how to write a batch file in windows code example

Example 1: what is a windows batch file

@ECHO OFF
ECHO Congratulations! Your first batch file executed successfully.
PAUSE

Example 2: how to run bat file without effect main code

import subprocess
from subprocess import Popen
import time
from multiprocessing import Process,freeze_support

def run_batfile(name='world'):
	subprocess.call(["launch_pg.bat"])

if __name__ == '__main__':
	# freeze_support()
	p = Process(target=run_batfile)
	p.start()
	# p.join()	
	count = 0
	while True:
		count+=1
		print(count)
		time.sleep(1)