PySide2或PyQt5 运行时提示This application failed to start because no Qt platform plugin could be initialized的解决办法

把 PySide2 或者 PyQt5 安装在解释器目录下的 \plugins\platforms 目录添加到环境变量Path中。

比如，我的环境就是把下面这个路径加到 环境变量 Path 中 c:\Python38\Lib\site-packages\PySide2\plugins\platforms

2. 

确保环境变量中没有中文

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