Threads y GUI

[Radix00]

ESTE ES EL CODIGO
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#Dialogo de la ventana principal
from dialogs.dlgPrincipal import dlgPrincipal
import sys, signal, time,threading

#Librerias necesarias
from PyQt4 import QtCore, QtGui

class programa:
    def __init__(self):
        ################################################
        #           CARGA DE LA APLICACION             #
        ################################################
        self.app = QtGui.QApplication(sys.argv)
        self.MainWindow = QtGui.QMainWindow()
        dlgPrincipal(self)

        ################################################
        #            SE CIERRA EL PROGRAMA                          #
        #         AL CERARSE LA ULTIMA VENTANA                #
        ################################################
        self.app.connect(self.app, QtCore.SIGNAL('lastWindowClosed()'),
self.app, QtCore.SLOT('quit()'))
        self.tarea=threading.Thread(target=self.prueba,name='Prueba')
        self.tarea.start()
        ################################################
        #              MUESTRA LA VENTANA              #
        ################################################
        self.MainWindow.show()
        sys.exit(self.app.exec_())

    def prueba(self):
        for i in range(3):
            self.ui.textBrowser.append('Hola'+str(i))
            self.ui.textBrowser.reload()
            print 'Hola'+str(i)
            time.sleep(5)
#Arranca el programa
if __name__=='__main__':
    pro = programa()
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ESTOS LOS ERRORES
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QObject::connect: Cannot queue arguments of type 'QTextCursor'
QObject::startTimer: timers cannot be started from another thread
QObject::connect: Cannot queue arguments of type 'QSizeF'
QObject::connect: Cannot queue arguments of type 'QRectF'
QObject::startTimer: timers cannot be started from another thread