code: def copy_value(self, orig_key, new_key):
          
          data = self.model.get_data()
          if isinstance(data, list):
              data.append(data[orig_key])
          if isinstance(data, set):
              data.add(data[orig_key])
          else:
              data[new_key] = data[orig_key]
          self.set_data(data)
docs: Copy value