save project

snake.py

@@ -62,10 +62,18 @@ while True:
         y += 30
     position.append((x, y))
     if x==apple_x and y==apple_y:
-        apple_x = random.randint(0,660)
-        apple_y = random.randint(0,440)
+        num1 = random.randint(1,22)
+        num2 = random.randint(1,16)
+        apple_x = num1*30-30
+        apple_y = num2*30-30
+    else:
+        position.pop(0)
+    if x<0 or x>630 or y<0 or y>450:
+        exit()
+
+
+
 
-    position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去