Why do I need "sys.argv" to start a QApplication in PyQt?

python pyqt command-line-arguments qapplication
Sir2B picture Sir2B · Jan 14, 2015 · Viewed 10.2k times · Source

I try to understand what PyQt does. And one of the first things I didn't, was: 

QApplication(sys.argv)

Why do I have to give QApplication this argument? I know what sys.argv does. But in my Scripts I wouldn't need it.

Answer

dmg picture dmg · Jan 14, 2015

This calls the constructor of the C++ class QApplication. It uses sys.argv (argc and argv in C++) to initialize the QT application. There are a bunch of arguments that you can pass to QT, like styles, debugging stuff and so on.

Take a look at this for a full list of the options.

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