How to make the "screen" variable accessible to all scripts in python/pygame

Question

I am making my own UI in python 2 and pygame. I have my main script that creates the "screen" variable for the rendering surface in pygame.

How could I go about letting other python scripts access - and render on - the surface of another script?

Answer 1

You can achieve the desired effect by passing your screen variable as a parameter on any call of your extensions modules. The easiest way would be to design your modules as classes whose __init__ method accept the screen to render on:

#extension1.py
class Main(whatever_base_class):
    def __init__(self, screen, *args, **kwargs):
        self.screen = screen
        ...
    def Draw(self):
        #use self.screen to draw on screen.

And from your main script:

from extension1 import Main

#define screen somehow
ext1 = Main(screen, ...)
ext1.Draw()

If you can't or don't want to force the creation/modification of an __init__ in your extensions, you can either rely on a def setup(screen) method or directly pass the screen variable to the Draw method.