python - QListWidget: connect function when QListWidgetItem changed -

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i have qlistwidget qlistwidgetitems carry checkboxes .i want call function when either checkbox checked/unchecked or new qlistwidgetitem added.

to try call qabstractitemmodel of qlistwidget self.flist implement datachanged signal. program crashes on following line:

self.flist.model().datachanged.connect(self.plot_paths)

here relevant code. hope can me connect plot_paths function event of qlistwidgetitems changes. 

self.flist = qtgui.qlistwidget() self.file_list.addwidget(self.flist, 1, 0, 1, 3) self.flist.model().datachanged.connect(self.plot_paths)  def plot_paths(self, topleft, bottomright):      model = self.flist.model()     index in range(model.rowcount()):         item = self.flist.item(index)         if item.checkstate() == qtcore.qt.unchecked:             self.on_adjust()


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