code: def show_value(self, value):
          
          values = self.get_values()
          values = [x for x in values if x['label'] == value]
          if len(values) == 0:
              raise Exception("Unknown value")
          else:
              return values[0]
docs: Get a specific canned value
  
          :type value: str
          :param value: Canned value to show
  
          :rtype: dict
          :return: A dictionnary containing canned value description