import subprocess
import time

def CrearProceso():
  try:
    SW_SHOWMAXIMIZED = 3
    info = subprocess.STARTUPINFO()
    info.dwFlags |= subprocess.STARTF_USESHOWWINDOW 
    info.wShowWindow = SW_SHOWMAXIMIZED
    proc = subprocess.Popen('notepad.exe', startupinfo=info)
    return proc
  except subprocess.CalledProcessError as e:
    print(e.output)
p = CrearProceso()
print ("El PID de este proceso es: " + str(p.pid))
time.sleep(5)