Interacting with UE4 Editor by commandline - best practice

Development Pipeline & Plugins Editor Scripting
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To answer your first question:
UE4Editor.exe is the editor itself. UE4Editor-Cmd.exe is the command-line for the editor. I’m actually really surprised to hear that UE4Editor-Cmd.exe is opening up the GUI for you. I’ve had it open “live coding” before, but that’s about it.

  1. I’m not sure about how to do this in Python, but here’s a way of doing it in C#, maybe you can figure it out how to convert that to Python.
Process myProcess = new Process();
Process myProcess = new Process();
myProcess .StartInfo.FileName = UE4EditorCmd; //Relative path to UE4Editor.exe
myProcess .StartInfo.Arguments =  "myProject.uproject -run=pythonscript"
myProcess .ErrorDataReceived += MyErrorFunc;
myProcess .OutputDataReceived += MyOutputFunc;

myProcess .Start();

myProcess.BeginErrorReadLine();
myProcess.BeginOutputReadLine();
try
{
	if (myProcess.WaitForExit(maxTime))
	{
      //test for different results. A result of 1, 2 or 3 doesn't mean it failed.
     //A result with a negative number means it crashed.

}



        internal static void MyErrorFunc(object _sender, DataReceivedEventArgs _event)
        {
            Console.WriteLine(_event.Data);
        }


//Same idea for MyOutputFunc