Question on passing function as argument

[matthew]

Hi,

Howto pass a func as an argument to a list?

Given:

     def add_listener(self, event, listener = None):
         print event, " : ", listener
         if event in self.event_list:
             for item in listener:
                 self.event_list[event].append(item)

<main>
event.add_listener('linear', ['linear']) correctly adds 'linear' to list

but if I do:-

event.add_listener('linear', [calc_position(params)])

the function seems to execute 'in-place' and the event_list[event] shows 
None.

What am I doing wrong? Thanks. matthew.