f2py on Windows including AppVeyor CI
Importing Fortran libraries from Python
is easy and highly effective.
We write modern Fortran code from scratch explicitly for the purpose of importing into Python.
Here is an example
.appveyor.yml script useful for CI with f2py.
image:
- Visual Studio 2019
- ubuntu
stack: python 3
environment:
PY_DIR: C:/Python38-x64
MINGW_DIR: C:/msys64/mingw64/bin
clone_depth: 25
build: off
init:
- cmd: set PATH=%PY_DIR%;%PY_DIR%\Scripts;%PATH%
- cmd: set PATH=%MINGW_DIR%;%PATH%
- ps: if ($isWindows) {echo "[build]`ncompiler=mingw32" | Out-File -Encoding ASCII ~/pydistutils.cfg}
install: pip install -e .[tests]
test_script: pytest
This pyproject.toml ensures Numpy is installed before attempting to build the Fortran extension module:
[build-system]
requires = ["setuptools", "numpy"]
setup.py must import setuptools, even though it isn’t directly used here, to enable developer mode via pip install -e .
import setuptools # noqa: F401
from numpy.distutils.core import setup, Extension
setup(ext_modules=[Extension(name='mymod', sources=['mylib.f90'])])