Reading stdout and stderr of an external program

[Ben Cartwright]

> I need to be able to read the stdout and stderr streams of an external
> program that I launch from my python script. os.system( 'my_prog' +
> '>& err.log' ) and was planning on monitoring err.log and to display
> its contents. Is this the best way to do this?

from subprocess import Popen
stdout, stderr = Popen('my_prog').communicate()

--Ben