arcade库安装了却显示NameError: name 'arcade' is not defined，求解决方法！

刚学python的Arcade库明明用pip下载了arcade库，运行时却显示NameError: name 'arcade' is not defined。

代码：

from arcade import *
SCREEN_WIDTH = 800
SCREEN_HEIGHI = 600
SCREEN_TITLE = "Hello Codemao"

class MyDraw(arcade.Window):
    def __init__(self, Width, height, title):
        super().__init__(Width, height, title)
        self.setup()

    def setup(self):
        set_background_color(color.SKY_BLUE)

    def on_draw(self):
        start_render()
        self.mydraw()

    def mydraw(self):
        draw_rectangle_outline(400, 300, 400, 300, color.RED, 5)
        draw_line(0, 0, 800, 600, color.GREEN, 10)
        draw_line(0, 300, 800, 300, color.GREEN, 10)
        draw_line(800, 0, 0, 600, color.GREEN, 10)
        draw_line(400, 0, 400, 600, color.GREEN, 10)
        draw_point(400, 300, color.RED, 50)

if __name__ == "__main__":
    game = MyDraw(SCREEN_WIDTH, SCREEN_HEIGHI, SCREEN_TITLE)
    run()

报错信息：

Note: Installing the optional Shapely library will improve performance.
      However, Shapely does not run on Python 3.10 for macOS and Windows machines.
Traceback (most recent call last):
  File "I:\Python\课程\G5-2\绘制方块\绘制方块.py", line 6, in <module>
    class MyDraw(arcade.Window):
NameError: name 'arcade' is not defined
[Finished in 0.8s]

真不知道该咋办了，一脸懵逼

系统：Windows 10家庭版
软件：Python-3.9.7-amd64
注：安装时勾选了“Add Path”，把安装路径改到了D盘，其他没动

控制台 运行3个命令， 截图研究一下
path
where python
pip show arcade