old_contents: import pandas
  
  
  def read_vcf(filename):
      """
      Reads an input VCF file containing lines for each SNP and columns with genotype info for each sample.
  
      :param filename: Path to VCF file
      :return: Pandas DataFrame representing VCF file with rows as SNPs and columns with info and samples
      """
      vcf = open(filename)
      for l in vcf:
          if not l.startswith('##'):
              header = l.strip().split('\t')
              break
      snps = pandas.read_table(vcf, names=header)
      return snps
new_contents: import pandas
  
  
  def read_vcf(filename):
      """
      Reads an input VCF file containing lines for each SNP and columns with genotype info for each sample.
  
      :param filename: Path to VCF file
      :return: Pandas DataFrame representing VCF file with columns as SNPs and rows with samples
      """
      vcf = open(filename)
      for l in vcf:
          if not l.startswith('##'):
              header = l.strip().split('\t')
              break
      snps = pandas.read_table(vcf, names=header)
      snps.index = snps.ID
      snps = snps.iloc[:,9:].T
      return snps
subject: Update VCF parsing to output SNP-column sample-row DataFrame