auto save

snake.py

@@ -55,7 +55,7 @@ while True:
     else:
         y += 30
     position.append((x, y))
-    position.pop(0)
+    
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
@@ -66,11 +66,20 @@ while True:
 
     # 将果实画上去
     screen.blit(food, (apple_x, apple_y))
-
+    #监测蛇身蛇尾
+    for i in range(len(position)-1):
+        if position[i] == (x,y):
+                exit()
     #随机刷新果实
     if x == apple_x and y == apple_y:
-        apple_x = 30 * random.randint(0,22)
-        apple_y = 30 * random.randint(0,16)
+        for i in range(len(position)-1):
+            apple_x = 30 * random.randint(0,21)
+            apple_y = 30 * random.randint(0,15)
+            while (apple_x,apple_y) == position[i]:
+                apple_x = 30 * random.randint(0,21)
+                apple_y = 30 * random.randint(0,15)
+    else:
+        position.pop(0)
 
     # 刷新画面
     pygame.display.update()