save project

snake.py

@@ -61,9 +61,13 @@ while True:
         num2=random.randint(0,15)
         apple_x=num1*30
         apple_y=num2*30
-        a+=10
+        a+=100
     else:    
         position.pop(0)
+    if x>630 or x<0 or y>450 or y<0:
+        exit()
+    if position[-1] in position[:-1]:
+        exit()
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
@@ -73,9 +77,9 @@ while True:
         screen.blit(body, position[i])
     text='Score'+str(a)
     b=my_font.render(text,True,(0,0,0))
-    screen.blit(b, (560,0))
+    screen.blit(b, (0,0))
     # 将果实画上去
     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(9)
\ No newline at end of file