code: def get_samples(in_file):
      
      with utils.open_gzipsafe(in_file) as in_handle:
          for line in in_handle:
              if line.startswith("#CHROM"):
                  parts = line.strip().split("\t")
                  return parts[9:]
      raise ValueError("Did not find sample header in VCF file %s" % in_file)
docs: Retrieve samples present in a VCF file