PyQt4 QMainWindow()

#!/usr/bin/python
#--coding:GBK--

from PyQt4.QtGui import * 
from PyQt4.QtCore import * 
import sys,os 
 
class MainWindow(QMainWindow): 
 def __init__(self,parent=None): 
  #super(MainWindow,self).__init__(parent)
  QMainWindow.__init__(self,parent)
  self.setWindowTitle("QMainWindow")
  self.setWindowIcon(QIcon(r"C:\shiquan\PyQt\new_test\pic\winlearn.png"))
  self.text=QTextEdit() 
  self.setCentralWidget(self.text) 
       
  self.createActions() 
  self.createMenus() 
  self.createToolBars() 
      
 def createActions(self): 
  self.fileOpenAction=QAction(QIcon(r"C:\shiquan\PyQt\new_test\pic\beyone.png"),"打开",self) 
  self.fileOpenAction.setShortcut("Ctrl+O") 
  self.fileOpenAction.setStatusTip("打开一个文件") 
  self.connect(self.fileOpenAction,SIGNAL("triggered()"),self.slotOpenFile) 

  self.fileNewAction=QAction(QIcon(r"C:\shiquan\PyQt\new_test\pic\cc.png"),"新建",self) 
  self.fileNewAction.setShortcut("Ctrl+N") 
  self.fileNewAction.setStatusTip("新建一个文件") 
  self.connect(self.fileNewAction,SIGNAL("triggered()"),self.slotNewFile) 
      
  self.fileSaveAction=QAction(QIcon(r"C:\shiquan\PyQt\new_test\pic\ctrix.png"),"保存",self) 
  self.fileSaveAction.setShortcut("Ctrl+S") 
  self.fileSaveAction.setStatusTip("保存文件") 
  self.connect(self.fileSaveAction,SIGNAL("triggered()"),self.slotSaveFile) 

  self.exitAction=QAction(QIcon(r"C:\shiquan\PyQt\new_test\pic\flash.png"),"退出",self) 
  self.exitAction.setShortcut("Ctrl+Q") 
  self.setStatusTip("退出") 
  self.connect(self.exitAction,SIGNAL("triggered()"),self.close) 
 
  self.cutAction=QAction(QIcon(r"C:\shiquan\PyQt\new_test\pic\intel.png"),"剪切",self) 
  self.cutAction.setShortcut("Ctrl+X") 
  self.cutAction.setStatusTip("剪切到粘贴板") 
  self.connect(self.cutAction,SIGNAL("triggered()"),self.text.cut) 

  self.copyAction=QAction(QIcon(r"C:\shiquan\PyQt\new_test\pic\pdf.png"),"复制",self) 
  self.copyAction.setShortcut("Ctrl+C") 
  self.copyAction.setStatusTip("复制到粘贴板") 
  self.connect(self.copyAction,SIGNAL("triggered()"),self.text.copy) 
 
  self.pasteAction=QAction(QIcon(r"C:\shiquan\PyQt\new_test\pic\pad.png"),"粘贴",self) 
  self.pasteAction.setShortcut("Ctrl+V") 
  self.pasteAction.setStatusTip("粘贴内容到当前处") 
  self.connect(self.pasteAction,SIGNAL("triggered()"),self.text.paste) 

  self.aboutAction=QAction(QIcon(r"C:\shiquan\PyQt\new_test\pic\flash.png"),"关于",self) 
  self.connect(self.aboutAction,SIGNAL("triggered()"),self.slotAbout) 

 def createMenus(self): 
  fileMenu=self.menuBar().addMenu("文件")
  newMenu = QMenu(fileMenu)
  newMenu.setTitle("New")
  newMenu.addAction("New Word")
  newMenu.addAction("New Excel")
  fileMenu.addMenu(newMenu)
  
  fileMenu.addAction(self.fileNewAction) 
  fileMenu.addAction(self.fileOpenAction) 
  fileMenu.addAction(self.fileSaveAction) 
  fileMenu.addAction(self.exitAction) 

  editMenu=self.menuBar().addMenu("编辑")
  editMenu.addAction(self.copyAction) 
  editMenu.addAction(self.cutAction) 
  editMenu.addAction(self.pasteAction) 

  aboutMenu=self.menuBar().addMenu("帮助") 
  aboutMenu.addAction(self.aboutAction) 
 
 def createToolBars(self): 
  fileToolBar=self.addToolBar("File") 
  fileToolBar.addAction(self.fileNewAction) 
  fileToolBar.addAction(self.fileOpenAction) 
  fileToolBar.addAction(self.fileSaveAction) 

  editTool=self.addToolBar("Edit") 
  editTool.addAction(self.copyAction) 
  editTool.addAction(self.cutAction) 
  editTool.addAction(self.pasteAction)

  aboutTool=self.addToolBar("About") 
  aboutTool.addAction(self.aboutAction) 

 def slotNewFile(self): 
  #newWin=MainWindow() 
  #newWin.show() 
  os.popen("notepad")
 
 def slotOpenFile(self): 
  fileName=QFileDialog.getOpenFileName(self,"Open file dialog",".","Python file:(*.py)")
  if os.path.exists(fileName):
   data = open(fileName).read()
   print ("You select file:",fileName)
   self.text.setText(data) 
  else:
   print("No file sepcified!")
   pass

 def loadFile(self,fileName): 
  file=QFile(fileName) 
  if file.open(QIODevice.ReadOnly|QIODevice.Text): 
   textStream=QTextStream(file) 
   while textStream.atEnd()==False: 
    self.text.append(textStream.readLine()) 

 def slotSaveFile(self): 
  #pass 
  save_fileName = QFileDialog.getSaveFileName(self,"Save Image",".","Image Files(*.py)")
  self.text.setText(save_fileName)
  
 
 def slotAbout(self): 
  QMessageBox.about(self,"about me","这是我们的第一个例子")
       
 def closeEvent(self,event):
  reply = QMessageBox.question(self,"Message","Are you sure to quit?",QMessageBox.Yes,QMessageBox.No)
  if reply == QMessageBox.Yes:
   event.accept()
  else:
   event.ignore()
   
app=QApplication(sys.argv) 
main=MainWindow()
main.resize(500,600) 
main.show() 
app.exec_()