I am working on a Python script that is going to be run in the command line. The idea is to get a command from the user, run it and then provide the wall-clock time and the CPU time of the command provided by the user. See code below.

```
#!/usr/bin/env python 
import os
import sys

def execut_cmd(cmd_line):
    utime = os.system('time '+cmd_line)
    # Here I would like to store the wall-clock time in the Python variable 
    # utime.
    cputime = os.system('time '+cmd_line)
    # Here the CPU time in the cputime variable. utime and cputime are going to 
    # be used later in my Python script. In addition, I would like to silence the 
    # output of time in the screen.

execut_cmd(sys.argv[1]) 
print ('Your command wall-clock time is '+utime)
print ('Your command cpu time is '+ cputime)

```

How can I accomplish this? Also, if there is a better method than using 'time' I am open to try it.