I am making a game, a simple 2d RPG in python, using pygame. I'm now adding zooming in and out using the scrollwheel. I have a file called stuff.py along with my main.py file and a bunch of other files (player.py, enemy1.py, enemySpawner.py, chest.py etc.). In the stuff.py file, I have an int called sizeofEverything, and everything is scaled ( square shape) to sizeofEverything. Main.py  is the only file that is executed, so In main.py, I detect if the scrollWheel has been interacted with, and if it has been, I want to change sizeofEverything. The problem is, that would just change the local copy of sizeofEverything that I imported into main.py .I need some way to change it, from the main.py file, so that it also updates in all the other files (enemy1.py, player.py etc. ) How would this be done?
I'd recommend rethinking how the variables are defined and how you change them. For example, instead of trying to change a variable in another file, perhaps you can pass a variable to a function in another file, and store all the variables in the main script. Global variables tend to be frowned upon, but only because they make things pretty messy overall.
Globals between files in python