auto save

snake.py

 import pygame
 from pygame import locals
 import random
+
 # 初始化pygame，为使用硬件做准备
 pygame.init()
 
@@ -19,8 +20,8 @@ down = pygame.image.load('down.png')        # 头 朝下
 
 x, y = 240, 120
 position = [(180, 90), (180, 120), (210, 120), (x, y)]
-apple_x=360
-apple_y=300
+apple_x = 360   # 苹果横坐标
+apple_y = 300   # 苹果纵坐标
 
 setheading = "right"
 snake_head = right
@@ -54,12 +55,12 @@ while True:
     else:
         y += 30
     position.append((x, y))
-    
+    # 贪吃蛇吃到了苹果
     if x == apple_x and y == apple_y:
-        num1 = random.randint(1,22)
-        num2 = random.randint(1,16)
-        apple_x=num1*30-30
-        apple_y=num2*30-30
+        num1= random.randint(1, 22)   # 横排第几个格子
+        num2 = random.randint(1, 16)   # 竖排第几个格子
+        apple_x = 30*num1-30   # 苹果的x坐标
+        apple_y = 30*num2-30   # 苹果的y坐标
     else:
         position.pop(0)
     # 将背景图画上去
@@ -71,7 +72,7 @@ while True:
         screen.blit(body, position[i])
 
     # 将果实画上去
-    screen.blit(food, (360, 300))
+    screen.blit(food, (apple_x, apple_y))
     # 刷新画面
     pygame.display.update()
-    FPSCLOCK.tick(3)
\ No newline at end of file
+    FPSCLOCK.tick(3)