PyQt4生成table,该如何处理

PyQt4生成table
我通过PyQt4生成了一个窗口，窗口上的菜单栏为“分级表”，请问要怎么写python,才能在单击“分级表”后在窗口里出现一个相应的table。

Python code

from PyQt4.QtGui import *from PyQt4.QtCore import *import sysQTextCodec.setCodecForTr(QTextCodec.codecForName("utf8"))class MainWindow(QMainWindow):    def __init__(self,parent=None):        super(MainWindow,self).__init__(parent)        self.resize(500,300)        self.setWindowTitle(self.tr("表窗口"))        self.table=QTableWidget()        self.createActions()        self.createMenus()      def createActions(self):        self.gradeAction = QAction(self.tr("分级表"),self)        self.gradeAction.setShortcut("Ctrl+G")        self.gradeAction.setStatusTip(self.tr("模块分级表"))               self.connect(self.gradeAction,SIGNAL("triggered()"),self.grade)    def createMenus(self):        profileMenu = self.menuBar().addMenu(self.tr("模块表(&T)"))        profileMenu.addAction(self.gradeAction)    def grade(self):        self.table.setColumnCount(2)                        self.table.setRowCount(40)         self.table.setItem(0,0,self.tr("ben"))        self.table.setItem(0,1,self.tr("ton" ))        self.table.setItem(0,2,self.tr("cap"))app=QApplication(sys.argv)main=MainWindow()main.show()app.exec_()

错误提示：>>> 
Traceback (most recent call last):
  File "D:\Python\Menu\self\1.py", line 29, in grade
  self.table.setItem(0,0,self.tr("ben"))
TypeError: QTableWidget.setItem(int, int, QTableWidgetItem): argument 3 has unexpected type 'QString'
>>> 
求解！！！

[解决办法]
参数类型传错了吧?看看库的帮助文档!
[解决办法]
QTableWidget.setItem (self, int row, int column, QTableWidgetItem item)
============================
newItem = QtGui.QTableWidgetItem(_fromUtf8('haha'))
self.tableWidget.setItem(0, 1, newItem)

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