v1.26.0b1

NumPy 1.26.0 Release Notes

The NumPy 1.26.0 release is a continuation of the 1.25.x release cycle
with the addition of Python 3.12.0 support. Python 3.12 dropped
distutils, consequently supporting it required finding a replacement for
the setup.py/distutils based build system NumPy was using. We have
chosen to use the Meson build system instead, and this is the first
NumPy release supporting it. This is also the first release that
supports Cython 3.0 in addition to retaining 0.29.X compatibility.
Supporting those two upgrades was a large project, over 100 files have
been touched in this release. The changelog doesn't capture the full
extent of the work, special thanks to Ralf Gommers, Sayed Adel, Stéfan
van der Walt, and Matti Picus who did much of the work in the main
development branch.

The highlights of this release are:

• Python 3.12.0 support.
• Cython 3.0.0 compatibility.
• Use of the Meson build system
• Updated SIMD support

The Python versions supported in this release are 3.9-3.12.

Build system changes

In this release, NumPy has switched to Meson as the build system and
meson-python as the build backend. Installing NumPy or building a wheel
can be done with standard tools like pip and pypa/build. The
following are supported:

• Regular installs: pip install numpy or (in a cloned repo)
  pip install .
• Building a wheel: python -m build (preferred), or pip wheel .
• Editable installs: pip install -e . --no-build-isolation
• Development builds through the custom CLI implemented with
  spin: spin build.

All the regular pip and pypa/build flags (e.g.,
--no-build-isolation) should work as expected.

NumPy-specific build customization

Many of the NumPy-specific ways of customizing builds have changed. The
NPY_* environment variables which control BLAS/LAPACK, SIMD,
threading, and other such options are no longer supported, nor is a
site.cfg file to select BLAS and LAPACK. Instead, there are
command-line flags that can be passed to the build via pip/build's
config-settings interface. These flags are all listed in the
meson_options.txt file in the root of the repo. Detailed documented
will be available before the final 1.26.0 release; for now please see
the SciPy "building from source"docs since most
build customization works in an almost identical way in SciPy as it does
in NumPy.

Build dependencies

While the runtime dependencies of NumPy have not changed, the build
dependencies have. Because we temporarily vendor Meson and meson-python,
there are several new dependencies - please see the [build-system]
section of pyproject.toml for details.

Troubleshooting

This build system change is quite large. In case of unexpected issues,
it is still possible to use a setup.py-based build as a temporary
workaround (on Python 3.9-3.11, not 3.12), by copying
pyproject.toml.setuppy to pyproject.toml. However, please open an
issue with details on the NumPy issue tracker. We aim to phase out
setup.py builds as soon as possible, and therefore would like to see
all potential blockers surfaced early on in the 1.26.0 release cycle.

Contributors

A total of 11 people contributed to this release. People with a "+" by
their names contributed a patch for the first time.

• Bas van Beek
• Charles Harris
• Matti Picus
• Melissa Weber Mendonça
• Ralf Gommers
• Sayed Adel
• Sebastian Berg
• Stefan van der Walt
• Tyler Reddy
• Warren Weckesser

Pull requests merged

A total of 18 pull requests were merged for this release.

• #24305: MAINT: Prepare 1.26.x branch for development
• #24308: MAINT: Massive update of files from main for numpy 1.26
• #24322: CI: fix wheel builds on the 1.26.x branch
• #24326: BLD: update openblas to newer version
• #24327: TYP: Trim down the _NestedSequence.__getitem__ signature
• #24328: BUG: fix choose refcount leak
• #24337: TST: fix running the test suite in builds without BLAS/LAPACK
• #24338: BUG: random: Fix generation of nan by dirichlet.
• #24340: MAINT: Dependabot updates from main
• #24342: MAINT: Add back NPY_RUN_MYPY_IN_TESTSUITE=1
• #24353: MAINT: Update extbuild.py from main.
• #24356: TST: fix distutils tests for deprecations in recent setuptools...
• #24375: MAINT: Update cibuildwheel to version 2.15.0
• #24381: MAINT: Fix codespaces setup.sh script
• #24403: ENH: Vendor meson for multi-target build support
• #24404: BLD: vendor meson-python to make the Windows builds with SIMD...
• #24405: BLD, SIMD: The meson CPU dispatcher implementation
• #24406: MAINT: Remove versioneer

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