Just want to know what's the common way to react on events in python. There are several ways in other languages like callback functions, delegates, listener-structures and so on. 
Is there a common way? Which default language concepts or additional modules are there and which can you recommend?
I have seen listeners and callbacks used. But AFAIK there is no Python way. They should be equally feasible if the application in question is suitable.
Python: Callbacks, Delegates, ... ? What is common?