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cpython/Objects
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Cody Maloney 732224e113
gh-139871: Add bytearray.take_bytes([n]) to efficiently extract bytes (GH-140128) 
Update `bytearray` to contain a `bytes` and provide a zero-copy path to
"extract" the `bytes`. This allows making several code paths more efficient.

This does not move any codepaths to make use of this new API. The documentation
changes include common code patterns which can be made more efficient with
this API.

---

When just changing `bytearray` to contain `bytes` I ran pyperformance on a
`--with-lto --enable-optimizations --with-static-libpython` build and don't see
any major speedups or slowdowns with this; all seems to be in the noise of
my machine (Generally changes under 5% or benchmarks that don't touch
bytes/bytearray).


Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Maurycy Pawłowski-Wieroński <5383+maurycy@users.noreply.github.com>
2025-11-13 13:19:44 +00:00
..
clinic gh-139871: Add bytearray.take_bytes([n]) to efficiently extract bytes (GH-140128) 2025-11-13 13:19:44 +00:00
mimalloc gh-123826: Fix unused function warnings in mimalloc on NetBSD (#123827) 2024-09-09 13:22:28 -04:00
stringlib gh-139353: Rename formatter_unicode.c to unicode_formatter.c (#139723) 2025-10-08 14:56:00 +02:00
abstract.c gh-130821: Add type information to error messages for invalid return type (GH-130835) 2025-08-14 11:04:41 +03:00
boolobject.c gh-111178: remove redundant casts for functions with correct signatures (#131673) 2025-04-01 17:18:11 +02:00
bytearrayobject.c gh-139871: Add bytearray.take_bytes([n]) to efficiently extract bytes (GH-140128) 2025-11-13 13:19:44 +00:00
bytes_methods.c gh-129813, PEP 782: Use PyBytesWriter in _Py_bytes_maketrans() (#139044) 2025-09-17 17:43:30 +02:00
bytesobject.c gh-139871: Add bytearray.take_bytes([n]) to efficiently extract bytes (GH-140128) 2025-11-13 13:19:44 +00:00
call.c gh-111489: Remove _PyTuple_FromArray() alias (#139973) 2025-10-11 22:58:14 +02:00
capsule.c gh-111178: fix UBSan failures in Objects/capsule.c (GH-128239) 2025-01-08 14:55:04 +01:00
cellobject.c gh-127271: Replace use of PyCell_GET/SET (gh-127272) 2024-12-03 10:33:06 -08:00
classobject.c gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614) 2025-06-30 11:14:31 +00:00
codeobject.c gh-140815: Fix faulthandler for invalid/freed frame (#140921) 2025-11-04 11:48:28 +01:00
complexobject.c gh-141004: soft-deprecate Py_INFINITY macro (#141033) 2025-11-12 13:44:49 +01:00
descrobject.c gh-111489: Remove _PyTuple_FromArray() alias (#139973) 2025-10-11 22:58:14 +02:00
dictnotes.txt bpo-46845: Reduce dict size when all keys are Unicode (GH-31564) 2022-03-02 08:09:28 +09:00
dictobject.c gh-140551: Fix dict crash if clear is called at lookup stage (#140558) 2025-10-29 14:36:23 +05:30
enumobject.c gh-137609: Change names of some positional-only parameters in builtins (GH-137611) 2025-08-25 15:36:06 +03:00
exceptions.c gh-111489: Remove _PyTuple_FromArray() alias (#139973) 2025-10-11 22:58:14 +02:00
fileobject.c gh-130821: Add type information to error messages for invalid return type (GH-130835) 2025-08-14 11:04:41 +03:00
floatobject.c gh-141004: soft-deprecate Py_INFINITY macro (#141033) 2025-11-12 13:44:49 +01:00
frameobject.c GH-137623: Use an AC decorator for docstring line length enforcement (#137690) 2025-08-18 18:29:00 +01:00
funcobject.c gh-139924: Add PyFunction_PYFUNC_EVENT_MODIFY_QUALNAME event for function watchers (#139925) 2025-10-10 15:25:38 -07:00
genericaliasobject.c gh-138479: Ensure that __typing_subst__ returns a tuple (GH-138482) 2025-09-11 06:39:09 -04:00
genobject.c gh-140373: Correctly emit PY_UNWIND event when generator is closed (GH-140767) 2025-10-31 10:09:22 +00:00
interpolationobject.c gh-132661: Add default value (of "") for Interpolation.expression (#136441) 2025-07-10 16:27:41 +02:00
iterobject.c gh-130821: Add type information to error messages for invalid return type (GH-130835) 2025-08-14 11:04:41 +03:00
listobject.c gh-140009: Improve performance of list_extend_dictitems by using PyTuple_FromArray (#140010) 2025-10-13 15:58:25 +05:30
