How to use the nhentai.constant.PROXY function in nhentai

if not os.path.exists(constant.NHENTAI_HOME):
                os.mkdir(constant.NHENTAI_HOME)

            with open(constant.NHENTAI_LANGUAGE, 'w') as f:
                f.write(args.language)
        except Exception as e:
            logger.error('Cannot create NHENTAI_HOME: {}'.format(str(e)))
            exit(1)

        logger.info('Default language now is {}.'.format(args.language))
        exit(0)

    if os.path.exists(constant.NHENTAI_PROXY):
        with open(constant.NHENTAI_PROXY, 'r') as f:
            link = f.read()
            constant.PROXY = {'http': link, 'https': link}

    if args.proxy:
        try:
            if not os.path.exists(constant.NHENTAI_HOME):
                os.mkdir(constant.NHENTAI_HOME)

            proxy_url = urlparse(args.proxy)
            if proxy_url.scheme not in ('http', 'https'):
                logger.error('Invalid protocol \'{0}\' of proxy, ignored'.format(proxy_url.scheme))
            else:
                with open(constant.NHENTAI_PROXY, 'w') as f:
                    f.write(args.proxy)

        except Exception as e:
            logger.error('Cannot create NHENTAI_HOME: {}'.format(str(e)))
            exit(1)

if not os.path.exists(constant.NHENTAI_HOME):
                os.mkdir(constant.NHENTAI_HOME)

            with open(os.path.join(constant.NHENTAI_HOME, 'cookie'), 'w') as f:
                f.write(args.cookie)
        except Exception as e:
            logger.error('Cannot create NHENTAI_HOME: {}'.format(str(e)))
            exit(1)

        logger.info('Cookie saved.')
        exit(0)

    if os.path.exists(os.path.join(constant.NHENTAI_HOME, 'proxy')):
        with open(os.path.join(constant.NHENTAI_HOME, 'proxy'), 'r') as f:
            link = f.read()
            constant.PROXY = {'http': link, 'https': link}

    if args.proxy:
        try:
            if not os.path.exists(constant.NHENTAI_HOME):
                os.mkdir(constant.NHENTAI_HOME)

            proxy_url = urlparse(args.proxy)
            if proxy_url.scheme not in ('http', 'https'):
                logger.error('Invalid protocol \'{0}\' of proxy, ignored'.format(proxy_url.scheme))
            else:
                with open(os.path.join(constant.NHENTAI_HOME, 'proxy'), 'w') as f:
                    f.write(args.proxy)
        except Exception as e:
            logger.error('Cannot create NHENTAI_HOME: {}'.format(str(e)))
            exit(1)

def request(method, url, **kwargs):
    session = requests.Session()
    session.headers.update({
        'Referer': constant.LOGIN_URL,
        'User-Agent': 'nhentai command line client (https://github.com/RicterZ/nhentai)',
        'Cookie': constant.COOKIE
    })
    return getattr(session, method)(url, proxies=constant.PROXY, verify=False, **kwargs)

def main():
    banner()
    options = cmd_parser()
    logger.info('Using mirror: {0}'.format(BASE_URL))

    from nhentai.constant import PROXY
    # constant.PROXY will be changed after cmd_parser()
    if PROXY != {}:
        logger.info('Using proxy: {0}'.format(PROXY))

    # check your cookie
    check_cookie()

    index = 0
    doujinshis = []
    doujinshi_ids = []
    doujinshi_list = []

    if options.favorites:
        if not options.is_download:
            logger.warning('You do not specify --download option')

        doujinshis = favorites_parser(options.page_range)

def main():
    banner()
    options = cmd_parser()
    logger.info('Using mirror: {0}'.format(BASE_URL))

    from nhentai.constant import PROXY
    # constant.PROXY will be changed after cmd_parser()
    if PROXY != {}:
        logger.info('Using proxy: {0}'.format(PROXY))

    # check your cookie
    check_cookie()

    index = 0
    doujinshis = []
    doujinshi_ids = []
    doujinshi_list = []

    if options.favorites:
        if not options.is_download:
            logger.warning('You do not specify --download option')

        doujinshis = favorites_parser(options.page_range)

    elif options.tag: