wsadmin - passing arguments when usng execfile()

I understand the correct way to execute a script with arguments from within wsadmin is to use the subprocess as follows

wsadmin>import subprocess
wsadmin>subprocess.call([sys.executable, 'abc.py', 'argument1', 'argument2'])

However, I can't seem to successfully import the subprocess module

This being the case I'm using the following approach...

wsadmin>import sys
wsadmin>sys.argv = ['argument1', 'argument2']
wsadmin>execfile('abc.py')