I would like to output some data in a separated console window on windows.

Therefore I start a new subprocess calling ‘cmd’ to open a new window and start writing via the stdin.write() method:

import subprocess
import time

cli_ampel_proc = subprocess.Popen(['cmd'], stdin=subprocess.PIPE, creationflags=subprocess.CREATE_NEW_CONSOLE, text=True)
cli_ampel_proc.stdin.write('@echo offn')
cli_ampel_proc.stdin.flush()

cli_ampel_proc.stdin.write('clsn')  # Clear the console
cli_ampel_proc.stdin.write('echo Startn')
cli_ampel_proc.stdin.flush()
time.sleep(3)

What I would like to have is a clean output just showing:

Start

However I get this:

echo Start
Start

How can I suppress the first line (echo Start)?