#!/usr/bin/python

from PyQt4 import QtGui, QtCore

import sys, time

class CustomWidget(QtGui.QWidget):

    def __init__(self):
        super(CustomWidget, self).__init__()


    def start(self):
        for i in range(0, 10000):
            print "hello %d" % i

    def showEvent(self, showEvent):
        #print showEvent
        self.start()

app = QtGui.QApplication(sys.argv)

w1 = CustomWidget()
w1.show()

sys.exit(app.exec_())