Python-сообщество

#!/usr/bin/python
# coding: utf-8
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *

class MainWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.resize(200,200)
        self.createActions()
        self.createMenus()
    def item1(self):
        print "Minimize"
    def item2(self):
        print "Bring All to Front"
    def item3(self):
        print "Form-untitled"
    def createActions(self):
        self.item1Act = QAction(self.tr("Minimize" ), self)
        self.item1Act.setShortcut(self.tr("Ctrl+M"))
        self.item1Act.setCheckable(True)
        self.item1Act.setChecked(True)
        self.connect(self.item1Act,SIGNAL("triggered()"), self.item1)

        self.item2Act = QAction(self.tr("Bring All to Front"), self)

        self.item3Act = QAction(self.tr("Form-untitled"), self)
        self.item3Act.setCheckable(True)
        self.connect(self.item2Act, SIGNAL("triggered()"), self.item2)

####### вот тут происходит переключение в RadioButton #######
        self.group = QActionGroup(self)
        self.group.addAction(self.item3Act)
        self.item3Act.setChecked(True)
#############################################################
        self.exitAct = QAction(self.tr("exit"), self)
        self.connect(self.exitAct, SIGNAL("triggered()"), self.close)

    def createMenus(self):
        self.fileMenu = self.menuBar().addMenu(self.tr("MyMenu"))
        self.fileMenu.addAction(self.item1Act)
        self.fileMenu.addAction(self.item2Act)
        self.fileMenu.addAction(self.item3Act)
        self.fileMenu.addAction(self.exitAct)

app = QApplication(sys.argv)
widget = MainWindow()
widget.show()
sys.exit(app.exec_())