code: def _get_all_unmapped_reads(self, fout):
          '''Writes all unmapped reads to fout'''
          sam_reader = pysam.Samfile(self.bam, "rb")
          for read in sam_reader.fetch(until_eof=True):
              if read.is_unmapped:
                  print(mapping.aligned_read_to_read(read, ignore_quality=not self.fastq_out), file=foutf _get_all_unmapped_reads(self, fout):
          '''Writes all unmapped reads to fout'''
          sam_reader = pysam.Samfile(self.bam, "rb")
          for read in sam_reader.fetch(until_eof=True):
              if read.is_unmapped:
                  print(mapping.aligned_read_to_read(read, ignore_quality=not self.fastq_out), file=fout)
docs: Writes all unmapped reads to fout