Executing a program

[Eirik]

Greetings!

How can I run a program from within Python?

I have tried the exec* family of functions, but I get these strange 
errors, like this:

  Exception in Tkinter callback
  Traceback (most recent call last):
    File "/usr/lib/python2.2/lib-tk/Tkinter.py", line 1300, in __call__
      return apply(self.func, args)
    File "./PPP", line 9, in run_app
      os.execvp("home/eirik/ppp-skript", argument)
    File "/usr/lib/python2.2/os.py", line 298, in execvp
      _execvpe(file, args)
    File "/usr/lib/python2.2/os.py", line 324, in _execvpe
      apply(func, (file,) + argrest)
  OSError: [Errno 2] No such file or directory