Create a Pygame window with the corresponding input:

import sys
import pygame

def run_game():
    #Initialize the game and create screen objects
    pygame.init() #Check if pygame package is complete
    screen=pygame.display.set_mode((1200,800))#Create display window
    pygame.display.set_caption("Alien Invasion")

    #Start the main cycle of the game
    while True:
        #Monitor mouse and keyboard events
        for event in pygame.event.get():
            if event.type==pygame.QUIT:
                sys.exit()

        #Make the most recently drawn screen visible
        pygame.display.flip()

run_game()

The pygame.init() method checks if the pygame package is complete.

The pyGame. display.flip() method makes the recently drawn screen visible. Each time you move the game's elements, display.flip() will constantly update the screen to show the latest location of the elements.

Set the background color:

import sys
import pygame

def run_game():
    #Initialize the game and create screen objects
    pygame.init()
    screen=pygame.display.set_mode((1200,800))
    pygame.display.set_caption("Alien Invasion")
    #Set screen color
    bg_color=(230,230,230)
    #Start the main cycle of the game
    while True:
        #Monitor mouse and keyboard events
        for event in pygame.event.get():
            if event.type==pygame.QUIT:
                sys.exit()
        #Redraw the screen every time you cycle
        screen.fill(bg_color)
        #Make the most recently drawn screen visible
        pygame.display.flip()

run_game()

screen.fill() takes a color parameter and fills the screen with that color.

To create a settings class:

Store the settings in the game in one place to make function calls easier.

Setting class:

class Setting():
    def __init__(self):
        self.screen_width=1200
        self.screen_height=800
        self.bgcolor=(230,230,230)

Modified main program:

import sys
import pygame
#Import settings class
from setting import Setting

def run_game():
    #Initialize the game and create screen objects
    pygame.init()
    ai_setting=Setting()
    screen=pygame.display.set_mode((ai_setting.screen_width,ai_setting.screen_height))
    pygame.display.set_caption("Alien Invasion")
    #Start the main cycle of the game
    while True:
        #Monitor mouse and keyboard events
        for event in pygame.event.get():
            if event.type==pygame.QUIT:
                sys.exit()
        #Redraw the screen every time you cycle
        screen.fill(ai_setting.bgcolor)
        #Make the most recently drawn screen visible
        pygame.display.flip()

run_game()