starting Comands from Python

[Werner Hartnagel]

Hi

Im a Python newbie and starting a small Project to learn Python better.
Its a GUI for the Image Magick Convert Tool.
The Application has a GtkCList with the Files to Convert.

My Problem is I dont understand how to start a Application (convert) as
a new Process. I use "posix.system(cmd_str)" to Test the Program, and of
course the GUI freeze :-(
It should wait for finish converting the File and start start again if
not "Cancel" is selected.

You make me very happy with some Source, urls, any hints.

regards

werner hartnagel