def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.ui = Ui_MainWindow() #框主题名称
self.ui.setupUi(self)
QtCore.QObject.connect(self.ui.lineEdit,
QtCore.SIGNAL('returnPressed()'), self.Go)
QtCore.QObject.connect(self.ui.pushButton, QtCore.SIGNAL("clicked()"),
self.Go)
QtCore.QObject.connect(self.ui.comboBox,
QtCore.SIGNAL("currentIndexChanged(int)"),
self.mode)
QtCore.QObject.connect(self.ui.pushButton_2,
QtCore.SIGNAL("clicked()"), self.file_dialog)
