The imports:

import difflib
import io
import os
from pathlib import Path
import re
import shutil
import sys

sys.path.append(str(Path(__file__).resolve().parent.parent))
from asciidoc import asciidoc  # noqa: E402

Some random ranges:

def iif(condition, iftrue, iffalse=None):
    """
    Immediate if c.f. ternary ?: operator.
    False value defaults to '' if the true value is a string.
    False value defaults to 0 if the true value is a number.
    """
    if iffalse is None:
        if isinstance(iftrue, str):
            iffalse = ''
        if type(iftrue) in (int, float):
            iffalse = 0
    if condition:
        return iftrue
    else:
        return iffalse

def normalize_data(lines):
    """
    Strip comments and trailing blank strings from lines.
    """
    result = [s for s in lines if not s.startswith('#')]
    strip_end(result)
    return result

class AsciiDocTest(object):

if __name__ == '__main__':
    # guarantee a stable timestamp matching the test fixtures
    os.environ['SOURCE_DATE_EPOCH'] = '1038184662'
    # Process command line options.
    from argparse import ArgumentParser
    parser = ArgumentParser(
        description='Run AsciiDoc conformance tests specified in configuration'
        'FILE.'
    )
    msg = 'Use configuration file CONF_FILE (default configuration file is '\
        'testasciidoc.conf in testasciidoc.py directory)'
    parser.add_argument(
        '-v',
        '--version',
        action='version',
        version='%(prog)s {}'.format(__version__)
    )
    parser.add_argument('-f', '--conf-file', help=msg)

    subparsers = parser.add_subparsers(metavar='command', dest='command')
    subparsers.required = True

    subparsers.add_parser('list', help='List tests')

    options = ArgumentParser(add_help=False)
    options.add_argument('-n', '--number', type=int, help='Test number to run')
    options.add_argument('-b', '--backend', type=str, help='Backend to run')

    subparsers.add_parser('run', help='Execute tests', parents=[options])

    subparser = subparsers.add_parser(
        'update',
        help='Regenerate and update test data',
        parents=[options]
    )
    subparser.add_argument(
        '--force',
        action='store_true',
        help='Update all test data overwriting existing data'
    )

    args = parser.parse_args()

    conffile = os.path.join(os.path.dirname(sys.argv[0]), 'testasciidoc.conf')
    force = 'force' in args and args.force is True
    if args.conf_file is not None:
        conffile = args.conf_file
    if not os.path.isfile(conffile):
        message('missing CONF_FILE: %s' % conffile)
        sys.exit(1)
    tests = AsciiDocTests(conffile)
    cmd = args.command
    number = None
    backend = None
    if 'number' in args:
        number = args.number
    if 'backend' in args:
        backend = args.backend
    if backend and backend not in BACKENDS:
        message('illegal BACKEND: {:s}'.format(backend))
        sys.exit(1)
    if number is not None and (number < 1 or number > len(tests.tests)):
        message('illegal test NUMBER: {:d}'.format(number))
        sys.exit(1)
    if cmd == 'run':
        tests.run(number, backend)
        if tests.failed:
            sys.exit(1)
    elif cmd == 'update':
        tests.update(number, backend, force=force)
    elif cmd == 'list':
        tests.list()

Using ; as separator:

def iif(condition, iftrue, iffalse=None):
    """
    Immediate if c.f. ternary ?: operator.
    False value defaults to '' if the true value is a string.
    False value defaults to 0 if the true value is a number.
    """
    if iffalse is None:
        if isinstance(iftrue, str):
            iffalse = ''
        if type(iftrue) in (int, float):
            iffalse = 0
    if condition:
        return iftrue
    else:
        return iffalse

def normalize_data(lines):
    """
    Strip comments and trailing blank strings from lines.
    """
    result = [s for s in lines if not s.startswith('#')]
    strip_end(result)
    return result