save project

snake.py

 import random
 import pygame
 from pygame import locals
-Score=0
+score=0
 
 # 初始化pygame，为使用硬件做准备
 pygame.init()
@@ -18,7 +18,7 @@ body = pygame.image.load('body.png')        # 身体
 left = pygame.image.load('left.png')        # 头 朝左
 up = pygame.image.load('up.png')            # 头 朝上
 down = pygame.image.load('down.png')        # 头 朝下
-my_font=pygame.font.Font(' neuropol.ttf',18)
+my_font=pygame.font.Font('neuropol.ttf',18)
 x, y = 240, 120
 position = [(180, 90), (180, 120), (210, 120), (x, y)]
 apple_x=360
@@ -62,7 +62,8 @@ while True:
         apple_y=num2*30-30      
     else:
         position.pop(0)
-    # 将背景图画上去
+    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 
     screen.blit(snake_head, position[-1])
@@ -73,7 +74,7 @@ while True:
     # 将果实画上去
     screen.blit(food, (apple_x, apple_y))
     info="Score"+str(score)
-    text=my_font.render(info,True,(0,0,0)
+    text=my_font.render(info,True,(0,0,0))
     screen.blit(text,(540,10))
     # 刷新画面
     pygame.display.update()