python3 multiproceso datos de actualización de interfaz de usuario, la interfaz de actualización pyqt5

from PyQt5.QtCore import QThread, pyqtSignal, QDateTime, QObject
from PyQt5.QtWidgets import QApplication, QDialog, QLineEdit
import time
import sys


class BackendThread(QObject):
    # 通过类成员对象定义信号
    update_date = pyqtSignal(str)

    # 处理业务逻辑
    def run(self):
        while True:
            data = QDateTime.currentDateTime()
            currTime = data.toString("yyyy-MM-dd hh:mm:ss")
            self.update_date.emit(str(currTime))
            time.sleep(1)


class Window(QDialog):
    def __init__(self):
        QDialog.__init__(self)
        self.setWindowTitle('PyQt 5界面实时更新例子')
        self.resize(400, 100)
        self.input = QLineEdit(self)
        self.input.resize(400, 100)
        self.initUI()

    def initUI(self):
        # 创建线程
        self.backend = BackendThread()
        # 连接信号
        self.backend.update_date.connect(self.handleDisplay)
        self.thread = QThread()
        self.backend.moveToThread(self.thread)
        # 开始线程
        self.thread.started.connect(self.backend.run)
        self.thread.start()

    # 将当前时间输出到文本框
    def handleDisplay(self, data):
        self.input.setText(data)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = Window()
    win.show()
    sys.exit(app.exec_())