Flappy Bird

import pygame, random

WIDTH = 600
HEIGHT = 800
GRAVITY = 1
JUMP_POWER = 20
GAME_SPEED = 5

class Pipe(pygame.sprite.Sprite):
    def __init__(self, category):
        super().__init__()
        self.height = random.randrange(HEIGHT/4, HEIGHT/2-50)
        self.image = pygame.Surface((90, self.height))
        self.image.fill((255,0,255))
        self.rect = self.image.get_rect()
        self.rect.left = WIDTH
        if category == 0:
            self.rect.top = 0
        else:
            self.rect.bottom = HEIGHT

    def update(self):
        self.rect.centerx -= GAME_SPEED

class Bird(pygame.sprite.Sprite): # inheritance
    def __init__(self):
        super().__init__()
        self.image = pygame.Surface((35,35))
        self.image.fill((209, 0, 0))
        self.rect = self.image.get_rect()
        self.rect.center = (100, 50)
        self.yspeed = 0  # the speed with which the bird is going down

    def update(self):
        self.yspeed += GRAVITY
        self.rect.move_ip(0, self.yspeed)

    def jump(self):
        self.yspeed = -JUMP_POWER

pygame.init()
window = pygame.display.set_mode((WIDTH, HEIGHT))
run = True
elements = pygame.sprite.Group()
pipes = pygame.sprite.Group()
clock = pygame.time.Clock() # helps us control the frame rate
event_make_pipe = pygame.USEREVENT + 1
pygame.time.set_timer(event_make_pipe, 1500)
player = Bird()
elements.add(player)
while run:
    clock.tick(60) # frame rate
    window.fill((0,0,0))
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:
                player.jump()
        if event.type == pygame.MOUSEBUTTONDOWN:
            player.jump()
        if event.type == event_make_pipe:
            p = Pipe(0)
            elements.add(p)
            pipes.add(p)
            p = Pipe(1)
            elements.add(p)
            pipes.add(p)
    if pygame.sprite.spritecollideany(player, pipes) or player.rect.bottom > HEIGHT or player.rect.top < 0:
        run = False
    elements.update()
    elements.draw(window)
    pygame.display.update()

pygame.quit()