Sample script to use command line arguments in Qt (QML)

sample.py

#!/usr/bin/env python3

from PySide2.QtCore import Slot
from PySide2.QtCore import Signal
from PySide2.QtCore import QUrl
from PySide2.QtCore import QObject
from PySide2.QtGui import QGuiApplication
from PySide2.QtQml import QQmlApplicationEngine
from PySide2.QtQml import qmlRegisterType

import os
import sys
import argparse


class Backend(QObject):
    def __init__(self, parent=None):
        QObject.__init__(self, parent)

    @Slot(list)
    def load_args(self, args):
        description = "foo"
        parser = argparse.ArgumentParser(
            description=description,
            add_help=False,
        )
        parser.add_argument(
            "--bool",
            action="store_true",
            help="some boolean option",
        )
        parser.add_argument(
            "strings",
            nargs="+",
            help="some strings",
        )

        parsed_args, _ = parser.parse_known_args(args[1:])
        print(args)
        print(parsed_args)




def main():
    app = QGuiApplication(sys.argv)
    qmlRegisterType(Backend, "PythonBackendLibrary", 1, 0, "PythonBackend")

    qml_file = "sample.qml"
    current_dir = os.path.dirname(os.path.realpath(__file__))
    filename = os.path.join(current_dir, qml_file)

    backend = Backend()
    engine = QQmlApplicationEngine()
    win = engine.rootContext()
    engine.load(QUrl.fromLocalFile(filename))

    if not engine.rootObjects():
        sys.exit(-1)
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

sample.qml

import QtQuick 2.0
import QtQuick.Controls 2.0

import PythonBackendLibrary 1.0

ApplicationWindow {
    id: root
    width: 100
    height: 100
    visible: true
    title: "Sample Application"

    PythonBackend {
        id: backend

        Component.onCompleted: load_args(Qt.application.arguments)
    }
}