Python-сообщество

def count(interval):
    global number
    number = 0
    
    while True:
        number += 1        
        sleep(interval)


t = Thread(target = count, args = (5,))
t.daemon = True
t.start()


class MyClass(QtGui.QWidget):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)

        self.setWindowTitle('Test')

        label = QtGui.QLabel(str(number), self)
        label.move(15, 10)

        self.resize(250, 30)


app = QtGui.QApplication(sys.argv)
qb = MyClass()
qb.show()
sys.exit(app.exec_())

label = QtGui.QLabel(str(number), self)