code: def select(self, *attributes):
          
          if attributes:
              for attribute in attributes:
                  attribute = self.protocol.convert_case(
                      attribute) if attribute and isinstance(attribute,
                                                             str) else None
                  if attribute:
                      if '/' in attribute:
                          # only parent attribute can be selected
                          attribute = attribute.split('/')[0]
                      self._selects.add(attribute)
          else:
              if self._attribute:
                  self._selects.add(self._attribute)
  
          return self
docs: Adds the attribute to the $select parameter
  
          :param str attributes: the attributes tuple to select.
           If empty, the on_attribute previously set is added.
          :rtype: Query