code: def setCheckedIndexes(self, indexes):
          
          if not self.isCheckable():
              return
          
          model = self.model()
          model.blockSignals(True)
          for i in range(self.count()):
              if not self.itemText(i):
                  continue
              
              item = model.item(i)
              
              if i in indexes:
                  state = Qt.Checked
              else:
                  state = Qt.Unchecked
                  
              item.setCheckState(state)
          model.blockSignals(False)
          self.updateCheckedText()
docs: Sets a list of checked indexes for this combobox.
          
          :param      indexes | [<int>, ..]