Run a python script with arguments

Question

I want to call a Python script from C, passing some arguments that are needed in the script.

The script I want to use is mrsync, or multicast remote sync. I got this

Answer 1

Seems like you're looking for an answer using the python development APIs from Python.h. Here's an example for you that should work:

#My python script called mypy.py
import sys

if len(sys.argv) != 2:
  sys.exit("Not enough args")
ca_one = str(sys.argv[1])
ca_two = str(sys.argv[2])

print "My command line args are " + ca_one + " and " + ca_two

And then the C code to pass these args:

//My code file
#include 
#include 

void main()
{
    FILE* file;
    int argc;
    char * argv[3];

    argc = 3;
    argv[0] = "mypy.py";
    argv[1] = "-m";
    argv[2] = "/tmp/targets.list";

    Py_SetProgramName(argv[0]);
    Py_Initialize();
    PySys_SetArgv(argc, argv);
    file = fopen("mypy.py","r");
    PyRun_SimpleFile(file, "mypy.py");
    Py_Finalize();

    return;
}

If you can pass the arguments into your C function this task becomes even easier:

void main(int argc, char *argv[])
{
    FILE* file;

    Py_SetProgramName(argv[0]);
    Py_Initialize();
    PySys_SetArgv(argc, argv);
    file = fopen("mypy.py","r");
    PyRun_SimpleFile(file, "mypy.py");
    Py_Finalize();

    return;
}

You can just pass those straight through. Now my solutions only used 2 command line args for the sake of time, but you can use the same concept for all 6 that you need to pass... and of course there's cleaner ways to capture the args on the python side too, but that's just the basic idea.

Hope it helps!