code: def short_description(self):
          
          if self.is_insertion:
              return "chr%s g.%d_%dins%s" % (
                  self.contig,
                  self.start,
                  self.start + 1,
                  self.alt)
          elif self.is_deletion:
              return "chr%s g.%d_%ddel%s" % (
                  self.contig,
                  self.start,
                  self.end,
                  self.ref)
          elif self.ref == self.alt:
              return "chr%s g.%d%s" % (self.contig, self.start, self.ref)
          else:
              # substitution
              return "chr%s g.%d%s>%s" % (
                  self.contig,
                  self.start,
                  self.ref,
                  self.alt)
docs: HGVS nomenclature for genomic variants
          More info: http://www.hgvs.org/mutnomen/