code: def _num_values(self):
          
          # Add min_values to string
          num_values = str(self.min_values) if self.min_values else "0"
  
          # Handle infinite max_values or finite max_values
          if self.max_values is None or self.max_values == float("inf"):
              num_values += "+"
          else:
              num_values += ".." + str(self.max_values)
  
          # Return the num_values string
          return num_values
docs: Generate a valid num_values string based off min_values and max_values
          :return: string