executing non-Python conde

[Earl Eiland]

I need to repeatedly execute an .exe program, changing the command line
arguments, and log the output.

My search of Python documentation and O'Reilly texts hasn't uncovered
how I do this.  Both exec and execfile seem to only run Python code. 
Also, neither seem to be able to pass parameters. (Although there is a
reference to global and local dictionaries that I don't understand.)

Surely there is a way to do this!

Earl Eiland