This value indicating support the IEC 60559 floating-point standard (the
Annex F of C99). If enabled, the float type characteristics matches the
IEC 60559 double format and exceptional cases for the math's functions
follow to the section F.10 of the C99 standard.
Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Add base32 encoder and decoder functions implemented in
C to the binascii module and use them to greatly improve the
performance and reduce the memory usage of the existing
base32 codec functions in the base64 module.
* Add the alphabet parameter in functions b2a_base64(), a2b_base64(),
b2a_base85(), and a2b_base85().
* And a number of "*_ALPHABET" constants.
* Remove b2a_z85() and a2b_z85().
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Petr Viktorin <encukou@gmail.com>
* Struct.__new__() will require a mandatory argument (format)
* Calls of __init__() method with a different format argument on initialized
Struct are deprecated
Co-authored-by: Sergey B Kirpichev <skirpichev@gmail.com>
Add PyArg_ParseArray() and PyArg_ParseArrayAndKeywords()
functions to parse arguments of functions using the METH_FASTCALL
calling convention.
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
Mention updated stdlib modules and built-in functions.
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
Expose the %d substitution as the tkinter.Event attributes:
* "detail" for Enter, Leave, FocusIn, FocusOut, and ConfigureRequest events
* "user_data" for virtual events
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Deprecate PEP-456 [1] support for providing an external definition
of the string hashing scheme. Removal is scheduled for Python 3.19.
Previously, embedders could define the ``Py_HASH_ALGORITHM`` macro to be
``Py_HASH_EXTERNAL`` [2] to indicate that the hashing scheme was provided
externally but this feature was undocumented, untested and most likely
unused.
[1]: https://peps.python.org/pep-0456/
[2]: https://peps.python.org/pep-0456/#hash-function-selection
Add TYPE_FROZENDICT to the marshal module.
Add C API functions:
* PyAnyDict_Check()
* PyAnyDict_CheckExact()
* PyFrozenDict_Check()
* PyFrozenDict_CheckExact()
* PyFrozenDict_New()
Add PyFrozenDict_Type C type.
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Co-authored-by: Adam Johnson <me@adamj.eu>
Co-authored-by: Benedikt Johannes <benedikt.johannes.hofer@gmail.com>
Adds `prefixmatch` APIs to the re module as an alternate name for our long existing `match` APIs to help alleviate a common Python confusion for those coming from other languages regular expression libraries.
These alleviate common confusion around what "match" means as Python is different than other popular languages regex libraries in our use of the term as an API name. The original `match` names are **NOT being deprecated**. Source tooling like linters, IDEs, and LLMs could suggest using `prefixmatch` instead of match to improve code health and reduce cognitive burden of understanding the intent of code when configured for a modern minimum Python version.
See the documentation changes for a better description.
Discussions took place in the PR, in the issue, and finally at https://discuss.python.org/t/add-re-prefixmatch-deprecate-re-match/105927
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add Ascii85, Base85, and Z85 encoders and decoders to binascii,
replacing the existing pure Python implementations in base64.
This makes the codecs two orders of magnitude faster and consume
two orders of magnitude less memory.
Note that attempting to decode Ascii85 or Base85 data of length 1 mod 5
(after accounting for Ascii85 quirks) now produces an error, as no
encoder would emit such data. This should be the only significant
externally visible difference compared to the old implementation.
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
__enter__(), __exit__(), __aenter__(), and __aexit__() can now be
arbitrary descriptors, not only normal methods, for consistency with the
"with" and "async with" statements.
The pymalloc huge page support had two problems. First, on
architectures where the default huge page size exceeds the arena
size (e.g. 32 MiB on PPC, 512 MiB on ARM64 with 64 KB base
pages), mmap with MAP_HUGETLB silently allocates a full huge page
even when the requested size is smaller. The subsequent munmap
with the original arena size then fails with EINVAL, permanently
leaking the entire huge page. Second, huge pages were always
attempted when compiled in, with no way to disable them at
runtime. On Linux, if the huge page pool is exhausted, page
faults including copy-on-write faults after fork deliver SIGBUS
and kill the process.
The arena allocator now queries the system huge page size from
/proc/meminfo and skips MAP_HUGETLB when the arena size is not a
multiple of it. Huge pages also now require explicit opt-in at
runtime via the PYTHON_PYMALLOC_HUGEPAGES environment variable,
which is read through PyConfig and respects -E and -I flags.
The config field pymalloc_hugepages is propagated to the runtime
allocators struct so the low-level arena allocator can check it
without calling getenv directly.
