pyqt小白，做了一个小窗口，点击按钮打开含qtablewidget的窗口，在窗口里可以输入内
容。问题出在再次打开时又打开了一个新的窗口，里面的内容清空了。想问问大家如何保存
上一次输入的内容，再次打开时显示的是之前输入的内容。谢谢大家啦！代码如下：
这是主程序代码：

from PyQt4 import QtCore, QtGui
from ui_qtable import Ui_Table

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(344, 244)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.pushButton = QtGui.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(110, 80, 121, 61))
        font = QtGui.QFont()
        font.setPointSize(17)
        self.pushButton.setFont(font)
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtGui.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 344, 23))
        self.menubar.setObjectName(_fromUtf8("menubar"))
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtGui.QStatusBar(MainWindow)
        self.statusbar.setObjectName(_fromUtf8("statusbar"))
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
        
        self.pushButton.clicked.connect(self.PushFunc)

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
        self.pushButton.setText(_translate("MainWindow", "Push", None))
    
    def PushFunc(self):
        self.another = Ui_Table()
        self.table = QtGui.QMainWindow()
        self.another.setupUi(self.table)
        
        self.table.show()
    
if __name__ ==  "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    Question = QtGui.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(Question) 
    Question.show()
    sys.exit(app.exec_())    

Dies ist das Qtablewidget-Fenster:

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_Table(QtGui.QWidget):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(422, 196)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.tableWidget = QtGui.QTableWidget(self.centralwidget)
        self.tableWidget.setGeometry(QtCore.QRect(0, 0, 421, 171))
        self.tableWidget.setObjectName(_fromUtf8("tableWidget"))
        self.tableWidget.setColumnCount(4)
        self.tableWidget.setRowCount(4)
        item = QtGui.QTableWidgetItem()
        self.tableWidget.setVerticalHeaderItem(0, item)
        item = QtGui.QTableWidgetItem()
        self.tableWidget.setVerticalHeaderItem(1, item)
        item = QtGui.QTableWidgetItem()
        self.tableWidget.setVerticalHeaderItem(2, item)
        item = QtGui.QTableWidgetItem()
        self.tableWidget.setVerticalHeaderItem(3, item)
        item = QtGui.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(0, item)
        item = QtGui.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(1, item)
        item = QtGui.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(2, item)
        item = QtGui.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(3, item)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtGui.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 422, 23))
        self.menubar.setObjectName(_fromUtf8("menubar"))
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtGui.QStatusBar(MainWindow)
        self.statusbar.setObjectName(_fromUtf8("statusbar"))
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
        item = self.tableWidget.verticalHeaderItem(0)
        item.setText(_translate("MainWindow", "1", None))
        item = self.tableWidget.verticalHeaderItem(1)
        item.setText(_translate("MainWindow", "2", None))
        item = self.tableWidget.verticalHeaderItem(2)
        item.setText(_translate("MainWindow", "3", None))
        item = self.tableWidget.verticalHeaderItem(3)
        item.setText(_translate("MainWindow", "4", None))
        item = self.tableWidget.horizontalHeaderItem(0)
        item.setText(_translate("MainWindow", "新建列", None))
        item = self.tableWidget.horizontalHeaderItem(1)
        item.setText(_translate("MainWindow", "新建列", None))
        item = self.tableWidget.horizontalHeaderItem(2)
        item.setText(_translate("MainWindow", "新建列", None))
        item = self.tableWidget.horizontalHeaderItem(3)
        item.setText(_translate("MainWindow", "新建列", None))