code: def _get_formatted_val(self, obj, attribute, column):
          
          attr_path = attribute.split('.')
          val = None
          tmp_val = obj
          for attr in attr_path:
              tmp_val = getattr(tmp_val, attr, None)
              if tmp_val is None:
                  break
          if tmp_val is not None:
              val = tmp_val
  
          value = format_value(column, val, self.config_key)
          return format_py3o_val(value)
docs: Return the formatted value of the attribute "attribute" of the obj "obj"
          regarding the column's description
  
          :param obj obj: The instance we manage
          :param str attribute: The string defining the path to access the end
          attribute we want to manage
          :param dict column: The column description dictionnary
          :returns: The associated value