问题：This application failed to start because no Qt platform plugin could be initialized. Reinstalling

错误提示：This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

翻译：此应用程序无法启动，因为无法初始化任何Qt平台插件。重新安装应用程序可以解决此问题。

解决办法：从"Python\Python311\Lib\site-packages"中，把"PyQt5"和"pyqt5_plugins"两个文件夹复制到Python\Python311\Lib安装目录下。 

例如：
从"C:\Users\Administrator\AppData\Local\Programs\Python\Python311\Lib\site-packages"把“PyQt5”文件夹、“pyqt5_plugins”文件夹复制到"C:\Users\Administrator\AppData\Local\Programs\Python\Python311\Lib"下。