python植物大战僵尸四之添加坚果(学员)

import pygame
from pygame.locals import *
import sys
from Peashooter import Peashooter
from SunFlower import SunFlower
from WallNut import WallNut
# 初始化pygame
pygame.init()
size = (1200, 600)
# 设置屏幕宽高
screen = pygame.display.set_mode(size)
# 设置屏幕标题
pygame.display.set_caption("植物大战僵尸")
backgroundImg = pygame.image.load('material/images/background1.jpg').convert_alpha()
sunbackImg = pygame.image.load('material/images/SunBack.png').convert_alpha()
myfont = pygame.font.SysFont('arial', 30)
txtImg = myfont.render("1000", True, (0, 0, 0))
peashooter = Peashooter()
sunFlower = SunFlower()
wallNut = WallNut()
index = 0
clock = pygame.time.Clock()
while True:
    if index > 100:
        index = 0
    clock.tick(15)
    # 启动消息队列，获取消息并处理
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()
    screen.blit(backgroundImg, (0, 0))
    screen.blit(sunbackImg, (250, 30))
    screen.blit(txtImg, (300, 33))
    screen.blit(peashooter.images[index % 13], peashooter.rect)
    screen.blit(sunFlower.images[index % 13], sunFlower.rect)
    screen.blit(wallNut.images[index % 13], wallNut.rect)
    index += 1
    pygame.display.update()

import pygame
class WallNut:
    def __init__(self):
        self.images = [pygame.image.load('material/images/WallNut_{:02d}.png'.format(i)).convert_alpha() for i in
                       range(0, 13)]
        self.rect = self.images[0].get_rect()
        self.rect.top = 200
        self.rect.left = 250