save project

snake.py

+# 导入pygame、locals模块
 import pygame
 from pygame import locals
 
 # 初始化pygame，为使用硬件做准备
 pygame.init()
+
+# 初始化FPSCLOCK
 FPSCLOCK=pygame.time.Clock()
+
+# 设置xy变量
 x=240
 y=120
-# 创建一个窗口
+
+# 设置位置列表
 position = [(180,90),(180,120),(210,120),(240,120)]
+
+# 创建一个窗口
 screen = pygame.display.set_mode((660, 480))
 
-# 背景
+# 导入背景、角色素材
 background = pygame.image.load('bg.png')
 right = pygame.image.load('right.png')
 left = pygame.image.load("left.png")
@@ -19,8 +27,10 @@ down = pygame.image.load("down.png")
 food = pygame.image.load('apple.png')
 body = pygame.image.load('body.png')
 
+# 初始化蛇头判断变量
 setheading = "right"
 
+# 初始化蛇头方向变量
 snake_tou = left
 
 while True:
@@ -29,6 +39,7 @@ while True:
         if event.type == locals.QUIT:
             # 接收到退出事件后退出程序
             exit()
+        # 判断键盘情况
         if event.type == locals.KEYDOWN:
             if event.key == locals.K_RIGHT and setheading != "left":
                 setheading = "right"
@@ -42,6 +53,7 @@ while True:
             if event.key == locals.K_DOWN and setheading != "up":
                 setheading = "down"
                 snake_tou = down
+    # 蛇头根据方向变换
     if snake_tou == right:
         x += 30
     elif snake_tou == left: