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

python QT简介：http://www.byhy.net/tut/py/gui/qt_01/

这个例子开头是这样

import PySide2
from PySide2.QtWidgets import QApplication, QMainWindow, QPushButton,  QPlainTextEdit, QMessageBox

遇到一个问题

网上的大部分方法就是把下面代码放到开头

import sys,os
import PySide2dirname = os.path.dirname(PySide2.__file__)
plugin_path = os.path.join(dirname, 'plugins', 'platforms')
os.environ['QT_QPA_PLATFORM_PLUGIN_PATH'] = plugin_path

或者是把plugin_path路径添加到环境变量

或者是在这里注释前面把上面三行代码贴进去

其实不用 PySide2而直接用pyqt就行，也不会有这个问题，不用配置环境变量

from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton,  QPlainTextEdit, QMessageBox

就是单纯地把PySide2改为PyQT5

先不纠结细节，可以运行就好，接着往后看。

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