main (start)

import pygame, sys, time
from settings import *

class Game:
    def __init__(self):

        # setup
        pygame.init()
        self.display_surface = pygame.display.set_mode((WINDOW_WIDTH,WINDOW_HEIGHT))
        pygame.display.set_caption('Flappy Bird')
        self.clock = pygame.time.Clock()

    def run(self):
        last_time = time.time()
        while True:

            # delta time
            dt = time.time() - last_time
            last_time = time.time()

            # event loop
            for event in pygame.event.get():
                if event.type == pygame.QUIT:
                    pygame.quit()
                    sys.exit()

            # game logic

            pygame.display.update()
            self.clock.tick(FRAMERATE)

if __name__ == '__main__':
    game = Game()
    game.run()