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import pygame
import random

# Initialize pygame
pygame.init()

# Constants
WIDTH, HEIGHT = 500, 600
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
FPS = 60
GRAVITY = 0.25
BIRD_JUMP = -7
PIPE_SPEED = 3

# Create game window
screen = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("Flappy Bird")

# Load images
bird_img = pygame.image.load('bird.png').convert_alpha()
pipe_img = pygame.image.load('pipe.png').convert_alpha()

# Bird class
class Bird(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.image = bird_img
        self.rect = self.image.get_rect(center=(100, HEIGHT // 2))
        self.velocity = 0

    def update(self):
        self.velocity += GRAVITY
        self.rect.y += self.velocity

    def jump(self):
        self.velocity = BIRD_JUMP

    def is_off_screen(self):
        return self.rect.top > HEIGHT or self.rect.bottom < 0

# Pipe class
class Pipe(pygame.sprite.Sprite):
    def __init__(self, inverted, xpos, ysize):
        super().__init__()
        self.image = pipe_img
        self.image = pygame.transform.scale(self.image, (80, 600))
        self.rect = self.image.get_rect(topleft=(xpos, -ysize) if inverted else (xpos, HEIGHT - ysize))
        self.inverted = inverted

    def update(self):
        self.rect.x -= PIPE_SPEED

# Main function
def main():
    clock = pygame.time.Clock()
    bird_group = pygame.sprite.GroupSingle(Bird())
    pipe_group = pygame.sprite.Group()

    spawn_pipe_event = pygame.USEREVENT + 1
    pygame.time.set_timer(spawn_pipe_event, 1500)

    running = True
    while running:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_SPACE:
                    bird_group.sprite.jump()
            if event.type == spawn_pipe_event:
                pipe_group.add(Pipe(False, WIDTH, random.randint(200, 400)))
                pipe_group.add(Pipe(True, WIDTH, random.randint(200, 400)))

        screen.fill(BLACK)

        bird_group.update()
        bird_group.draw(screen)

        pipe_group.update()
        pipe_group.draw(screen)

        pygame.display.flip()
        clock.tick(FPS)

if __name__ == "__main__":
    main()
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