Python builtins.ImportError：无法导入名称

Question

我正在用pygame制作太空射击游戏。 python文件越来越难以理解，因此我决定将这些类拆分为单独的文件，以便于处理。

我有两个文件，Test_Game.py和Playerclass.py。

在Test_Game.py中我做了：

from Playerclass import Player

在Playerclass.py中我做：

from Test_Game import gamedisplay

（Player是一个类）

当我运行Test_Game时，我得到的错误是：

Traceback (most recent call last):
  File "C:/Users/Home/Documents/Python/Programs and tutorials/Pygame/Own programs/Programs i've given up on/Space shooter 3 - Defender!/Test_Game.py", line 10, in <module>
    from Playerclass import Player
  File "C:\Users\Home\Documents\Python\Programs and tutorials\Pygame\Own programs\Programs i've given up on\Space shooter 3 - Defender!\Playerclass.py", line 3, in <module>
    from Test_Game import gamedisplay
  File "C:\Users\Home\Documents\Python\Programs and tutorials\Pygame\Own programs\Programs i've given up on\Space shooter 3 - Defender!\Test_Game.py", line 10, in <module>
    from Playerclass import Player
builtins.ImportError: cannot import name 'Player'

感谢所有帮助。