[Tutor] how to do "program chains"

[VSOFTSMITH@aol.com]

i am used to working in an environment where the user signs on with a 
password and is presented with a menu of choices of independent things they 
might want to do, eg

       1. admit patient
       2. display patient
      3. production run

with each choice a new program is called and executed. when complete it 
returns to the menu from which it was called.

some program transfers like to "production run" above are other menus.
there may be 300 programs that are accessible this way.
each program is small and easily maintained independently of the others

how do i do this in python? example code somewhere?

thanks for any help