a web UI to invoke a python script at server side

[Frank Cui]

Hey guys,
I'm working on to provide a lightweight web UI for providing an interface to invoke a python script(a sequential script which could involve some system calls) at the server side. The UI should collect some parameters for input into this python script, and conversely the output of the script needs to be returned to the web client side.
I haven't done much web programming before, can you provide some hints onhow this is usually implemented ?
ThanksFrank