hello-f2py example

projects/hello-f2py/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.5...3.22)
+
+project(hello LANGUAGES C Fortran)
+
+find_package(PythonExtensions REQUIRED)
+find_package(NumPy REQUIRED)
+find_package(F2PY REQUIRED)
+
+# see https://github.com/scikit-build/scikit-build/pull/495/
+set_target_properties(_f2py_runtime_library PROPERTIES POSITION_INDEPENDENT_CODE ON)
+
+add_subdirectory(hello_f2py)

projects/hello-f2py/hello_f2py/CMakeLists.txt

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+add_f2py_target(_hello _hello.pyf)
+add_library(_hello MODULE ${_hello} hello.f90)
+target_link_libraries(_hello ${F2PY_LIBRARIES})
+target_include_directories(_hello PRIVATE ${F2PY_INCLUDE_DIRS})
+python_extension_module(_hello)
+
+install(TARGETS _hello LIBRARY DESTINATION hello_f2py)

projects/hello-f2py/hello_f2py/__init__.py

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+from ._hello import hello
+
+__all__ = ("hello",)

projects/hello-f2py/hello_f2py/_hello.pyf

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+!    -*- f90 -*-
+! Note: the context of this file is case sensitive.
+
+python module _hello ! in
+    interface  ! in :_hello
+        subroutine hello(a) ! in :_hello:hello.f90
+            character*(*) intent(in) :: a
+        end subroutine hello
+    end interface
+end python module _hello
+
+! This file was auto-generated with f2py (version:1.24.2).
+! See:
+! https://web.archive.org/web/20140822061353/http://cens.ioc.ee/projects/f2py2e

projects/hello-f2py/hello_f2py/hello.f90

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+! generate a signature file from this file with:
+! $ python -m numpy.f2py hello.f90 -m _hello -h _hello.pyf
+! and edit if helpful (see F2PY docs)
+subroutine hello(a)
+    use, intrinsic :: iso_fortran_env
+    character(len=*) :: a
+    print '(A)', 'Hello, ' // a // '!'
+    flush(OUTPUT_UNIT)
+end subroutine hello

projects/hello-f2py/pyproject.toml

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+[project]
+name = "hello-f2py"
+version = "1.2.3"
+description = "a minimal example package (cython version)"
+authors = [
+    {name = "The scikit-build team"},
+]
+license = {text = "MIT"}
+requires-python = ">=3.7"
+dependencies = [
+    "numpy",
+]
+
+[build-system]
+requires = [
+    "setuptools",
+    "scikit-build",
+    "cmake",
+    "ninja",
+    "cython",
+    "numpy",
+]
+build-backend = "setuptools.build_meta"

projects/hello-f2py/setup.py

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+from skbuild import setup
+
+setup(packages=["hello_f2py"])

projects/hello-f2py/tests/test_hello_f2py.py

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+from hello_f2py import hello
+
+
+def test_hello(capfd):
+    hello("World")
+    captured = capfd.readouterr()
+    assert captured.out == "Hello, World!\n"