code: def get_gaf_format(self):
          
          sep = '\t'
          return sep.join(
              [self.gene, self.db_ref, self.term.id, self.evidence,
               '|'.join(self.db_ref), '|'.join(self.with_)])
docs: Return a GAF 2.0-compatible string representation of the annotation.
  
          Parameters
          ----------
  
          Returns
          -------
          str
              The formatted string.