Python-сообщество

class mainWindowClass(QWidget, form_ui.Ui_Form):
    def __init__(self):
        super(mainWindowClass, self).__init__()
        self.setupUi(self)
        self.count = 1
        self.start_btn.clicked.connect(self.addtext)
    def addtext(self):
        text = 'Text nomer %s' %(self.count)
        self.items_lw.addItem(text)
        self.items_lw.scrollToBottom()
        self.count += 1
        self.timerstart()
    def timerstart(self):
        t = threading.Timer(0.5, self.addtext)
        t.start()