To run a python script in the Composite embedded Python interpreter, do the following:

1. Locate the script in a Composite "File Browser" ("Ctrl-I" (Windows and Linux) or “Cmd+ I” (Mac OS) to bring up a floating browser for example). Note that in order for Composite to recognize a file as a Python script, it must have the “.py” extension. Composite identifies Python scripts with a thumbnail that represents the Python logo:
   
2. Right-click on the script.
3. To run the script without any parameter choose “Run”.
4. To run the script with parameters choose "Run with Parameters" and type in the script arguments as you would in a shell.