code: def count_uniquelymapping_reads(self, file_name, paired_end):
          
          param = " -c -F256"
          if file_name.endswith("sam"):
              param += " -S"
          return self.samtools_view(file_name, param=param)
docs: Counts the number of reads that mapped to a unique position.
  
          :param str file_name: name of reads file
          :param bool paired_end: This parameter is ignored.