Run a Python script from C#

Question

I'm trying to run a python script from a C# console app, the script is a simple CLI application. The problem is that when I run the console application, the output terminal does not show me any result returned from python script.

Python Script:

import argparse

parser = argparse.ArgumentParser()
parser.add_argument('FirstName')
parser.add_argument('LastName')

args = parser.parse_args()
first_name = args.FirstName
last_name = args.LastName

print(f"{first_name} {last_name}")

C# Code

namespace CS_PythonTest
{
    internal class Program
    {
        static void Main(string[] args)
        {
        var psi = new ProcessStartInfo();
        psi.FileName = @"\python.exe";
        var script = "\pythonScript.py";

        psi.Arguments = $"{script}";
    
        psi.UseShellExecute = false;
        psi.CreateNoWindow= true;
        psi.RedirectStandardOutput= true;
        psi.RedirectStandardError= true;

        var errors = "";
        var results = "";

        using (var process = Process.Start(psi)) {
            errors = process.StandardError.ReadToEnd();
            results= process.StandardOutput.ReadToEnd();
        }

        Console.WriteLine(results);


        }
    }
}

Does this answer your question? [How do I run a Python script from C#?](https://stackoverflow.com/questions/11779143/how-do-i-run-a-python-script-from-c) — ThisQRequiresASpecialist, Jan 25 '23 at 08:16
The code you've provided doesn't compile, due to `"\pythonScript.py"` - obviously that's easy to fix, but it does make me wonder what *other* aspects of the code you're running aren't actually as shown. (And are both `python.exe` and the python script itself in your root directory?) — Jon Skeet, Jan 25 '23 at 08:19
Does this even run? The path arguments are both wrong. Both have an invalid backslash at the start. — Panagiotis Kanavos, Jan 25 '23 at 08:20
The python script is in the root directory, but the 'python.exe' is not — , Jan 25 '23 at 08:26
@PanagiotisKanavos Most likely not but this is a duplicate and can easily be solved from the link I've provided above. It uses the exact same logic. There is a lot of nice detailed questions asked in there and good answers. — ThisQRequiresASpecialist, Jan 25 '23 at 08:26
Shouldn't you pass these two arguments FirstName LastName aswell to your script? LIke `psi.Arguments = $"{script} John Doe";`? — lidqy, Jan 25 '23 at 08:38
@CezarMarcu you aren't specifying the root directory, you're using an invalid escape sequence. A drive's root isn't `\\` anyway. — Panagiotis Kanavos, Jan 25 '23 at 08:45

Run a Python script from C#

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