Force a function parameter type in Python?

Question

I have a function in a Python class that adds Interfaces to a list.

def RegisterAsListener(self, inListener):
    self.__TransitListeners.append(inListener)
         


        

Answer 1

Since i'm not the only one on this project, I don't want somebody calling the RegisterAsListener function with an incorrect data type

Document the function thoroughly, then let incorrect parameters throw exceptions. The user of RegisterAListener should be able to use the documentation to know what kind of data the function expects, and - if given incorrect parameters - the resulting exception should make it clear what the user of RegisterAListener did wrong.