python - Issue using classes imported from a module

Question

My assignment is to make a game, were supposed to have multiple modules to avoid clutter in one script. I'm having an issue with import a variable from one of the modules. So far I have a settings one, and a main one. The settings is pretty simple and goes:

class Settings():
def __init__(self):
 self.screen_width = 1920
 self.screen_height = 1080
 self.bg_color = (230, 230, 230)

Pretty simple, yet when I try to reference these variables it says "Unresolved attribute reference 'screen_width' for class 'Settings'

main goes as this:

import sys, pygame
from game_settings import Settings
def run_game():
 #Initialize the game and create the window
 pygame.init()
 screen = pygame.display.set_mode((Settings.screen_width,Settings.screen_height), pygame.FULLSCREEN)
 pygame.display.set_caption("Alien Invasion")
while True:
 #Listening for events
 for event in pygame.event.get():
 if event.type == pygame.QUIT:
 sys.exit()
 screen.fill(Settings.bg_color)
 pygame.display.flip()
run_game()

I thought maybe this would be a PyCharm issue, but found that it does the same thing in IDLE so what would be the correct way to import the variables?

Thanks for taking the time to read this!

• Andrés AG: I am definitely no expert, but arent bg_color , screen_width and scree_height part of the instances rather than the class itself? In other words, I dont think you can just access Settings.bg_color, I think you need to make a Settings object like s = Settings() and then you can do s.bg_color.
• Evan Theis: @danidee no it doesn't work
• Andrés AG: Btw, have a look at this article if you would like to learn more about this issue you are having docs.python.org/3/tutorial/classes.html
• Evan Theis: @AndrésAG Thanks, such a simple problem I was missing though. I knew mostly how to get it all except that I needed to create an instance.

Answer 1

You need to create an instance of your Settings class, since the attributes you set up in its __init__ method are instance attributes.

Try something like this:

def run_game():
 my_settings = Settings() # create Settings instance
 pygame.init()
 screen = pygame.display.set_mode((my_settings.screen_width, # lookup attributes on it
 my_settings.screen_height),
 pygame.FULLSCREEN)
 # ...

Answer 2

You need to create an instance of the Settings object: s = Settings()

Usage: s.bg_color, etc.

OR

Alter your Settings class like so and the properties are accessible statically:

class Settings():
 screen_width = 1920
 screen_height = 1080
 bg_color = (230, 230, 230)

Answer 3

Both files have to be in the same folder and you have to create an instance of your Settings class. Then you can access the properties of your instance.

main.py:

from game_settings import Settings
s = Settings()
print(s.bg_color)

game_settings.py:

class Settings():
 def __init__(self):
 self.screen_width = 1920
 self.screen_height = 1080
 self.bg_color = (230, 230, 230)

When you run main.py, the output will be:

(230, 230, 230)