PyQT实现多窗口切换

最近做个软件，用PyQT写的，在实现菜单栏点击弹出新窗口的时候严重被卡壳，发现用WxPython的思想和方式来做完全无法实现。PyQT的中文资料实在是太少了。看了点英文资料和QT的资料，逆推PyQT的实现方法，总算搞定。下面是一个小demo。

主界面的代码如下所示：

# -*- coding: utf-8 -*- 
from PyQt4 import QtCore, QtGui
from dialog1 import Dialog1
from dialog2 import Dialog2
import sys 
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 MainWindow(QtGui.QWidget):  
  dialog1_signal = QtCore.pyqtSignal()     #定义一个无参数的信号，串口设定与子站初始化信号
  dialog2_signal = QtCore.pyqtSignal()     #定义一个无参数的信号，串口设定与子站初始化信号
  exit_signal = QtCore.pyqtSignal()     #定义一个无参数的信号，串口设定与子站初始化信号 
  def __init__(self):
    super(MainWindow,self).__init__() 
  def setupUi(self, Form):
    Form.setObjectName(_fromUtf8("Form"))
    Form.resize(400, 300)
    self.form = Form
    self.pushButton = QtGui.QPushButton(Form)
    self.pushButton.setGeometry(QtCore.QRect(70, 90, 75, 23))
    self.pushButton.setObjectName(_fromUtf8("pushButton"))
    self.pushButton_2 = QtGui.QPushButton(Form)
    self.pushButton_2.setGeometry(QtCore.QRect(240, 90, 75, 23))
    self.pushButton_2.setObjectName(_fromUtf8("pushButton_2"))
    self.pushButton_3 = QtGui.QPushButton(Form)
    self.pushButton_3.setGeometry(QtCore.QRect(150, 160, 75, 23))
    self.pushButton_3.setObjectName(_fromUtf8("pushButton_3"))
    self.label = QtGui.QLabel(Form)
    self.label.setGeometry(QtCore.QRect(170, 40, 54, 16))
    self.label.setObjectName(_fromUtf8("label")) 
    self.retranslateUi(Form)
    QtCore.QMetaObject.connectSlotsByName(Form) 
    #信号连接到指定槽
    self.pushButton.clicked.connect(self.on_pushButton_clicked)
    self.pushButton_2.clicked.connect(self.on_pushButton_2_clicked)
    self.pushButton_3.clicked.connect(self.on_pushButton_3_clicked) 
  def retranslateUi(self, Form):
    Form.setWindowTitle(_translate("Form", "Form", None))
    self.pushButton.setText(_translate("Form", "进入dialog1", None))
    self.pushButton_2.setText(_translate("Form", "进入dialog2", None))
    self.pushButton_3.setText(_translate("Form", "退出", None))
    self.label.setText(_translate("Form", "主窗体", None)) 
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