code: def select_sample(in_file, sample, out_file, config, filters=None):
      
      if not utils.file_exists(out_file):
          with file_transaction(config, out_file) as tx_out_file:
              if len(get_samples(in_file)) == 1:
                  shutil.copy(in_file, tx_out_file)
              else:
                  if in_file.endswith(".gz"):
                      bgzip_and_index(in_file, config)
                  bcftools = config_utils.get_program("bcftools", config)
                  output_type = "z" if out_file.endswith(".gz") else "v"
                  filter_str = "-f %s" % filters if filters is not None else ""  # filters could be e.g. 'PASS,.'
                  cmd = "{bcftools} view -O {output_type} {filter_str} {in_file} -s {sample} > {tx_out_file}"
                  do.run(cmd.format(**locals()), "Select sample: %s" % sample)
      if out_file.endswith(".gz"):
          bgzip_and_index(out_file, config)
      return out_file
docs: Select a single sample from the supplied multisample VCF file.