How to show progress of python script when using ProcessStartInfo in C#

Question

I am using ProcessStartInfo in C# to run my python script. But i want to know what percentage the python script has processed.

I am using below code. Python:

import time
if __name__ == '__main__':
    for i in range(100):
        #do something
        time.sleep(5)
        print(i+1,"%")

C#:

    private void run_cmd(string cmd, string args)
    {
        ProcessStartInfo start = new ProcessStartInfo();
        start.FileName = cmd;
        start.Arguments = args;
        start.UseShellExecute = false;
        start.RedirectStandardOutput = true;
        using (Process process = Process.Start(start))
        {
            using (StreamReader reader = process.StandardOutput)
            {
                string result = reader.ReadToEnd();
                Console.Write(result);
                // do something to show percentage
            }
        }
    }

But I received everything python printed at once like (1%, 2%,...100%).

How can I received the commandprompt output step by step.
P/s: I tried to edit RedirectStandardOutput = false to get it step by step but I have an error in C# code.