code: def _set_section(self, section):
          
  
          if self.section != section:
              if self.section > section:
                  raise dns.exception.FormError
              self.section = section
docs: Set the renderer's current section.
  
          Sections must be rendered order: QUESTION, ANSWER, AUTHORITY,
          ADDITIONAL.  Sections may be empty.
  
          @param section: the section
          @type section: int
          @raises dns.exception.FormError: an attempt was made to set
          a section value less than the current section.