mpi4py 4.0.1

on Python PyPI

Update support for Python 3.13:

• Enable Cython 3.1 support for free-threaded CPython.
• Allow compiling Cython-generated C sources with the full Python C-API.
• Fix MPI DLL path workarounds on Windows after changes to locals().

Enhancements to test suite:

• Support XML reports via unittest-xml-reporting.
• Add command line options to exclude tests by patterns and files.
• Refactor Python 2 code to use Python 3 constructs using pyupgrade.

Miscellaneous:

• Minor and mostly inconsequential subclass fix in mpi4py.util.pkl5.
• Update compatibility workarounds for legacy MPICH 3.0 release.