Issues

• io: TextIOWrapper silently corrupts output when encoder is a no-op

  type-bug
  python/cpython#161518 · Filter by author grgalex opened on Nov 6, 2026

• test_gdb is skipped on some GitHub Action CIs

  teststype-bug
  python/cpython#161517 · Filter by author vstinner opened on Nov 6, 2026
  1

• platform: import _wmi on first use

  OS-windowsperformancestdlibtype-feature
  python/cpython#161513 · Filter by author azchohfi opened on Nov 6, 2026

• mimetypes: reading the Windows registry through HKEY_CLASSES_ROOT is slow

  extension-modulesOS-windowsperformancetype-feature
  python/cpython#161512 · Filter by author azchohfi opened on Nov 6, 2026

• Windows venv python.exe starts a second process; could the launcher run the interpreter in-process?

  OS-windowsperformancetype-feature
  python/cpython#161511 · Filter by author azchohfi opened on Nov 6, 2026

• Windows: avoid importing encodings._win_cp_codecs and time at startup

  OS-windowsperformancestdlibtype-feature
  python/cpython#161510 · Filter by author azchohfi opened on Nov 6, 2026

• ssl.get_server_certificate(addr, ca_certs=...) verifies the chain but never the identity

  3.113.123.133.143.153.16stdlibtopic-SSLtype-security
  python/cpython#161503 · Filter by author brettcs opened on Nov 6, 2026

• python -m asyncio pstree loses nodes on Task → Future → Task chains

  stdlibtopic-asynciotype-bug
  python/cpython#161502 · Filter by author deadlovelll opened on Nov 6, 2026

• Count adjacent transpositions in "Did you mean" suggestions

  interpreter-coretype-feature
  python/cpython#161498 · Filter by author moontc opened on Nov 6, 2026
  1

• pure-Python suggestion fallback differs from the C implementation

  stdlibtype-bug
  python/cpython#161495 · Filter by author moontc opened on Nov 6, 2026

• Fix a typo in test test_str.py

  teststype-bug
  python/cpython#161492 · Filter by author samitistfobos-dev opened on Nov 6, 2026

• test_concurrent_gi_frame is flaky under --parallel-threads: the reader thread may never run its loop body

  teststopic-free-threadingtype-bug
  python/cpython#161489 · Filter by author thalesmourabh opened on Nov 6, 2026

• test_email: content-shadow header tuple is discarded in test_message.py

  teststopic-emailtype-bug
  python/cpython#161479 · Filter by author PavlNekrasov opened on Nov 6, 2026

• zlib, gzip, lzma and zstd decompression in 3.15: slower on macOS and Windows, and the process footprint grows on macOS (bisected to f262297)

  extension-modulesperformancetype-bug
  python/cpython#161478 · Filter by author maikschulze opened on Nov 6, 2026

• idlelib: stray comma makes __repr__ format a one-element tuple

  stdlibtopic-IDLEtype-bug
  python/cpython#161477 · Filter by author PavlNekrasov opened on Nov 6, 2026
  1

• ctypes: structures with float arrays returned by value are wrong on Linux SPARC

  extension-modulestopic-ctypestype-bug
  python/cpython#161475 · Filter by author shalseth opened on Nov 6, 2026

• Fix signed char handling in SSL record header version

  extension-modulestopic-SSLtype-bug
  python/cpython#161472 · Filter by author samitistfobos-dev opened on Nov 6, 2026

• ctypes: SIGSEGV when subscripting a pointer type without _type_

  extension-modulestopic-ctypestype-crash
  python/cpython#161471 · Filter by author PavlNekrasov opened on Nov 6, 2026

• Consider enabling tail call interpreter for sre_lib.h

  extension-modulesperformancetopic-regextype-feature
  python/cpython#161469 · Filter by author sobolevn opened on Nov 6, 2026
  2

• The hot attribute is not enabled when building CPython with Clang's default configuration

  buildperformancetype-feature
  python/cpython#161467 · Filter by author chenshanzhi opened on Nov 6, 2026

• Centralize I/O tests

  teststopic-IOtype-refactor
  python/cpython#161458 · Filter by author cmaloney opened on Nov 6, 2026
  

• Freeing a deeply nested list segfaults after resource.setrlimit(RLIMIT_STACK)

  extension-modulesinterpreter-coretype-crash
  python/cpython#161456 · Filter by author NekoAsakura opened on Nov 6, 2026
  

• python -m random N prints a float for an integer N <= 0

  stdlibtype-bug
  python/cpython#161452 · Filter by author andresdelfino opened on Nov 5, 2026

• Adapt tkinter and IDLE tests to the upcoming Tcl/Tk releases

  3.143.153.16teststopic-IDLEtopic-tkintertype-bug
  python/cpython#161441 · Filter by author serhiy-storchaka opened on Nov 5, 2026

• Show which tuple item is unhashable when a nested dict key or set element is rejected

  interpreter-coretype-feature
  python/cpython#161433 · Filter by author WakaTaira opened on Nov 5, 2026