title: Python: os.system() without return or error
body: <p>I need to use os.system() a few times in my script, but I don't want errors from the shell to appear in my script's window.  Is there a way to do this?  I guess it's sort of like silent commands, running to their full extent, but not returning <em>any</em> text.  I can't use 'try', because it's not a Python error.</p>