listsort.txt gh-135551: Change how sorting picks minimum run length (#135553) 2025-06-26 23:48:05 -05:00
lnotab_notes.txt gh-119786: add code object doc, inline locations.md into it (#126832) 2024-11-22 19:27:41 +00:00
longobject.c gh-111389: replace deprecated occurrences of _PyHASH_* macros (#141236) 2025-11-09 15:14:08 +01:00
memoryobject.c gh-129813, PEP 782: Use PyBytesWriter in memoryview (#138836) 2025-09-13 18:36:05 +02:00
methodobject.c gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614) 2025-06-30 11:14:31 +00:00
moduleobject.c gh-140550: Initial implementation of PEP 793 – PyModExport (GH-140556) 2025-11-05 12:31:42 +01:00
namespaceobject.c gh-136193: Improve TypeError msg when comparing two SimpleNamespaces (#136195) 2025-07-02 14:32:41 +03:00
object.c GH-138355: Remove trash_delete_later from _gc_runtime_state (#138767) 2025-09-17 21:25:24 +01:00
object_layout.md GH-115776: Allow any fixed sized object to have inline values (GH-123192) 2024-08-21 15:52:04 +01:00
object_layout_312.gv GH-115776: Embed the values array into the object, for "normal" Python objects. (GH-116115) 2024-04-02 11:59:21 +01:00
object_layout_312.png gh-71648: Optimize PNG files (GH-138842) 2025-09-12 20:13:05 +00:00
object_layout_313.gv GH-115776: Embed the values array into the object, for "normal" Python objects. (GH-116115) 2024-04-02 11:59:21 +01:00
object_layout_313.png gh-71648: Optimize PNG files (GH-138842) 2025-09-12 20:13:05 +00:00
object_layout_full_312.gv GH-96068: Document object layout (GH-96069) 2022-08-23 13:55:43 +01:00
object_layout_full_312.png gh-71648: Optimize PNG files (GH-138842) 2025-09-12 20:13:05 +00:00
object_layout_full_313.gv GH-115776: Embed the values array into the object, for "normal" Python objects. (GH-116115) 2024-04-02 11:59:21 +01:00
object_layout_full_313.png gh-71648: Optimize PNG files (GH-138842) 2025-09-12 20:13:05 +00:00
obmalloc.c GH-131033: Enable the optimizing macros UNLIKELY and LIKELY for Clang (GH-131019) 2025-08-25 21:59:52 +01:00
odictobject.c gh-125996: fix thread safety of collections.OrderedDict (#133734) 2025-10-13 22:55:07 +05:30
picklebufobject.c gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614) 2025-06-30 11:14:31 +00:00
rangeobject.c gh-126703: Add freelist for range and range_iter objects (GH-128619) 2025-04-07 04:40:52 +08:00
README
setobject.c gh-140476: optimize PySet_Add for frozenset in free-threading (#140440) 2025-11-12 01:57:21 +05:30
sliceobject.c gh-111178: Fix function signatures for multiple tests (#131496) 2025-03-20 12:27:03 +01:00
structseq.c gh-111489: Remove _PyTuple_FromArray() alias (#139973) 2025-10-11 22:58:14 +02:00
templateobject.c gh-132661: Disallow Template/str concatenation after PEP 750 spec update (#135996) 2025-07-21 08:44:26 +02:00
tupleobject.c GH-139951: Fix major GC performance regression (GH-140262) 2025-10-21 15:22:15 +01:00
typeobject.c gh-133467: Fix typeobject tp_base race in free threading (gh-140549) 2025-11-05 16:20:40 -05:00
typeslots.inc Revert "gh-133395: add option for extension modules to specialize BINARY_OP/SUBSCR, apply to arrays (#133396)" (#133498) 2025-05-06 13:12:26 +03:00
typeslots.py gh-124153: Implement PyType_GetBaseByToken() and Py_tp_token slot (GH-124163) 2024-09-18 09:18:19 +02:00
typevarobject.c gh-141376: Fix exported symbols (GH-141377) 2025-11-11 09:21:24 +01:00
unicode_format.c gh-139353: Add Objects/unicode_format.c file (#139491) 2025-10-10 12:52:59 +02:00
unicode_formatter.c gh-139353: Rename formatter_unicode.c to unicode_formatter.c (#139723) 2025-10-08 14:56:00 +02:00
unicode_writer.c gh-139353: Add Objects/unicode_writer.c file (#139911) 2025-10-30 14:36:15 +01:00
unicodectype.c gh-129117: Add unicodedata.isxidstart() function (#140269) 2025-10-30 10:18:12 +00:00
unicodeobject.c gh-55531: Implement normalize_encoding in C (#136643) 2025-10-30 15:31:47 +01:00
unicodetype_db.h closes gh-138706: update Unicode to 17.0.0 (#138719) 2025-09-11 09:58:39 -07:00
unionobject.c gh-140348: Fix using | on unusual objects plus Unions (#140383) 2025-11-03 06:50:37 -08:00
weakrefobject.c gh-133644: remove PyWeakref_GetObject and PyWeakref_GET_OBJECT (GH-133657) 2025-09-24 11:25:56 +02:00

README 

Source files for various builtin objects