bitcoincore help parser

import argparse
import json
import subprocess
from collections import defaultdict


def _execute(*args) -> str:
    p = subprocess.Popen(args, stdout=subprocess.PIPE)
    res, _ = p.communicate()
    return res.decode('utf8')


def get_command_help(cli: str, cmd: str) -> str:
    return _execute(cli, 'help', cmd)


def get_help(cli: str) -> str:
    return _execute(cli, 'help')


def main(cli: str, blockchain_name: str, version: str):
    main_help = get_help(cli)

    result = {blockchain_name: {version: defaultdict(lambda: dict())}}

    cmd_group = None
    for line in main_help.split('\n'):
        if not line:
            continue

        # define group
        if '==' in line:
            cmd_group = line.replace('=', '').strip()
            continue

        # define command
        cmd = line.split(' ')[0].strip()
        result[blockchain_name][version][cmd_group][cmd] = get_command_help(cli, cmd)

    # save result
    json.dump(result, open(f'{cli}-{version}.json', 'w'))


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('blockchain_cli', type=str, help='blockchain cli')
    parser.add_argument('blockchain', type=str, help='blockchain name')
    parser.add_argument('version', type=str, help='version')

    args = parser.parse_args()

    main(args.blockchain_cli, args.blockchain, args.version)