Using Qt in Python via QML (instead of inline code) with the Material Design style

material_qt.py

import sys

from PySide2.QtQml import QQmlApplicationEngine
from PySide2.QtWidgets import QApplication
from PySide2.QtCore import Qt, QCoreApplication


if __name__ == "__main__":
    sys_argv = sys.argv
    sys_argv += ['--style', 'Material']
    app = QApplication(sys_argv)

    engine = QQmlApplicationEngine('view.qml')

    sys.exit(app.exec_())

view.qml

import QtQuick 2.12
import QtQuick.Controls 2.12
import QtQuick.Controls.Material 2.12

ApplicationWindow {
    visible: true

    Material.theme: Material.Dark
    Material.accent: Material.Purple

    title: "Qt Hello Material"

    width: 640
    height: 480

    Column {
        anchors.centerIn: parent

        RadioButton { text: qsTr("Smol") }
        RadioButton { text: qsTr("Medium");  checked: true }
        RadioButton { text: qsTr("Large") }
    }
}