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))        def on_pushButton_clicked(self):     self.form.hide()     Form1 = QtGui.QDialog()     ui = Dialog1()     ui.setupUi(Form1)     Form1.show()     Form1.exec_()     self.form.show()    def on_pushButton_3_clicked(self, Form):     #QtCore.QObject.connect( self.pushButton_3, QtCore.SIGNAL("clicked()"), self, QtCore.SLOT(quit()))     #也可以这样     self.form.close()        def on_pushButton_2_clicked(self):     self.form.close()     Form1 = QtGui.QDialog()     ui = Dialog2()     ui.setupUi(Form1)     Form1.show()     Form1.exec_()     self.form.show()  if __name__ == '__main__':   app = QtGui.QApplication(sys.argv)   Form = QtGui.QWidget()   window = MainWindow()    window.setupUi(Form)   Form.show()     sys.exit(app.exec_())       pass