lunchin bat file

import os
os.system(r"D:\Pyt\regresja\FileBackUp\FileGen\GenerateProject 0")   <--- 0 to argument


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import subprocess

filepath=r"D:\test\hello"
p = subprocess.Popen(filepath, shell=True, stdout = subprocess.PIPE)

stdout, stderr = p.communicate()
print (p.returncode) # is 0 if success


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from subprocess import Popen
p = Popen("batchfile.bat", cwd=r"D:\test\hello")
stdout, stderr = p.communicate()