C# Process.Start() not starting despite file existing and setting working directory

Question

Question update

I'm trying to use a C# script in Unity to call a python program. After following these two links:

How do I run a Python script from C#?

Process.Start() not starting the .exe file (works when run manually)

I could not get my C# script to call the python program. I know this isn't a problem with my python script because I can run the program in terminal without a problem.

public class JsonStream : MonoBehaviour
{
    private string GetStream()
    {
        ProcessStartInfo start = new ProcessStartInfo();

        //none of the paths work, the uncommented variables return true when using File.Exists
        //while the commented variables return false
        start.FileName = "/Library/Frameworks/Python.framework/Versions/3.6/bin/python3";
        //start.FileName = "\"/Library/Frameworks/Python.framework/Versions/3.6/bin/python3\"";

        start.Arguments = Directory.GetCurrentDirectory() + "/Assets/googlesheetspyprojectbatch/stream.py";
        //start.Arguments = "\"" + Directory.GetCurrentDirectory() + "/Assets/googlesheetspyprojectbatch/stream.py" + "\"";

        start.WorkingDirectory = Directory.GetCurrentDirectory() + "/Assets/googlesheetspyprojectbatch";
        //start.WorkingDirectory = "\"" + Directory.GetCurrentDirectory() + "/Assets/googlesheetspyprojectbatch" + "\"";

        start.UseShellExecute = false;
        start.RedirectStandardOutput = true;
        start.ErrorDialog = true;
        start.RedirectStandardError = true;

        using (Process process = Process.Start(start))
        {
            using (StreamReader reader = process.StandardOutput)
            {
                string result = reader.ReadToEnd();
                return result;
            }
        }
    }

    public void DoEverythingStream()
    {
        UnityEngine.Debug.Log("Doing Stream");
        string json_text = GetStream();
        string[] games = json_text.Trim().Split('\n');
        foreach (string game in games)
        {
            UnityEngine.Debug.Log(game);
        }
    }
}

Running the program raises no errors but also doesn't output anything. Does anyone have any ideas what may be wrong with my program? Thanks!

Answer 1

Old question, but I was struggling to figure out why C# (Unity) wasn't running my Python file even though a manual command prompt could.

By putting my python script's path in triple double quotes ("""), C# was able to run the script.

Example:

string fileName = @"""PATH\TO\YOUR\SCRIPT.PY""";
string pythonPath = @"PATH\TO\PYTHON.EXE";
System.Diagnostics.Process p = new System.Diagnostics.Process();
p.StartInfo = new System.Diagnostics.ProcessStartInfo(pythonPath, fileName)
        {
            RedirectStandardOutput = true,
            UseShellExecute = false,
            CreateNoWindow = true
        };
p.Start();