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Cpython v3.15.0b1

Cpython: v3.15.0b1 Release

Release date:
May 22, 2026
Previous version:
v3.15.0a8 (released May 13, 2026)
Magnitude:
60,848 Diff Delta
Contributors:
98 total committers
Data confidence:
Commits:
320 impacting commits

282 Features Released with v3.15.0b1

gh-148105: _pyrepl: switch console refresh to structured rendered screens
#146584
gh-131798: split `_CALL_BUILTIN_CLASS` to smaller uops
#148094
gh-148235: remove duplicate uops `_LOAD_CONST_UNDER_INLINE(_BORROW)` in JIT
#148236
gh-131798: fold super method lookups in JIT
#148231
gh-gh-131798: optimize LOAD_ATTR_GETATTRIBUTE_OVERRIDDEN in the JIT
#148555
gh-146393: Use recorded type instead of instance in BINARY_OP
#148569
gh-148675: Add Zd/Zf formats to array, ctypes, memoryview, struct
#148676
GH-126910: Add gdb support for unwinding JIT frames
#146071
GH-126910: Add GNU backtrace support for unwinding JIT frames
#149104
gh-149189: Modern defaults for `pprint`
#149190
gh-148641: Implement PEP 829 - startup configuration files
#149109
GH-146527: Add get_gc_stats function to _remote_debugging
#148071
gh-148766: Add colour to Python help
#148767
gh-149296: Add `dump` subcommand to sampling profiler for one-shot stack snapshots
#149297
gh-148211: decompose `_POP_TWO/_POP_CALL(_ONE/_TWO)` in JIT
#148377
gh-148178: Validate remote debug offset tables on load
#148187
gh-148171: convert more variadic uops to leave input on stack
#148361
gh-146256: Add `--jsonl` collector to the `profiling.sampling`
#146257
gh-121190: Emit a better error message from `importlib.resources.files()` when module spec is `None`"
#148460
gh-146261: JIT: protect against function version changes
#146300
gh-149017: Upgrade bundled Expat to 2.8.0
#149020
gh-130472: Use fancycompleter in import completions
#148188
gh-148352: Add more colour to `calendar` CLI output
#148354
GH-126910: Build/link the JIT shim in the Python interpreter
#148872
gh-149026: Add colour to `pickletools` CLI output
#149027
gh-148981: Add color to `ast.dump`
#148982
gh-127012: `Traversable.read_text` now allows/solicits an `errors` parameter.
#148401
gh-148014: Accept a function name in -X presite option
#148015
gh-98894: Restore function entry/exit DTrace probes
#142397
gh-149300: `_remote_debugging`: clean up magic and duplicate consts in the binary format helper
#149301

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Top Contributors in v3.15.0b1

NekoAsakura
markshannon
eendebakpt
pablogsal
kumaraditya303
encukou
jihugo
serhiy-storchaka
sergey-miryanov
diegorusso

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