Are you saying that I should try modifying
~/opt/anaconda3/lib/python3.11/site-packages/numpy/f2py/_backends/-init_.py, as
follows:
def f2py_build_generator(name):
if name == "meson":
from ._meson import MesonBackend
return MesonBackend
#elif name == "distutils":
# from ._distutils import DistutilsBackend
# return DistutilsBackend
else:
raise ValueError(f"Unknown backend: {name}")
appears to be where the "key" is chosen, furthermore,
Please advise.
Sam Dupree.
On Tue, 06 Jan 2026 09:14:47 -0800, Bill Ross <[email protected]> wrote:
> So, what do you think the best way is to fix my problem?
Per Charles Harris, stub out the missing OS, which distutils seems to try to
load by default (i.e. the key is 'distutils' not the unwanted OS so my idea
wasn't fruitful):
> Might try using the patch in https://github.com/numpy/numpy/pull/27406.
Bill Ross
--
Phobrain.com
On 2026-01-06 08:49, Samuel H Dupree Jr wrote:
The source member,
~/opt/anaconda3/lib/python3.11/site-packages/numpy/f2py/_backends/-init_.py,
def f2py_build_generator(name):
if name == "meson":
from ._meson import MesonBackend
return MesonBackend
elif name == "distutils":
from ._distutils import DistutilsBackend
return DistutilsBackend
else:
raise ValueError(f"Unknown backend: {name}")
appears to be where the "key" is chosen, furthermore, in f2p2e.py sets the
background_key and invokes 2py_build_generator. To my knowledge, I'm not
running meson. So, what do you think the best way is to fix my problem?
Please advise,
Sam Dupree
On Sun, 04 Jan 2026 18:23:22 -0800, Bill Ross <[email protected]> wrote:
Uninformed debugging:
> build_backend = f2py_build_generator(backend_key)
Can you inspect that backend_key? It seems like it could be 'key' to choosing
the wrong back end.
Bill
--
Phobrain.com
On 2026-01-04 17:18, Samuel H Dupree Jr wrote:
I am resurrecting a Python program I wrote a few years under Python 3.9. I'm
presently:
Running Python 3.11 under Mac OSX Sequoia (ver. 15.7.1)
Using NumPy version 1.26.4
Running on an Intel (x86-64) Mac Pro Desktop (2019)
The program uses a Fortran 77 subroutine that was wrapped using f2py when I
running Python 3.9. However, when I attempt to wrap that same subroutine (the
source code is attached to this note) using f2py in Python 3.11, I get the
following error message.
(base) user@Mac-Pro accgravityfiled_builder_f2py % f2py -c accgravityfield.f
-m accgravityfield
Traceback (most recent call last):
File "/Users/user/opt/anaconda3/bin/f2py", line 8, in <module>
sys.exit(main())
^^^^^^
File
"/Users/user/opt/anaconda3/lib/python3.11/site-packages/numpy/f2py/f2py2e.py",
line 766, in main
run_compile()
File
"/Users/user/opt/anaconda3/lib/python3.11/site-packages/numpy/f2py/f2py2e.py",
line 594, in run_compile
build_backend = f2py_build_generator(backend_key)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/user/opt/anaconda3/lib/python3.11/site-packages/numpy/f2py/_backends/__init__.py",
line 6, in f2py_build_generator
from ._distutils import DistutilsBackend
File
"/Users/user/opt/anaconda3/lib/python3.11/site-packages/numpy/f2py/_backends/_distutils.py",
line 3, in <module>
from numpy.distutils.core import setup, Extension
File
"/Users/user/opt/anaconda3/lib/python3.11/site-packages/numpy/distutils/core.py",
line 24, in <module>
from numpy.distutils.command import config, config_compiler, \
File
"/Users/user/opt/anaconda3/lib/python3.11/site-packages/numpy/distutils/command/config.py",
line 19, in <module>
from numpy.distutils.mingw32ccompiler import generate_manifest
File
"/Users/user/opt/anaconda3/lib/python3.11/site-packages/numpy/distutils/mingw32ccompiler.py",
line 27, in <module>
from distutils.msvccompiler import get_build_version as
get_build_msvc_version
ModuleNotFoundError: No module named 'distutils.msvccompiler'
(base) user@Mac-Pro accgravityfiled_builder_f2py %
As for gfortran is concerned:
(base) user@Mac-Pro accgravityfiled_builder_f2py % gfortran -v
Using built-in specs.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=/usr/local/Cellar/gcc/15.2.0/bin/../libexec/gcc/x86_64-apple-darwin24/15/lto-wrapper
Target: x86_64-apple-darwin24
Configured with: ../configure --prefix=/usr/local/opt/gcc
--libdir=/usr/local/opt/gcc/lib/gcc/current --disable-nls
--enable-checking=release --with-gcc-major-version-only
--enable-languages=c,c++,objc,obj-c++,fortran --program-suffix=-15
--with-gmp=/usr/local/opt/gmp --with-mpfr=/usr/local/opt/mpfr
--with-mpc=/usr/local/opt/libmpc --with-isl=/usr/local/opt/isl
--with-zstd=/usr/local/opt/zstd --with-pkgversion='Homebrew GCC 15.2.0'
--with-bugurl=https://github.com/Homebrew/homebrew-core/issues
--with-system-zlib --build=x86_64-apple-darwin24
--with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.2.0 (Homebrew GCC 15.2.0)
(base) user@Mac-Pro accgravityfiled_builder_f2py %
I have two questions:
Why is f2py in a Mac OSX Intel based environment attempting to import
'distutils.msvccompiler' that is required for Windows' environment only?
What do I need to do to eliminate this problem?
Any thoughts?
Sam Dupree
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