Start and Iteract with Python Application in C#

Unity Engine
1

I’m trying to build a script that can start a python application, then read and write to the console for that application (I want to do this because there is a certain library in python that I need to use for Unity). I have a script in my main scene, attached to an empty GameObject:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

using System;
using System.Diagnostics;
using System.IO;
using System.Text;

public class PythonSetup : MonoBehaviour {
    public string pythonExe;              // Set this to your python.exe file

    // Use this for initialization
    void Start () {
        SetupPython ();
    }
   
    // Update is called once per frame
    void Update () {
       
    }

    void SetupPython() {
        string fileName = @"C:\sample_script.py";

        Process p = new Process();
        p.StartInfo = new ProcessStartInfo(pythonExe, fileName)
        {
            RedirectStandardOutput = true,
            UseShellExecute = false,
            CreateNoWindow = true
        };
        Console.InputEncoding = Encoding.UTF8;
        p.Start();

        UnityEngine.Debug.Log (p.StandardOutput.ReadToEnd ());
        p.StandardInput.WriteLine ("\n hi \n");
        UnityEngine.Debug.Log(p.StandardOutput.ReadToEnd());

        p.WaitForExit();
    }
}

In the C drive I have sample_script.py:

print("Input below:")
i = input()
print(i)

I am running Windows 10 with the latest Unity.
When I run my game, it is stuck (I think on the line p.WaitForExit()). Thanks for your help ahead of time!

2

I suggest using a coroutine to handle WaitForExit and other interaction with the process. That way your main loop won’t freeze up if something weird happens in the other process.