(You can also check this code in the repository)

import os
from pathlib import Path
import sys
from PySide6.QtCore import QObject, QUrl, Slot
from PySide6.QtGui import QGuiApplication
from PySide6.QtQuick import QQuickView

class RotateValue(QObject):
    def __init__(self):
        self.r = 0

    # If a slot returns a value, the return value type must be explicitly
    # defined in the decorator.
    def val(self):
        self.r = self.r + 10
        return self.r

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

    rotatevalue = RotateValue()
    context = view.rootContext()
    context.setContextProperty("rotatevalue", rotatevalue)

    qml_file = os.fspath(Path(__file__).resolve().parent / 'view.qml')
    if view.status() == QQuickView.Error:
    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
import QtQuick 2.0

Rectangle {
    id: page

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

    Text {
        id: helloText
        text: "Hello world!"
        anchors.horizontalCenter: page.horizontalCenter
        y: 30
        font.pointSize: 24; font.bold: true

    Rectangle {
        id: button
        width: 150; height: 40
        color: "darkgray"
        anchors.horizontalCenter: page.horizontalCenter
        y: 120
        MouseArea {
            id: buttonMouseArea
            objectName: "buttonMouseArea"
            anchors.fill: parent
            onClicked: {
                helloText.rotation = rotatevalue.val()
        Text {
            id: buttonText
            text: "Press me!"
            anchors.horizontalCenter: button.horizontalCenter
            anchors.verticalCenter: button.verticalCenter
            font.pointSize: 16