how to tell if a .exe file is running with pythom code example

Example 1: how to check if an application is open in python

#Iterates through all the programs running in your system and checks for the one in the string
import psutil    
"someProgram" in (p.name() for p in psutil.process_iter())

Example 2: python check if exe is running

import subprocess

s = subprocess.check_output('tasklist', shell=True)
if "cmd.exe" in s:
    print s