best way of testing a program exists before using it?

[Nick Craig-Wood]

Tim Golden <tim.golden at viacom-outdoor.co.uk> wrote:
>          if os.path.isfile (filepath):
>            print filepath

You might get a more accurate result using

  os.access(filepath, os.X_OK)

instead of

  os.path.isfile(filepath)

Which checks the file is executable

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick