让一个形状在Pygame中消失，然后重新出现

import pygame
import random

pygame.init()

width = 800
height = 600
window = pygame.display.set_mode((width, height))
pygame.display.set_caption("Shape Disappearing")

class Shape:
    def __init__(self):
        self.x = random.randint(0, width)
        self.y = random.randint(0, height)
        self.size = random.randint(10, 50)
        self.color = (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))
        self.visible = True

    def draw(self):
        if self.visible:
            pygame.draw.circle(window, self.color, (self.x, self.y), self.size)

    def disappear(self):
        self.visible = False

    def reappear(self):
        self.x = random.randint(0, width)
        self.y = random.randint(0, height)
        self.size = random.randint(10, 50)
        self.color = (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))
        self.visible = True

shape = Shape()

running = True
while running:
    window.fill((255, 255, 255))

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

    shape.draw()
    pygame.display.update()

    keys = pygame.key.get_pressed()
    if keys[pygame.K_SPACE]:
        shape.disappear()
    if keys[pygame.K_RETURN]:
        shape.reappear()