code: def get_pos(vcf_line):
          
          if not vcf_line:
              return None
          vcf_data = vcf_line.strip().split('\t')
          return_data = dict()
          return_data['chrom'] = CHROM_INDEX[vcf_data[0]]
          return_data['pos'] = int(vcf_data[1])
          return return_data
docs: Very lightweight parsing of a vcf line to get position.
  
          Returns a dict containing:
          'chrom': index of chromosome (int), indicates sort order
          'pos': position on chromosome (int)