/tmp/snapshot-pyside-6.2-rel/pyside-setup/examples/declarative/signals/pytoqml1

(You can also check this code in the repository)

main.py

import os
from pathlib import Path
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()
    qml_file = os.fspath(Path(__file__).resolve().parent / 'view.qml')
    view.setSource(QUrl.fromLocalFile(qml_file))
    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

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
                }
            }
        }
    }

}