您不能像这样复制它，如果要实现项目，则可以使插槽返回值：
main.py
from PySide2 import QtCore, QtGui, QtQmlclass Calculator(QtCore.QObject): # Slot for summing two numbers @QtCore.Slot(int, int, result=int) def sum(self, arg1, arg2): return arg1 + arg2 # Slot for subtraction of two numbers @QtCore.Slot(int, int, result=int) def sub(self, arg1, arg2): return arg1 - arg2if __name__ == "__main__": import os import sys # Create an instance of the application app = QtGui.QGuiApplication(sys.argv) # Create QML engine engine = QtQml.QQmlApplicationEngine() # Create a calculator object calculator = Calculator() # And register it in the context of QML engine.rootContext().setContextProperty("calculator", calculator) # Load the qml file into the engine file = os.path.join(os.path.dirname(os.path.realpath(__file__)), "main.qml") engine.load(file) engine.quit.connect(app.quit) sys.exit(app.exec_())main.qml
import QtQuick 2.5import QtQuick.Controls 1.4import QtQuick.Layouts 1.2ApplicationWindow { visible: true width: 640 height: 240 title: qsTr("PyQt5 love QML") color: "whitesmoke" GridLayout { anchors.top: parent.top anchors.left: parent.left anchors.right: parent.right anchors.margins: 9 columns: 4 rows: 4 rowSpacing: 10 columnSpacing: 10 Text { text: qsTr("First number") } // Input field of the first number TextField { id: firstNumber } Text { text: qsTr("Second number") } // Input field of the second number TextField { id: secondNumber } Button { height: 40 Layout.fillWidth: true text: qsTr("Sum numbers") Layout.columnSpan: 2 onClicked: { // Invoke the calculator slot to sum the numbers sumResult.text = calculator.sum(firstNumber.text, secondNumber.text) } } Text { text: qsTr("Result") } // Here we see the result of sum Text { id: sumResult } Button { height: 40 Layout.fillWidth: true text: qsTr("Subtraction numbers") Layout.columnSpan: 2 onClicked: { // Invoke the calculator slot to subtract the numbers subResult.text = calculator.sub(firstNumber.text, secondNumber.text) } } Text { text: qsTr("Result") } // Here we see the result of subtraction Text { id: subResult } }}注意：将 PyQt5更改
Slot为
pyqtSlot。
