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

class MainTab(QtGui.QTabWidget):
    def focusInEvent (self, ev):
        print "MainTab focus event"
        QtGui.QTabWidget.focusInEvent(self, ev)
    
    def init(self):
        self.connect(self, QtCore.SIGNAL("currentChanged (int)"), self.currentChanged_slot)
    
    def  currentChanged_slot(self, i):
        print "MainTab currentChanged_slot ", i 
        self.currentWidget().setFocus()
    
    
    
class SecondTab(QtGui.QTabWidget):
    def focusInEvent(self, ev):
        print "SecondTab focus event"
        QtGui.QTabWidget.focusInEvent(self, ev)
    
    
    
app =  QtGui.QApplication(sys.argv)
MWin = QtGui.QMenuBar()
tab = MainTab(MWin)
tab.init()
tab0 = SecondTab()
tab1 = SecondTab()
wdg0 = QtGui.QWidget()
wdg1 = QtGui.QWidget()
tab0.addTab(wdg0, '1')
tab1.addTab(wdg1, '2')
tab.addTab(tab0, 'one')
tab.addTab(tab1, 'two')

MWin.resize(790, 590)
MWin.show()
sys.exit(app.exec_())