code: def setCheckedItems(self, items):
          
          if not self.isCheckable():
              return
          
          model = self.model()
          for i in range(self.count()):
              item_text = self.itemText(i)
              if not item_text:
                  continue
              
              if nativestring(item_text) in items:
                  state = Qt.Checked
              else:
                  state = Qt.Unchecked
              
              model.item(i).setCheckState(state)
docs: Returns the checked items for this combobox.
          
          :return     items | [<str>, ..]