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Cpython v3.15.0a8

Cpython: v3.15.0a8 Release

Release date:
July 25, 2026
Previous version:
v3.15.0a7 (released March 10, 2026)
Magnitude:
19,189 Diff Delta
Contributors:
75 total committers
Data confidence:
Commits:
259 impacting commits

267 Features Released with v3.15.0a8

gh-145866: Convert `_CALL_INTRINSIC_2` to leave its inputs on the stack to be cleaned up by `_POP_TOP`
#146262
gh-131798: JIT: split call method and call builtin opcodes into smaller uops
#146463
gh-146558: optimize dict access with objects with known hash
#146559
gh-146058: Fix _GUARD_CODE_VERSION_*
#146060
gh-145866: Convert `DICT_MERGE` to leave its inputs on the stack to be cleaned up by `_POP_TOP`
#146329
gh-131798: JIT inline function addresses of builtin methods
#146906
gh-138122: Add differential flame graph
#145785
gh-145980: Add support for alternative alphabets in the binascii module
#145981
[3.14] gh-144545: Improve handling of default values in Argument Clinic (GH-146016)
#146052
GH-145247: Use _PyTuple_FromPair[Steal] in Objects
#145884
GH-146527: Add more data to GC statistics and add it to PyDebugOffsets
#146532
GH-145247: Use _PyTuple_FromPair in Modules(1)
#148000
gh-130472: Integrate fancycompleter with the new repl, to get colored tab completions
#130473
GH-145247: Use _PyTuple_FromPair in Modules(2)
#148003
gh-146151: support for complex arrays in the array module
#146237
gh-145219: Cache Emscripten libffi and mpdec builds, add install-emscripten cmd
#145664
Improve tests for the PyUnicodeWriter C API
#146157
gh-140870: PyREPL auto-complete module attributes in import statements
#140871
GH-126910: Make `_Py_get_machine_stack_pointer` return the stack pointer
#147945
gh-146450: Normalise feature set of Android build script with other platform build scripts
#146451
[3.13] gh-145144: Add more tests for UserList, UserDict, etc (GH-145145)
#146296
gh-146073: Revert "gh-146073: Add fitness/exit quality mechanism for JIT trace f…
#148082
gh-143050: correct PyLong_FromString() to use _PyLong_Negate()
#145901
gh-146416: Emscripten: Improve standard stream handling in node_entry.mjs
#146417
gh-146228: Better fork support in cached FastPath
#146231
gh-138577: Fix keyboard shortcuts in getpass with echo_char
#141597
gh-146444: Remove legacy iOS folder
#147993
gh-143387: Raise an exception instead of returning None when metadata file is missing.
#146234
gh-146207: Add support for OpenSSL 4.0.0 alpha1
#146217
gh-128341: Simplify the definition of _Py_INTERNAL_ABI_SLOT and use it in stdlib modules
#145770

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Top Contributors in v3.15.0a8

kumaraditya303
serhiy-storchaka
sergey-miryanov
vstinner
hoodmane
StanFromIreland
kangtastic
ivonastojanovic
skirpichev
antocuni

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