本示例python文件main.py代码与注释如下：

import osfrom pathlib import Pathimport sysfrom PySide6.QtCore import QObject, QTimer, QUrl, Signal, Slotfrom PySide6.QtGui import QGuiApplicationfrom PySide6.QtQuick import QQuickViewfrom PySide6.QtQml import QmlElementQML_IMPORT_NAME = "examples.signals.pytoqml2"#定义包名称QML_IMPORT_MAJOR_VERSION = 1#定义包版本@QmlElement#装饰器把类暴露给qmlclass RotateValue(QObject):    valueChanged = Signal(int, arguments=['val'])    def __init__(self):        super().__init__()        self.r = 0    @Slot()    def increment(self):        self.r = self.r + 10        self.valueChanged.emit(self.r)if __name__ == '__main__':    app = QGuiApplication(sys.argv)    view = QQuickView()    rotatevalue = RotateValue()#定义    timer = QTimer()#设置定时器    timer.start(500)#定时0.5秒开始    view.setInitialProperties({"rotatevalue": rotatevalue})#设置rotatevalue    qml_file = os.fspath(Path(__file__).resolve().parent / 'view.qml')    view.setSource(QUrl.fromLocalFile(qml_file))    if view.status() == QQuickView.Error:        sys.exit(-1)    timer.timeout.connect(rotatevalue.increment)#连接信号    view.show()    res = app.exec()        del view    sys.exit(res)

本示例qml文件view.qml界面代码与注释如下：

import QtQuickimport QtQml//导入定义的包import examples.signals.pytoqml2 1.0Rectangle {    id: page    width: 500; height: 200    color: "lightgray"    required property RotateValue rotatevalue//定义RotateValue属性    Text {        id: helloText        text: "Hello world!"        anchors.horizontalCenter: page.horizontalCenter        y: 30        font.pointSize: 24; font.bold: true    }    Connections {//连接信号        target: rotatevalue        function onValueChanged(val) {            helloText.rotation = val//改变helloText的位置        }    }}