[Python] Execute "sudo mavproxy.py" from Python script

I am trying to execute this command sudo mavproxy.py from a python script on raspberrypi. I can execute this in the shell and see it load.

The code I have for my current test is:

import subprocess
subprocess.call('sudo mavproxy.py')


Running this the code executes however looking at the terminal window nothing happens. I'm not sure whether it is executing correctly.

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