Launch another application

[KDawg44]

Hi,

I would like to launch another application and pass some arguments to
it from python.  WHen the user clicks on the button, i want it to
execute:

binaryApplication fileName

Is there a way to do this as if I was doing it from a shell in
python?  Would it be using something like popen?  this app does not
need to return anything to the python app i am writing and the python
app does not need to wait for it (to close or do anyting else).

Thanks.