No one is import * from util/stem, so remove __all__

stream_building_lock = RLock()

__all__ = [

    'add_event_listener',

    'remove_event_listener',

    'attach_stream_to_circuit_listener',

    'init_controller',

    'init_controller_with_config',

    'is_controller_okay',

    'fp_or_nick_to_relay',

    'only_relays_with_bandwidth',

    'circuit_str',

]

def fp_or_nick_to_relay(controller, fp_nick):

    ''' Takes a string that could be either a relay's fingerprint or nickname.

    Return the relay's descriptor if found. Otherwise return None.