PyQt5安裝後報錯：This application failed to start because no Qt platform plugin could be initialized.

PyQt5安裝後運行報錯：This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem. 原因：沒有添加環境變量 解決：添加系統環境變量 變量名：QT_QPA_PLATFORM_PLUGIN_

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