code: def with_organisation(self, organisation):
          
          if organisation is None:
              organisation = ''
          organisation = slugify(organisation)
          self._validate_organisation(organisation)
          self.organisation = organisation
          return self
docs: Add an organisation segment.
  
          Args:
              organisation (str): Official name of an administrative body
                  holding an election.
  
          Returns:
              IdBuilder
  
          Raises:
              ValueError