human
I wrote the below code

    import argparse
    import sys
    parser = argparse.ArgumentParser(description='Prepare    SGF    Go    game    files    for    training    the    neural    network    model.', epilog='Available    features    are:    board,    ones,    turns_since,    liberties,                                capture_size,    self_atari_size,    liberties_after,    sensibleness,    and    zeros.                                Ladder    features    are    not    currently    implemented')
    parser.add_argument('--features', '-f', help="Comma-separated    list    of    features    to    compute    and    store    or    'all'", default='all')
    parser.add_argument('--outfile', '-o', help='Destination    to    write    data    (hdf5    file)', required=True)
    parser.add_argument('--recurse', '-R', help='Set    to    recurse    through    directories    searching    for    SGF    files', default=False, action='store_true')
    parser.add_argument('--directory', '-d', help='Directory    containing    SGF    files    to    process.    if    not    present,    expects    files    from    stdin', default=None)
    parser.add_argument('--size', '-s', help='Size    of    the    game    board.    SGFs    not    matching    this    are    discarded    with    a    warning', type=int, default=19)
    parser.add_argument('--verbose', '-v', help='Turn    on    verbose    mode', default=False, action='store_true')
    if (cmd_line_args is None):
        args = parser.parse_args()
    else:
        args = parser.parse_args(cmd_line_args)
    if (args.features.lower() == 'all'):
        feature_list = ['board', 'ones', 'turns_since', 'liberties', 'capture_size', 'self_atari_size', 'liberties_after', 'ladder_capture', 'ladder_escape', 'sensibleness', 'zeros']
    else:
        feature_list = args.features.split(',')
    if args.verbose:
        print ('using    features', feature_list)
    converter = GameConverter(feature_list)
    def _is_sgf(fname):
        return (fname.strip()[(-4):] == '.sgf')
    def _walk_all_sgfs(root):
   ...

What's a good function header?
 Write me a Python program to print ('using    features', feature_list)?
assistant
#Here is Python program to print ('using    features', feature_list)
.

def run_game_converter(cmd_line_args=None):