save project

snake.py

@@ -44,8 +44,13 @@ while True:
                 setheading = 'down'
                 snake_head = down
     if x==apple_x and y==apple_y:
-        apple_x=random.randint(0,660)
-        apple_y=random.randint(0,480)
+        num1=random.randint(0,22)
+        num2=random.randint(0,16)
+        apple_x=30*num1-30
+        apple_y=30*num2-30
+    else:
+        position.pop(0)
+    position.append((x, y))
     # 设置贪吃蛇的头部坐标
     if setheading == "right":
         x += 30
@@ -55,8 +60,6 @@ while True:
         y -= 30
     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