How to react to event?

Question

Python

Let's say for each event something should happen.

Let's say there are 5 events:

[ 1, 2, 3, 4, 5 ]

And each of the events has a function that changes the background color.

Question:
How to correctly bind events to the functions to which they relate, i.e. when event 3 occurs, the window color should turn red and when event 1 occurs, white, etc...