code: def trim(self, start, end):
          '''Removes first 'start'/'end' bases off the start/end of the sequence'''
          super().trim(start, end)
          self.qual = self.qual[start:len(self.qual) - endf trim(self, start, end):
          '''Removes first 'start'/'end' bases off the start/end of the sequence'''
          super().trim(start, end)
          self.qual = self.qual[start:len(self.qual) - end]
docs: Removes first 'start'/'end' bases off the start/end of the sequence