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
docs: Return information about the bases found at each location in our title
          sequence.
  
          @return: A C{dict} whose keys are C{int} subject offsets and whose
              values are unsorted lists of (score, base) 2-tuples, giving all the
              bases from reads that matched the subject at subject location,
              along with the bit score of the matching read.