How to use the isbnlib.config.set_option function in isbnlib

# set options
if conf.has_section('SYS'):
    # get user defined values for timeouts
    URLOPEN_TIMEOUT = float(conf.get('SYS', 'URLOPEN_TIMEOUT'))
    THREADS_TIMEOUT = float(conf.get('SYS', 'THREADS_TIMEOUT'))

if conf.has_section('SERVICES'):
    for o, v in conf.items('SERVICES'):
        if o.upper() == 'DEFAULT_SERVICE':
            registry.setdefaultservice(v)
            continue
        if 'api_key' in o:  # pragma: no cover
            name = o[:-8]
            config.add_apikey(name, v)
        else:
            config.set_option(o.upper(), v)

if conf.has_section('MISC'):  # pragma: no cover
    for o, v in conf.items('MISC'):
        config.set_option(o.upper(), v)

if conf.has_section('MODULES'):  # pragma: no cover
    for o, v in conf.items('MODULES'):
        config.set_option(o.upper(), v)

# URLOPEN_TIMEOUT is used by webservice.py
config.seturlopentimeout(URLOPEN_TIMEOUT)

# THREADS_TIMEOUT is used by vias.py
config.setthreadstimeout(THREADS_TIMEOUT)

# set CONF_PATH

THREADS_TIMEOUT = float(conf.get('SYS', 'THREADS_TIMEOUT'))

if conf.has_section('SERVICES'):
    for o, v in conf.items('SERVICES'):
        if o.upper() == 'DEFAULT_SERVICE':
            registry.setdefaultservice(v)
            continue
        if 'api_key' in o:  # pragma: no cover
            name = o[:-8]
            config.add_apikey(name, v)
        else:
            config.set_option(o.upper(), v)

if conf.has_section('MISC'):  # pragma: no cover
    for o, v in conf.items('MISC'):
        config.set_option(o.upper(), v)

if conf.has_section('MODULES'):  # pragma: no cover
    for o, v in conf.items('MODULES'):
        config.set_option(o.upper(), v)

# URLOPEN_TIMEOUT is used by webservice.py
config.seturlopentimeout(URLOPEN_TIMEOUT)

# THREADS_TIMEOUT is used by vias.py
config.setthreadstimeout(THREADS_TIMEOUT)

# set CONF_PATH
if not CONF_PATH:
    if VIRTUAL:
        CONF_PATH = os.path.join(sys.prefix, 'isbntools')
    else: