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Cpython v3.15.0b4

Cpython: v3.15.0b4 Release

Release date:
July 18, 2026
Previous version:
v3.15.0b3 (released June 23, 2026)
Magnitude:
4,592 Diff Delta
Contributors:
8 total committers
Data confidence:
Commits:
289 impacting commits

186 Features Released with v3.15.0b4

[3.15] gh-152132: Fix Py_RunMain() to return an exit code (GH-153446)
#153454
[3.15] gh-152132: Test all PyRun functions in test_capi.test_run (GH-153352)
#153411
[3.15] gh-152132: Test Py_CompileString() in test_capi.test_run (GH-153470)
#153472
[3.15] gh-151029: Fix sys.remote_exec() unable to find writable memory when libpython replaced on disk (GH-151032)
#152443
[3.15] gh-151722: Defer GC tracking in frozendict.copy() (GH-152230)
#152271
[3.15] gh-151722: Do not track the frozendict in the GC in _PyDict_FromKeys() (GH-152067)
#152225
gh-152785: Upgrade Ubuntu from 24.04 to 26.04 in GitHub Actions
#152717
[3.15] gh-152680: Detect container/VM in test.pythoninfo (GH-152668)
#152699
[3.15] gh-151378: Fix unbounded memory growth when recording binary and the thread is sleeping (GH-152089)
#153047
[3.15] gh-151416: fix a borrowed ref potential use after free via fspath in os.spawnv/spawnve (GH-151417)
#152535
gh-151929: Get machine ID and uptime on Windows in pythoninfo
#152146
gh-143750: Compile OpenSSL with TSan for TSan CI
#153316
[3.15] gh-150743: Limit trailer lines and interim responses read by http.client (GH-150741)
#152523
[3.15] gh-153300: Set global configuration variables in PyConfig_Set() (GH-153301)
#153356
[3.15] gh-119592: gh-152967: Fix ProcessPoolExecutor stranding submitted work when a max_tasks_per_child worker exits (GH-152978)
#153363
[3.15] gh-145306: Fix browser open after empty export (GH-150017)
#152447
[3.15] gh-151929: Get boot ID, machine ID and uptime in test.pythoninfo (GH-152127)
#152134
[3.15] gh-151929: Get uptime on BSD/macOS in pythoninfo (GH-152189)
#152196
[3.15] gh-151929: Add pythoninfo commands to Platforms/WASI (GH-152136)
#152222
[3.15] gh-153056: Fix a data race compiling the string.Template pattern in free-threading builds (GH-153057)
#153302
[3.15] gh-152680: Detect virtualization on Windows in pythoninfo (GH-152824)
#152890
[3.15] gh-152434: Fix async-aware Gecko collection (GH-152442)
#152450
[3.14] gh-143990: Preserve the size when creating a Font from a named font (GH-153267) (GH-153323)
#153341
[3.15] gh-140729: Fix the cProfile module when the executed script contains calls to multiprocessing.Process (GH-144715)
#153243
[3.15] Don't require the `_test{internal}capi` modules in `test_monitoring.py` (GH-152311)
#152660
[3.15] Add "new in 3.15" comments to idlelib (GH-153052)
#153054
[3.15] gh-152305: Fix `_pydatetime.time.strftime()` raising on year directives (GH-152306)
#152425
[3.15] gh-151292: Change `total_samples:u32` in the binary format to `total_samples:u64` (GH-153425)
#153436
[3.15] gh-152718: Reject oversized table counts in the profiling binary reader (GH-152719)
#153050
[3.15] gh-151987: Pass filter_function to TarFile._extract_one() during .extract() (GH-151988)
#152608

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Top Contributors in v3.15.0b4

miss-islington
serhiy-storchaka
vstinner
StanFromIreland
terryjreedy
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corona10
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