my_game.py

import pygame
from pygame import locals

pygame.init()  # 初始化
# 创建一个窗口
screen = pygame.display.set_mode((1000, 600))
pygame.display.set_caption("孙xx")
FPS = pygame.time.Clock()  # pygame时钟，控制游戏速度（帧数）
# 载入图片
background = pygame.image.load('bg.png')    # 背景
road = pygame.image.load('road.png')      # 路
stone = pygame.image.load('stone.png')      # 石头
cacti = pygame.image.load('cacti.png')      # 仙人掌
apple = pygame.image.load('bush.png')      # 灌木丛
hero = [pygame.image.load('hero1.png'),
       pygame.image.load('hero2.png'),
       pygame.image.load('hero3.png'),
       pygame.image.load('hero4.png'),
       pygame.image.load('hero5.png')]
       
m = 0
j="runing" 
y=400
t=30

while True:
    for event in pygame.event.get():
        if event.type == locals.QUIT:
            # 接收到退出事件后退出程序
            exit()
        if event.type==locals.KEYDOWN:
            if event.key==locals.K_SPACE:
                if j =="runing":
                    j="up"
    if j =="up":
        if t>0:
            y=y-t
            t-=2
        else:
            j="down" 
    if j =="down":
        if t<=30:
           y=y+t
           t+=2     
        else:
            j="runing" 
            t=30          


    hero1=hero[m]
    if j=="runing":
        m+=1
        if m>4:
            m=0
    # 将背景图画上去
    screen.blit(background, (0, 0))
    screen.blit(road, (0, 500))
    screen.blit(hero1, (150, y))
    # 刷新画面
    pygame.display.update()
    FPS.tick(60)