This code work perfectly

  def read_vcf(file_path):
        with open(file_path, 'r') as f:
            lines = [l for l in f if not l.startswith('##')]
        return pd.read_csv(
            io.StringIO(''.join(lines)),
            dtype={'#CHROM': str, 'POS': int, 'ID': str, 'REF': str, 'ALT': str,
               'QUAL': str, 'FILTER': str, 'INFO': str},
        sep='\t'
        ).rename(columns={'#CHROM': 'CHROM'})

However, after reading how to open gzip files I have found this

   def read_vcf(file_path):
        with io.TextIOWrapper(gzip.open(file_path, 'r')) as f:
            lines = [l for l in f if not l.startswith('##')]
        return pd.read_csv(
            io.StringIO(''.join(lines)),
            dtype={'#CHROM': str, 'POS': int, 'ID': str, 'REF': str, 'ALT': str,
               'QUAL': str, 'FILTER': str, 'INFO': str},
        sep='\t'
        ).rename(columns={'#CHROM': 'CHROM'})

io.TextIOWrapper is needed based on this post to avoid the error I got as in the post

But now I have got an error I don't understand

I have printed the results of the function and both results look the same

Why this error??