====== CからPythonのコードを実行する ======

作成日: 2023-08-05 (土)

[[https://youtu.be/w1hjt4I3rbQ|第4回 Python/C APIに触れてみる (3)]]

===== ソースコード =====

==== toymath.py ====

<file python>
def add(a, b):
    return a + b

def sub(a, b):
    return a - b
</file>

==== test_toymath.py ====

<file python>
import toymath

x = toymath.add(1, 2)
y = toymath.sub(1, 2)
x = x + y

print(x, y)
</file>

==== myapp.c ====

<file c>
#define PY_SSIZE_T_CLEAN
#include <Python.h>

int main() {
  Py_Initialize();

  PyRun_SimpleString("import os, sys \n"
                     "sys.path.append(os.getcwd()) \n");

  FILE *fp = fopen("test_toymath.py", "r");
  if (fp == NULL) {
    fprintf(stderr, "Error: cannot open file.\n");
    exit(1);
  }

  PyRun_SimpleFile(fp, "test_toymath.py");

  fclose(fp);
}
</file>

==== Makefile ====

<file makefile>
.PHONY: all
all: myapp

myapp: myapp.o
	gcc `python3-config --ldflags --embed` -o $@ $^

myapp.o: myapp.c	
	gcc -c `python3-config --cflags` -o $@ $<
</file>