STEP 9:网的方向不对！让我们翻转网络。
- 将存储"soccernet"的变量名称从sprite更改为net 。
- 点击并拖出Flip Right Left 。
- 将.flip_right_left()前面的名称从sprite更改为net以将其分配给网络！
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stage.set_axis(100)
stage.create_grid_overlay(10, "grey")
stage.set_background("soccerfield")
ballx = -80
bally = random.randint(-100,100)
# sprite = codesters.Sprite("image", x, y)
ball = codesters.Sprite("soccerball", ballx, bally)
netx = 90
nety = random.randint(-100,100)
# sprite = codesters.Sprite("image", x, y)
sprite = codesters.Sprite("soccernet", netx, nety)
