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Cpython v3.15.0a1

Cpython: v3.15.0a1 Release

Release date:
October 14, 2025
Previous version:
v3.14.0 (released October 7, 2025)
Magnitude:
71,931 Diff Delta
Contributors:
208 total committers
Data confidence:
Commits:
984 impacting commits

399 Features Released with v3.15.0a1

gh-138171: Migrate iOS testbed location and add Apple build script
#138176
gh-135953: Add Gecko reporter to sampling profiler
#139364
gh-138252: Add support in SSL module for getting and setting TLS signature algorithms
#138269
gh-132551: make BytesIO object free-thread safe
#132616
gh-90949: add Expat API to prevent XML deadly allocations
#139234
gh-137242: Allow Android testbed to take all Python command-line options
#138805
gh-90949: expose Expat API to tune exponential expansion protections
#139368
gh-116946: Revert GC protocol for immutable empty heap types (GH-138266, GH-138288, GH-138289)
#138338
gh-99631: Add custom loads and dumps support for the shelve module
#118065
gh-123471: Make concurrent iteration over itertools.cycle safe under free-threading
#131212
gh-116946: fully implement GC protocol for `_tkinter.Tk{app,tt}Object`
#138331
gh-139748: fix leaks in AC error paths when using FS-based converters
#139765
gh-96491: Deduplicate version in IDLE shell title
#139841
gh-76007: Deprecate `__version__` attribute
#138675
gh-132042: Remove resolve_slotdups to speedup class creation
#132156
gh-119109: improve `functools.partial` vectorcall with keywords
#124584
gh-139283: correctly handle `size` limit in `cursor.fetchmany()`
#139296
gh-138013: Remove `test_io` load_tests namespace manipulation
#138366
gh-90949: amend GH-139234 in prevision of future mitigation API
#139366
gh-91153: Fix bytearray holding a reference to its internal buffer when calling into potentially mutating __index__ methods
#132379
gh-116946: fully implement GC protocol for `zlib` objects
#138290
gh-138514: getpass: restrict `echo_char` to a single ASCII character
#138591
gh-138286: Run `ruff` on `Tools/i18n`
#138287
gh-126883: Add check that timezone fields are in range for `datetime.fromisoformat`
#127242
gh-138497: Support LLVM_VERSION configuration via env
#138498
gh-86819: Add ISO-TP CAN socket constants
#23794
gh-116946: Remove gc-support from some immutable types
#139073
gh-139327: fix some reference leaks in `sqlite3` error branches
#139328
gh-99948: Support ctypes.util.find_library in emscripten environment
#138519
gh-127971: fix off-by-one read beyond the end of a string during search
#132574

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Top Contributors in v3.15.0a1

picnixz
ericsnowcurrently
serhiy-storchaka
ZeroIntensity
markshannon
AA-Turner
nascheme
pablogsal
tomasr8
brandtbucher

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