How do I pass arguments to a Python script with IronPython

Question

I have the following C# code where I call a python script from C#:

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Windows.Forms;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using IronPython.Hosting;
using Microsoft.Scripting.Hosting;
using IronPython.Runtime;

namespace RunPython
{
    class Program
    {
        static void Main(string[] args)
        {
            ScriptRuntimeSetup setup = Python.CreateRuntimeSetup(null);
            ScriptRuntime runtime = new ScriptRuntime(setup);
            ScriptEngine engine = Python.GetEngine(runtime);
            ScriptSource source = engine.CreateScriptSourceFromFile("HelloWorld.py");
            ScriptScope scope = engine.CreateScope();
            source.Execute(scope);
        }
    }
}

I'm having trouble understanding each line of the code because my experience with C# is limited. How would I alter this code in order to pass a command line argument to my python script when I run it?

Answer 1

Thank you all for pointing me in the correct direction. For some reason engine.sys seems to no longer work for more recent versions of IronPython so instead GetSysModule must be used. Here is the revised version of my code that allows me to alter argv:

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Windows.Forms;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using IronPython.Hosting;
using Microsoft.Scripting;
using Microsoft.Scripting.Hosting;
using IronPython.Runtime;

namespace RunPython
{
    class Program
    {
        static void Main(string[] args)
        {
            ScriptRuntimeSetup setup = Python.CreateRuntimeSetup(null);
            ScriptRuntime runtime = new ScriptRuntime(setup);
            ScriptEngine engine = Python.GetEngine(runtime);
            ScriptSource source = engine.CreateScriptSourceFromFile("HelloWorld.py");
            ScriptScope scope = engine.CreateScope();
            List<String> argv = new List<String>();
            //Do some stuff and fill argv
            argv.Add("foo");
            argv.Add("bar");
            engine.GetSysModule().SetVariable("argv", argv);
            source.Execute(scope);
        }
    }
}