How to use the pdbpp.Color.set function in pdbpp

if pattern is None:
                pattern = ''
            if string is None:
                string = ''
        # Use "$" to mark end of line with trailing space
        if re.search(r'\s+$', string):
            string += '$'
        if re.search(r'\s+$', pattern):
            pattern += '$'
        pattern = pattern.replace("\t", "\\t")
        string = string.replace("\t", "\\t")
        print(pattern.ljust(maxlen+1), '| ', string, end='')
        if ok:
            print()
        else:
            print(pdbpp.Color.set(pdbpp.Color.red, '    <<<<<'))
            all_ok = False
    assert all_ok