Issues

Datetime docs on determining tz-awareness can be simplified with utcoffset method

python/cpython#160035 · opened

on Oct 21, 2026

statistics.variance() can return a negative result for data containing infinity

python/cpython#160034 · opened

on Oct 21, 2026

2

wave.Wave_write.setparams() rejects valid PCM-to-IEEE-float parameter changes

python/cpython#160030 · opened

on Oct 21, 2026

CookieJar.add_cookie_header() is linear in the number of stored domains

python/cpython#160027 · opened

on Oct 21, 2026

`generate-build-details.py --relative-paths --config-file-path` writes wrong paths

python/cpython#160004 · opened

on Oct 21, 2026

`zlib._ZlibDecompressor(zdict=...)` raises `SystemError` on a zlib-wrapped stream

python/cpython#160001 · opened

on Oct 21, 2026

`LZMADecompressor.decompress(b'', max_length=0)` raises `LZMAError` on the second consecutive call

python/cpython#160000 · opened

on Oct 21, 2026

`BZ2Decompressor` and `zlib._ZlibDecompressor` set `needs_input=True` while output is still buffered

python/cpython#159999 · opened

on Oct 21, 2026

PEP 739 `build-details.json` points `libpython.dynamic` at a nonexistent path in framework builds

python/cpython#159998 · opened

on Oct 21, 2026

multiprocessing.managers proxy finalizer can deadlock a manager server running in the same process

python/cpython#159986 · opened

on Oct 20, 2026

Soft keyword highlighting issues on continuation lines

python/cpython#159973 · opened

on Oct 20, 2026

`ThreadPoolExecutor` tasks see the context of whichever `submit()` call started their worker thread

python/cpython#159964 · opened

on Oct 20, 2026

3

3.15 regression: concurrent first imports can fail or hang without any import cycle

python/cpython#159963 · opened

on Oct 20, 2026

JIT frames for PEP-523 consumers can't report deferred references

python/cpython#159961 · opened

on Oct 20, 2026

Update bundled pip to 26.2.2

python/cpython#159894 · opened

on Oct 20, 2026

Migrate pyexpat from API deprecated in Expat 2.9.0

python/cpython#159893 · opened

on Oct 20, 2026

1

Support multi-statement prompts in PDB REPL

python/cpython#159887 · opened

on Oct 20, 2026

2

run_with_limited_c_stack(size=...) is unsafe below Py_C_STACK_SIZE on platforms without stack-size detection

python/cpython#159879 · opened

on Oct 20, 2026

1

C stack limit detection is disabled on musl, so deep C recursion crashes instead of raising RecursionError

python/cpython#159876 · opened

on Oct 20, 2026

1

asyncio: after an SSL connection is lost, `transport.close()` leaves a transport whose `write()`, `set_protocol()`, … raise `AttributeError`

python/cpython#159875 · opened

on Oct 20, 2026

collections.UserString.startswith() and endswith() reject UserString arguments

python/cpython#159868 · opened

on Oct 20, 2026

profiling.sampling: exception mode drops samples from blocked handlers

python/cpython#159865 · opened

on Oct 20, 2026

email: set_content() raises AttributeError for memoryview with 7bit, 8bit or binary CTE

python/cpython#159858 · opened

on Oct 20, 2026

Shell `python3-config` prints empty or wrong paths when its installation path contains spaces

python/cpython#159819 · opened

on Oct 20, 2026

Do not leave stale OpenSSL errors in `_hashlib`

python/cpython#159815 · opened

on Oct 19, 2026

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Issues

Datetime docs on determining tz-awareness can be simplified with utcoffset method

statistics.variance() can return a negative result for data containing infinity

wave.Wave_write.setparams() rejects valid PCM-to-IEEE-float parameter changes

CookieJar.add_cookie_header() is linear in the number of stored domains

`generate-build-details.py --relative-paths --config-file-path` writes wrong paths

`zlib._ZlibDecompressor(zdict=...)` raises `SystemError` on a zlib-wrapped stream

`LZMADecompressor.decompress(b'', max_length=0)` raises `LZMAError` on the second consecutive call

`BZ2Decompressor` and `zlib._ZlibDecompressor` set `needs_input=True` while output is still buffered

PEP 739 `build-details.json` points `libpython.dynamic` at a nonexistent path in framework builds

multiprocessing.managers proxy finalizer can deadlock a manager server running in the same process

Soft keyword highlighting issues on continuation lines

`ThreadPoolExecutor` tasks see the context of whichever `submit()` call started their worker thread

3.15 regression: concurrent first imports can fail or hang without any import cycle

JIT frames for PEP-523 consumers can't report deferred references

Update bundled pip to 26.2.2

Migrate pyexpat from API deprecated in Expat 2.9.0

Support multi-statement prompts in PDB REPL

run_with_limited_c_stack(size=...) is unsafe below Py_C_STACK_SIZE on platforms without stack-size detection

C stack limit detection is disabled on musl, so deep C recursion crashes instead of raising RecursionError

asyncio: after an SSL connection is lost, `transport.close()` leaves a transport whose `write()`, `set_protocol()`, … raise `AttributeError`

collections.UserString.startswith() and endswith() reject UserString arguments

profiling.sampling: exception mode drops samples from blocked handlers

email: set_content() raises AttributeError for memoryview with 7bit, 8bit or binary CTE

Shell `python3-config` prints empty or wrong paths when its installation path contains spaces

Do not leave stale OpenSSL errors in `_hashlib`