解决PySide2的This application failed to start because no Qt platform plugin could be initialized问题

总结一下思路：国内博客中通常是修改环境变量，这点是完全没问题的，但是由于国内博客大多写的是pyqt而不是pyside2，所以配置环境变量有所区别。

其实解决问题的方法也是配置环境变量，只不过路径不能只写到plugin，而要把platform也加入进去，当然也可以在每次编程时先加入这段代码再继续自己的代码：

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

如果想要一劳永逸，那么就多打一条print看一下pyside2安装目录：

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
print(plugin_path)

把输出获得的路径复制一下（第二行）：
然后在环境变量中配置一下就可以了：

但配置环境还是有可能不行，那么有一个办法是基本可行的，也就是改包根目录下的__init__文件，在注释前加上上面的那串代码就可以（注意要把PySide2去掉）：

转载自科西嘉人

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