Environment variable tests using python c-api.

env.cpp

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

// compile with:
// g++ -o env env.cpp -O2 -Wall -Wno-long-long -pedantic -pthread $(pkg-config --cflags --libs python2)

void show_paths() {
    std::string env_path;

    env_path = std::getenv("PATH");
    if (env_path.c_str())
        std::cout << "PATH: " << env_path << std::endl;
    else
        std::cout << "PATH: NULL" << std::endl;

    const char *search_path = Py_GetPath();

    if (search_path != NULL) {
        // if there is a path to use append it to our custom search path as a fallback
        std::cout << "Py_GetPath: " << search_path << std::endl;
    } else {
        std::cout << "Py_GetPath: NULL" << std::endl;
    }
}

int main()
{
    std::cout << "Environment variables test" << std::endl << std::endl;
    show_paths();
}

The important parts:

# env
Py_GetPath: /usr/lib/python2.7/:/usr/lib/python2.7/plat-x86_64-linux-gnu:/usr/lib/python2.7/lib-tk:/usr/lib/python2.7/lib-old:/usr/lib/python2.7/lib-dynload

# launcher
Py_GetPath: /usr/lib/python2.7/:/usr/lib/python2.7/plat-linux2:/usr/lib/python2.7/lib-tk:/usr/lib/python2.7/lib-old:/usr/lib/python2.7/lib-dynload