Issues

• _pyio.IOBase.readlines(hint) stops one line early when the total size read equals *hint*

  AI-needs-explanation
  python/cpython#161272 · Filter by author tsayin4 opened on Nov 3, 2026
  3

• _pyio.BufferedRandom.truncate() keeps the read buffer, so later reads return data that is no longer in the file

  AI-needs-explanation
  python/cpython#161271 · Filter by author tsayin4 opened on Nov 3, 2026
  3

• test_embed: four InitConfigTests tests are always skipped

  easyteststype-bug
  python/cpython#161270 · Filter by author NekoAsakura opened on Nov 3, 2026
  4

  

• Lazy from .sub import sub in a package is overwritten when the submodule is imported elsewhere

  interpreter-coretopic-lazy-importstype-bug
  python/cpython#161265 · Filter by author Lillecarl opened on Nov 3, 2026

• Tests which use MD5-based WWW-Authentication challenges fail on FIPS OpenSSL

  teststype-bug
  python/cpython#161263 · Filter by author sethmlarson opened on Nov 3, 2026

• test_pathlib.test_touch_common sometimes fails on Emscripten

  OS-emscriptenteststype-bug
  python/cpython#161262 · Filter by author deadlovelll opened on Nov 3, 2026

• statistics.correlation() is inaccurate for tiny inputs

  stdlibtype-bug
  python/cpython#161259 · Filter by author vmphase opened on Nov 3, 2026

• SIGCONT crashes code.interact() shells due to conflicting pyrepl UnixConsole init

  topic-repltype-bug
  python/cpython#161254 · Filter by author meshulam opened on Nov 3, 2026

• Improve performance of exceptions

  interpreter-coreperformancetype-feature
  python/cpython#161242 · Filter by author eendebakpt opened on Nov 3, 2026
  1

• Path.copy fails on filesystems where FICLONE returns EPERM instead of falling back

  stdlibtopic-pathlibtype-bug
  python/cpython#161241 · Filter by author dropps07 opened on Nov 3, 2026

• signalmodule.c in free-threaded Python

  extension-modulestopic-free-threadingtype-bug
  python/cpython#161235 · Filter by author johng opened on Nov 3, 2026
  1

• __lazy_import__: globals=None signature differs from explicit None behavior

  interpreter-coretopic-lazy-importstype-bug
  python/cpython#161229 · Filter by author youknowdot opened on Nov 3, 2026

• [C API] _PyTuple_Resize() must copy the tuple if the hash value was already computed

  topic-C-APItype-bug
  python/cpython#161226 · Filter by author vstinner opened on Nov 3, 2026
  4

• email.utils.encode_rfc2231() writes 'None' as the charset when only language is given

  stdlibtopic-emailtype-bug
  python/cpython#161222 · Filter by author andresdelfino opened on Nov 2, 2026

• regrtest: Accept -jN% to target system load percentage, adaptively if possible

  teststype-feature
  python/cpython#161204 · Filter by author zware opened on Nov 2, 2026
  

• Speed up finding line endings in TextIOWrapper

  extension-modulesperformancetype-feature
  python/cpython#161199 · Filter by author ptweezy opened on Nov 2, 2026

• CYGWIN: Python-3.16.0a1 doesn't select correct strerror_r()

  buildOS-unsupportedOS-windowstype-bug
  python/cpython#161198 · Filter by author carlo-bramini opened on Nov 2, 2026

• time.timezone, altzone and tzname are stale after a zone's rules change mid-year

  extension-modulestype-bug
  python/cpython#161194 · Filter by author nascheme opened on Nov 2, 2026

• Upgrade bundled Expat to 2.10.0 (e.g. for fixes to four vulnerabilities)

  3.113.123.133.143.153.16extension-modulestopic-XMLtype-security
  python/cpython#161192 · Filter by author hartwork opened on Nov 2, 2026
  

• [C API] Py_CLEAR(), Py_SETREF() and Py_XSETREF() memcpy() implementation is not safe with strict aliasing

  interpreter-coretopic-C-APItype-bug
  python/cpython#161185 · Filter by author vstinner opened on Nov 2, 2026
  

• Use a managed dict for the _io types

  extension-modulesperformancetopic-IOtype-feature
  python/cpython#161184 · Filter by author eendebakpt opened on Nov 2, 2026
  1

• [C API] Add Python PyUnicodeWriter API to the limited C API 3.16

  topic-C-APItype-refactor
  python/cpython#161172 · Filter by author vstinner opened on Nov 2, 2026

• Speed up calling an async function that doesn't suspend

  interpreter-coreperformancetype-feature
  python/cpython#161170 · Filter by author asvetlov opened on Nov 2, 2026

• asyncio.Task.print_stack() shows an incorrect exception location

  stdlibtopic-asynciotype-bug
  python/cpython#161166 · Filter by author deadlovelll opened on Nov 2, 2026

• Speed up ASCII str.lower() and str.upper() (2 to 4x at 1 KB)

  interpreter-coreperformancetype-feature
  python/cpython#161155 · Filter by author ptweezy opened on Nov 2, 2026
  4