test (hello world) python-c-api

test-py.cpp

// -*- mode: cpp; coding: utf-8 -*-
//
// $ g++ -pedantic -std=c++11 -o test-py test-py.cpp $(pkg-config --cflags --libs python3)
//

#include <clocale>
#include <cstdlib>
#include <Python.h>

int main(int argc, char *argv[]) {
    setlocale(LC_ALL, "");
    
    size_t main_path_size = 100000;
    wchar_t *main_path = 0;
    
    main_path = new wchar_t[main_path_size];
    mbstowcs(main_path, argv[0], main_path_size - 1);
    main_path[main_path_size - 1] = 0;
    
    Py_Initialize();
    PySys_SetArgv(1, &main_path);
    
    PyObject *vars = Py_BuildValue(
            "{s:s,s:s,s:s}",
            "var_a",
            "VAR_A_VAL",
            "var_b",
            "VAR_Bфиг няBB_VAL",
            "var_for_mod",
            "проверка модуля"
            );
    PyDict_SetItemString(vars, "__builtins__", PyEval_GetBuiltins());
    
    PyObject *result = 0;
    
    result = PyRun_String(
            "x = 123 + 4\n",
            Py_file_input,
            vars,
            0
            );
    if (!result) {
        wprintf(L"error 1!\n");
    }
    Py_CLEAR(result);
    
    result = PyRun_String(
            "print(x)\n"
            "print('var_a is {!r}; var_b is {!r}'.format(var_a, var_b))\n"
            "import sys\n"
            "print(sys.path)\n",
            Py_file_input,
            vars,
            0
            );
    if (!result) {
        wprintf(L"error 2!\n");
    }
    Py_CLEAR(result);
    
    result = PyRun_String(
            "import test_mod\n"
            "test_mod.test_func(var_for_mod)\n",
            Py_file_input,
            vars,
            0
            );
    if (!result) {
        wprintf(L"error 3!\n");
    }
    Py_CLEAR(result);
    
    Py_CLEAR(vars);
    
    Py_Finalize();
    if (main_path) {
        delete[] main_path;
        main_path = 0;
    }
    
    return 0;
}

test-py.pro

CONFIG += console
SOURCES += test-py.cpp
win32 {
    INCLUDEPATH += C:/devel/Python33/include
    LIBS += C:/devel/Python33/libs/python33.lib
}
unix {
    CONFIG += link_pkgconfig
    PKGCONFIG += python3
}

test_mod.py

# -*- mode: python; coding: utf-8 -*-

def test_func(v):
    print('*** good module! {!r} ***'.format(v))