main.py

import os
import sys
from PySide6.QtCore import QTimer, QUrl
from PySide6.QtGui import QGuiApplication
from PySide6.QtQuick import QQuickView

if __name__ == '__main__':
    app = QGuiApplication(sys.argv)

    timer = QTimer()
    timer.start(2000)

    view = QQuickView()
    qmlFile = os.path.join(os.path.dirname(__file__), 'view.qml')
    view.setSource(QUrl.fromLocalFile(os.path.abspath(qmlFile)))
    if view.status() == QQuickView.Error:
        sys.exit(-1)
    root = view.rootObject()

    timer.timeout.connect(root.updateRotater)

    view.show()
    res = app.exec_()
    # Deleting the view before it goes out of scope is required to make sure all child QML instances
    # are destroyed in the correct order.
    del view
    sys.exit(res)

view.qml

import QtQuick 2.0

Rectangle {
    id: page

    function updateRotater() {
        rotater.angle = rotater.angle + 45
    }

    width: 500; height: 200
    color: "lightgray"

    Rectangle {
        id: rotater
        property real angle : 0
        x: 240
        width: 100; height: 10
        color: "black"
        y: 95

        transform: Rotation {
            origin.x: 10; origin.y: 5
            angle: rotater.angle
            Behavior on angle {
                SpringAnimation {
                    spring: 1.4
                    damping: .05
                }
            }
        }
    }

}