A boilerplate script for the pygame library

main.py

import pygame
import random

WIDTH = 720
HEIGHT = 480
FPS = 30

WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE = (0, 0, 255)

pygame.init()
screen = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("Lights & Shadows")
clock = pygame.time.Clock()

running = True

while running:

    clock.tick(FPS)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    screen.fill(BLUE)

    pygame.draw.rect(screen, RED, [WIDTH / 2 - 200, HEIGHT / 2 - 200, 200, 200], 2)
    pygame.draw.rect(screen, GREEN, [WIDTH / 2, HEIGHT / 2 - 50, 200, 150])

    pygame.display.flip()       


pygame.quit()