save project

snake.py

 import pygame
 import random
 from pygame import locals
-
+z=3
 # 初始化pygame，为使用硬件做准备
 pygame.init()
 score=0
@@ -66,11 +66,15 @@ while True:
         apple_x=num1*30-30
         apple_y=num2*30-30
         score+=10
+        if z>2:
+            z+=random.randint(-2,5)
+        else:
+            z+=1
     else:
         position.pop(0)
     info="Score: " + str(score) 
     text=font.render(info,True,(0,0,0))
-    screen.blit(text,(530,0))
+    screen.blit(text,(0,0))
     if x<0 or x>630 or y<0 or y>450:
         exit()
     
@@ -79,9 +83,10 @@ while True:
     # 将贪吃蛇的身体画上去
     for i in range(len(position)-1):
         screen.blit(body, position[i])
+        
         if (x,y)==position[i]:
             exit()
     # 刷新画面
     screen.blit(food, (apple_x,apple_y))
     pygame.display.update()
-    FPSCLOCK.tick(3)
\ No newline at end of file
+    FPSCLOCK.tick(z)
\ No newline at end of file