求解答 pyqt中单击pushbutton把QtextEdit里的内容读到QTextBrowser

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'zzb.ui'
#
# Created by: PyQt5 UI code generator 5.10.1
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(995, 726)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.widget = QtWidgets.QWidget(self.centralwidget)
        self.widget.setGeometry(QtCore.QRect(0, 0, 991, 671))
        self.widget.setObjectName("widget")
        self.verticalLayout_2 = QtWidgets.QVBoxLayout(self.widget)
        self.verticalLayout_2.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout_2.setObjectName("verticalLayout_2")
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.label = QtWidgets.QLabel(self.widget)
        self.label.setObjectName("label")
        self.horizontalLayout.addWidget(self.label)
        self.lineEdit = QtWidgets.QLineEdit(self.widget)
        self.lineEdit.setObjectName("lineEdit")
        self.horizontalLayout.addWidget(self.lineEdit)
        self.pushButton = QtWidgets.QPushButton(self.widget)
        self.pushButton.setObjectName("pushButton")
        self.horizontalLayout.addWidget(self.pushButton)
        self.verticalLayout_2.addLayout(self.horizontalLayout)
        self.verticalLayout = QtWidgets.QVBoxLayout()
        self.verticalLayout.setObjectName("verticalLayout")
        self.label_2 = QtWidgets.QLabel(self.widget)
        self.label_2.setObjectName("label_2")
        self.verticalLayout.addWidget(self.label_2)
        self.textEdit = QtWidgets.QTextEdit(self.widget)
        self.textEdit.setObjectName("textEdit")
        self.verticalLayout.addWidget(self.textEdit)
        self.pushButton_2 = QtWidgets.QPushButton(self.widget)
        self.pushButton_2.setObjectName("pushButton_2")
        self.verticalLayout.addWidget(self.pushButton_2)
        self.label_3 = QtWidgets.QLabel(self.widget)
        self.label_3.setObjectName("label_3")
        self.verticalLayout.addWidget(self.label_3)
        self.textBrowser = QtWidgets.QTextBrowser(self.widget)
        self.textBrowser.setObjectName("textBrowser")
        self.verticalLayout.addWidget(self.textBrowser)
        self.verticalLayout_2.addLayout(self.verticalLayout)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 995, 26))
        self.menubar.setObjectName("menubar")
        self.menu = QtWidgets.QMenu(self.menubar)
        self.menu.setObjectName("menu")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.actionOpen_file = QtWidgets.QAction(MainWindow)
        self.actionOpen_file.setCheckable(True)
        self.actionOpen_file.setObjectName("actionOpen_file")
        self.menu.addAction(self.actionOpen_file)
        self.menubar.addAction(self.menu.menuAction())


        data = self.textEdit.toPlainText()
        print("aaaaa")
        print(data)
        self.pushButton_2.clicked.connect(lambda: self.textBrowser.setText("aaaaaaaa"))


        self.retranslateUi(MainWindow)
        self.pushButton.clicked.connect(MainWindow.openfile_jc)
        self.actionOpen_file.triggered.connect(MainWindow.openfile_jc)

        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label.setText(_translate("MainWindow", "纠错文本目录"))
        self.pushButton.setText(_translate("MainWindow", "打开纠错文本"))
        self.label_2.setText(_translate("MainWindow", "请输入你要纠错的段落"))
        self.pushButton_2.setText(_translate("MainWindow", "OK"))
        self.label_3.setText(_translate("MainWindow", "纠错后的段落"))
        self.menu.setTitle(_translate("MainWindow", "功能"))
        self.actionOpen_file.setText(_translate("MainWindow", "打开文档"))
        self.actionOpen_file.setShortcut(_translate("MainWindow", "Ctrl+O"))

问题QtextEdit里的内容没有读到，用print打印没有数据

 

运行界面代码

import sys
from PyQt5.QtWidgets import QApplication,QMainWindow,QFileDialog
from zzb import Ui_MainWindow


class MainWindow(QMainWindow):
    def __init__(self,parent=None):
        super(MainWindow, self).__init__(parent)
        self.ui=Ui_MainWindow()
        self.ui.setupUi(self)


    def openfile_jc(self):
        fileName1, filetype = QFileDialog.getOpenFileName(self,
                                                          "选取文件",
                                                          "C:/",
                                                          "All Files (*);;Text Files (*.txt)")
        print(fileName1, filetype)
        #self.Openfile1.setStatusTip('正在打开+fileName1')

    def savefile_jc(self):
        fileName2, ok2 = QFileDialog.getSaveFileName(self,
                                                     "文件保存",
                                                     "C:/",
                                                     "All Files (*);;Text Files (*.txt)")
    '''def copytext(self):'''


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

求各位大佬解答，一个刚学习pyqt的小萌新