human
Solve the following python programming problem given the following code:
def http_digest(r, username, password) : 
    'Attaches HTTP Digest Authentication to the given Request object.
    Arguments should be considered non-positional.
    ' 
    def handle_401(r) : 
        'Takes the given response and tries digest-auth, if needed.' 
        s_auth = r.headers.get ('www-authenticate', '') 
        if ('digest' in s_auth.lower ()) : 
            last_nonce = '' 
            nonce_count = 0 
            chal = parse_dict_header (s_auth.replace ('Digest ', '')) 
            realm = chal ['realm'] 
            nonce = chal ['nonce'] 
            qop = chal.get ('qop') 
            algorithm = chal.get ('algorithm', 'MD5') 
            opaque = chal.get ('opaque', None) 
            algorithm = algorithm.upper () 
            if (algorithm == 'MD5') : 
                H = (lambda x : hashlib.md5 (x).hexdigest ()) 
else : 
                if (algorithm == 'SHA') : 
                    H = (lambda x : hashlib.sha1 (x).hexdigest ()) 
KD = (lambda s, d : H (('%s:%s' % (s, d)))) 
            if (H is None) : 
                return None 
entdig = None 
            p_parsed = urlparse (r.request.url) 
            path = (p_parsed.path + p_parsed.query) 
            A1 = ('%s:%s:%s' % (username, realm, password)) 
            A2 = ('%s:%s' % (r.request.method, path)) 
            if (qop == 'auth') : 
                if (nonce == last_nonce) : 
                    nonce_count += 1 
else : 
                    nonce_count = 1 
                    last_nonce = nonce 
ncvalue = ('%08x' % nonce_count) 
                cnonce = hashlib.sha1 (('%s:%s:%s:%s' % (nonce_count, nonce, time.ctime (), randombytes (8)))).hexdigest () [: 16] 
                noncebit = ('%s:%s:%s:%s:%s' % (nonce, ncvalue, cnonce, qop, H (A2))) 
                respdig = KD (H (A1), noncebit) 
else : 
                if (qop is None) : 
                    respdig = KD (H (A1), ('%s:%s' % (nonce, H (A2)))) 
else : 
                    return None 
base = ('username="%s", realm="%s", nonce="%s", uri="%s", response="%s"' %...

    
    

    Fix the buggy line: r.hooks ['response'] = username
assistant
#Here is Python code to fix the buggy line: r.

r.hooks ['response'] = def handle_401(