interface.is_unspecified` is False for IPv4-mapped `::ffff:0.0.0.0`

python/cpython#161100 · opened

on Nov 1, 2026

`asyncio.gather()` leaves stale `awaited_by` links when argument validation fails

python/cpython#161083 · opened

on Nov 1, 2026

3

PyObject_CopyData() copies wrong data, and can corrupt memory, when source and destination shapes differ and the source is not contiguous

python/cpython#161081 · opened

on Nov 1, 2026

1

What's New in 3.12 credits the unstable C API tier to PEP 697 instead of PEP 689

python/cpython#161078 · opened

on Nov 1, 2026

3

Fix "truthy"/"falsy" in documentation

python/cpython#161077 · opened

on Nov 1, 2026

asyncio: a failure in setsockopt(TCP_NODELAY) during transport creation leaves a zombie transport, so the fd is poisoned and Server.wait_closed() hangs

python/cpython#161076 · opened

on Nov 1, 2026

1

Optimize `long_bitwise`: eliminate temporary allocations for negative ints and fast-path non-negative ops

python/cpython#161075 · opened

on Nov 1, 2026

4

Windows: debug allocator failure during audit-hook cleanup

python/cpython#161074 · opened

on Nov 1, 2026

sqlite3: deadlock when threads share a connection that has Python callbacks

python/cpython#161065 · opened

on Nov 1, 2026

Crash on concurrent first read of Element.text or Element.tail on the free-threaded build

python/cpython#161062 · opened

on Nov 1, 2026

`xml.parsers.expat` crashes when `DefaultHandler` raises on a long non-UTF-8 token

python/cpython#161060 · opened

on Nov 1, 2026

`TextIOWrapper.tell()` returns a wrong position after `next()` and `flush()`

python/cpython#161055 · opened

on Nov 1, 2026

1

`TextIOWrapper.tell()` reads past the decoder snapshot after `seek()`

python/cpython#161053 · opened

on Nov 1, 2026

`tarfile` writes a member's old pax records after its name or other attributes are changed

python/cpython#161045 · opened

on Oct 31, 2026

pyrepl.pager: less detection is broken with less >= 706

python/cpython#161039 · opened

on Oct 31, 2026

asyncio: compute the event loop's clock resolution once, in `asyncio.constants`

python/cpython#161032 · opened

on Oct 31, 2026

winreg.ExpandEnvironmentStrings() passes the buffer size as the error code on failure

python/cpython#161021 · opened

on Oct 31, 2026

Heatmap replay shows zero duration and sample rate

python/cpython#161008 · opened

on Oct 31, 2026

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Issues

Improve performance of v_complement

Regression in re.compile() performance

`asyncio.print_call_graph()` includes event loop frames when depth exceeds the task stack

Speed up `pprint` on deeply nested containers

`shutil.make_archive()` adds the zip archive to itself when it is inside the archived tree

`plistlib` binary writer leaves large formats in the `struct` cache

`HTTPConnection.set_tunnel()` host check runs before IDNA maps U+00A0 to a space

`ipaddress.IPv6Interface.is_unspecified` is False for IPv4-mapped `::ffff:0.0.0.0`

`asyncio.gather()` leaves stale `awaited_by` links when argument validation fails

PyObject_CopyData() copies wrong data, and can corrupt memory, when source and destination shapes differ and the source is not contiguous

What's New in 3.12 credits the unstable C API tier to PEP 697 instead of PEP 689

Fix "truthy"/"falsy" in documentation

asyncio: a failure in setsockopt(TCP_NODELAY) during transport creation leaves a zombie transport, so the fd is poisoned and Server.wait_closed() hangs

Optimize `long_bitwise`: eliminate temporary allocations for negative ints and fast-path non-negative ops

Windows: debug allocator failure during audit-hook cleanup

sqlite3: deadlock when threads share a connection that has Python callbacks

Crash on concurrent first read of Element.text or Element.tail on the free-threaded build

`xml.parsers.expat` crashes when `DefaultHandler` raises on a long non-UTF-8 token

`TextIOWrapper.tell()` returns a wrong position after `next()` and `flush()`

`TextIOWrapper.tell()` reads past the decoder snapshot after `seek()`

`tarfile` writes a member's old pax records after its name or other attributes are changed

pyrepl.pager: less detection is broken with less >= 706

asyncio: compute the event loop's clock resolution once, in `asyncio.constants`

winreg.ExpandEnvironmentStrings() passes the buffer size as the error code on failure

Heatmap replay shows zero duration and sample rate