如何制作python游戏，Flappy Bird's pipes出现？

import pygame
import random

pygame.init()

screen_width = 400
screen_height = 600
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption("Flappy Bird")

background_image = pygame.image.load("background.png")
bird_image = pygame.image.load("bird.png")

class Pipe:
    def __init__(self):
        self.pipe_image = pygame.image.load("pipe.png")
        self.x = screen_width
        self.y = random.randint(200, 400)
        self.speed = 5

    def move(self):
        self.x -= self.speed

    def draw(self):
        screen.blit(self.pipe_image, (self.x, self.y))

pipes = []

running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    screen.blit(background_image, (0, 0))

    # 创建管道
    if len(pipes) < 2:
        pipes.append(Pipe())

    # 移动和绘制管道
    for pipe in pipes:
        pipe.move()
        pipe.draw()

    pygame.display.update()