Issues

• Improve incomplete input detection

  type-bug
  python/cpython#159465 · Filter by author pablogsal opened on Oct 15, 2026

• Use C23/C++17 attributes

  topic-C-APItype-feature
  python/cpython#159464 · Filter by author encukou opened on Oct 15, 2026
  

• 3.16.0a1 freethreading-debug build on i686: test_destroy_subinterpreter_does_not_abort triggers assertion in mimalloc

  type-bug
  python/cpython#159462 · Filter by author befeleme opened on Oct 15, 2026

• _pyrepl: AssertionError in pos2xy when recalling long multi-line wide-character history

  type-bug
  python/cpython#159459 · Filter by author nsyhykui opened on Oct 15, 2026

• Free-threading: data race on static cache in _datetime.normalize_century()

  type-bug
  python/cpython#159458 · Filter by author AnnaAr321 opened on Oct 15, 2026
  1

• When performing the build of MSVC or MinGW .pyd, abi3t throws an error...... There is a conflict in the macro definition

  type-bug
  python/cpython#159457 · Filter by author Xiaozhi-Python-Road opened on Oct 15, 2026

• Tools/build/regen-configure.sh leaves a root-owned autom4te.cache, breaking later autoconf runs in the same tree

  buildtype-bug
  python/cpython#159452 · Filter by author sendaoYan opened on Oct 15, 2026

• AsyncIO thread-safety issue in Python 3.14's free-threading

  stdlibtopic-asynciotopic-free-threadingtype-bug
  python/cpython#159449 · Filter by author jblespiau opened on Oct 15, 2026
  2

• Reduce unnecessary work in FileIO

  extension-modulesperformancetopic-IOtype-refactor
  python/cpython#159446 · Filter by author cmaloney opened on Oct 15, 2026
  

• Avoid redundant garbage collector traversals

  3.16interpreter-coreperformancetype-feature
  python/cpython#159437 · Filter by author mfalco-oai opened on Oct 14, 2026
  3

  

• tarfile: a pax size record followed by a GNU long-name header makes tarfile duplicate, invent or skip members

  stdlibtype-bug
  python/cpython#159435 · Filter by author gpshead opened on Oct 14, 2026
  1

• Function __annotations__ can cache a stale result from __annotate__

  interpreter-coretype-bug
  python/cpython#159434 · Filter by author nascheme opened on Oct 14, 2026
  1

• _PyObject_XDecRefDelayed() should handle immortal objects

  interpreter-coretopic-free-threadingtype-bug
  python/cpython#159431 · Filter by author nascheme opened on Oct 14, 2026

• Some missing error checks on _PyObject_LookupSpecial in bytes and weakref

  interpreter-coretype-bug
  python/cpython#159430 · Filter by author msullivan opened on Oct 14, 2026

• Don't load from mimetypes.knownfiles by default on Windows

  stdlibtype-bugtype-security
  python/cpython#159428 · Filter by author sethmlarson opened on Oct 14, 2026

• test_free_threading.test_zlib fails on s390x with hardware zlib accelerator

  stdlibtests
  python/cpython#159425 · Filter by author vstinner opened on Oct 14, 2026

• test_readline fails with libeditline+musl

  3.14extension-modulestype-bug
  python/cpython#159424 · Filter by author rossburton opened on Oct 14, 2026

• Fix possible dataloss during finalization with GzipFile

  stdlibtype-bug
  python/cpython#159422 · Filter by author brittanyrey opened on Oct 14, 2026

• 3.16.0a1: test_build_details is not ready for --with-build-details-suffix configure option

  teststype-bug
  python/cpython#159420 · Filter by author befeleme opened on Oct 14, 2026

• forkserver throws a TypeError if default SIGINT handler is not used

  stdlibtopic-multiprocessingtype-bug
  python/cpython#159418 · Filter by author itrowbri opened on Oct 14, 2026

• Segfault on re-entrant lazy import pandas

  interpreter-coretopic-lazy-importstype-crash
  python/cpython#159408 · Filter by author inoa-jboliveira opened on Oct 14, 2026
  1

• SystemExit in asyncio task raises noisy warnings

  stdlibtopic-asynciotype-bug
  python/cpython#159401 · Filter by author marcan opened on Oct 14, 2026
  6

• Free-threading: codecs.encode() crashes when a codec search function is unregistered concurrently

  interpreter-coretopic-free-threadingtype-crash
  python/cpython#159399 · Filter by author christianaurichzm opened on Oct 14, 2026

• test_profiling.test_sampling_profiler: Assertion failed: maxchar <= 0x10ffff on ARM64 Raspbian 3.x

  extension-modulestopic-profilingtype-bug
  python/cpython#159398 · Filter by author vstinner opened on Oct 14, 2026
  

• pathlib fast-copy can silently produce an empty destination after a zero-byte syscall

  stdlibtopic-pathlibtype-bug
  python/cpython#159395 · Filter by author mhatipog opened on Oct 14, 2026