save project

lesson3-diy3.py

@@ -56,14 +56,21 @@ while True:
         y -= 30
     else:
         y += 30
+    for j in position:
+        a,b=j
+        if a==x and b==y:
+            exit()
     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)   # 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
         score+=10
+    elif x<0 or x>630 or y<0 or y>450:
+        exit()
     else:
         position.pop(0)
     # 将背景图画上去