code: def coverageInfo(self):
          result = defaultdict(list)
          for titleAlignment in self:
              for hsp in titleAlignment.hsps:
                  score = hsp.score.score
                  for (subjectOffset, base, _) in titleAlignment.read.walkHSP(
                          hsp, includeWhiskers=False):
                      result[subjectOffset].append((score, base))
          return result