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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.
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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.
The QApplication class manages the GUI application's control flow and main settings. It specializes in the QGuiApplication with some functionality needed for QWidget based applications. It handles widget specific initialization, finalization.
sys. argv is a list in Python that contains all the command-line arguments passed to the script. It is essential in Python while working with Command Line arguments.
The sys. argv parameter is a list of arguments from a command line. Python scripts can be run from the shell. It is a way how we can control the startup of our scripts.
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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QApplication takes a list of strings as input.
So you can forward sys.argv or simply an empty list:
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