如何使用pyqt5在两个表单之间交换数据？

from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QLabel, QLineEdit, QPushButton
from PyQt5.QtCore import pyqtSignal, QObject

class Form1(QWidget):
    dataChanged = pyqtSignal(str)

    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        layout = QVBoxLayout()
        self.textbox = QLineEdit()
        self.button = QPushButton('Send Data')
        self.button.clicked.connect(self.sendData)
        layout.addWidget(self.textbox)
        layout.addWidget(self.button)
        self.setLayout(layout)

    def sendData(self):
        data = self.textbox.text()
        self.dataChanged.emit(data)


class Form2(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        layout = QVBoxLayout()
        self.label = QLabel()
        layout.addWidget(self.label)
        self.setLayout(layout)

    def updateLabel(self, data):
        self.label.setText(data)


class Communicate(QObject):
    dataChanged = pyqtSignal(str)


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

    form1 = Form1()
    form2 = Form2()

    communicate = Communicate()
    communicate.dataChanged.connect(form2.updateLabel)
    form1.dataChanged.connect(communicate.dataChanged)

    form1.show()
    form2.show()

    sys.exit(app.exec_())