save project

snake.py

 import pygame
 from pygame import locals
 from random import randint
-
+speed = 2
 # 初始化pygame，为使用硬件做准备
 pygame.init()
 
@@ -45,24 +45,26 @@ while True:
             if event.key == locals.K_DOWN and setheading != "up":
                 setheading = 'down'
                 snake_head = down
-
-    # 设置贪吃蛇的头部坐标
     if setheading == "right":
-        x += 30
+        x += 30 
     elif setheading == "left":
-        x -= 30
+        x -= 30 
     elif setheading == "up":
-        y -= 30
+        y -= 30 
     else:
-        y += 30
-
-    position.append((x, y))
-    
-    if x == apple_x and y == apple_y :
-        apple_x = randint(0,660)
-        apple_y = randint(0,480)
-    position.pop(0)
+        y += 30 
+    position.append((x,y))  
+    if x == apple_x and y == apple_y:
+        num1 = randint(1,22)
+        num2 = randint(1,16)
+        apple_x = num1 * 30 - 30
+        apple_y = num2 * 30 - 30
+        speed += 0.5
+    else:
+        position.pop(0)
 
+    if x < 0 or x > 630 or y < 0 or y > 450:
+        exit()
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去