Problem with custom events in wxpython

[Jimmy]

hi, all

I'm having a problem with creating custom events in wxpython.

I have a class A handling some data processing work and another class
B of GUI matter. I need GUI to display information when data in A is
updated.
I know cutom events in wxpython may work. But I found no material
paricularly
helpful :(

can anyone write me some demo code to show how to do this or ant
reference to
materials? thanks