code: def populate_hazard_classification(self):
          
          new_class = {
              'value': self.radius_form.value(),
              'name': self.class_form.text()}
          self.classification.append(new_class)
          self.classification = sorted(
              self.classification, key=itemgetter('value'))
  
          self.hazard_class_form.clear()
          for item in self.classification:
              new_item = '{value} - {name}'.format(
                  value=item['value'], name=item['name'])
              self.hazard_class_form.addItem(new_item)
  
          self.radius_form.setValue(0)
          self.class_form.clear()
          self.ok_button_status()
docs: Populate hazard classification on hazard class form.