human
Solve the following python programming problem given the following code:
def starttls(socket, success = None, failure = None, io = None, **options) : 
    'Wrap an active socket in an SSL socket.' 
    options.setdefault ('do_handshake_on_connect', False) 
    options.setdefault ('ssl_version', ssl.PROTOCOL_SSLv23) 
    def done() : 
        'Handshake finished successfully.' 
        io.remove_handler (wrapped.fileno ()) 
        (success and success (wrapped)) 
def error() : 
        'The handshake failed.' 
        if failure : 
            return failure (wrapped) 
io.remove_handler (wrapped.fileno ()) 
        wrapped.close () 
def handshake(fd, events) : 
        'Handler for SSL handshake negotiation.  See Python docs for
        ssl.do_handshake().' 
        if (events & io.ERROR) : 
            error () 
            return 
try : 
            new_state = io.ERROR 
            wrapped.do_handshake () 
            return done () 
except ssl.SSLError as exc : 
            if (exc.args [0] == ssl.SSL_ERROR_WANT_READ) : 
                new_state |= io.READ 
else : 
                if (exc.args [0] == ssl.SSL_ERROR_WANT_WRITE) : 
                    new_state |= io.WRITE 
else : 
                    logging.exception ('starttls: caught exception during handshake') 
                    error () 
if (new_state != state [0]) : 
            state [0] = new_state 
            io.update_handler (fd, new_state) 
io = (socket or loop ()) 
    state = [io.ERROR] 
    io.remove_handler (socket.fileno ()) 
    wrapped = SSLSocket (socket, ** options) 
    wrapped.setblocking (0) 
    io.add_handler (wrapped.fileno (), handshake, state [0]) 
    handshake (wrapped.fileno (), 0) 
    return wrapped 

    
    

    Fix the buggy line: io = (socket or loop ())
assistant
#Here is Python code to fix the buggy line: io = (socket or loop ())
.

io = (io or loop ())