def get_nonce_key(server_url, timestamp, salt):
 return '{prefix}{url}.{ts}.{salt}'.format(prefix=NONCE_KEY_PREFIX, url=server_url, ts=timestamp, salt=salt)

def get_nonce_key ( server_url , timestamp , salt ) : return '{prefix}{url}.{ts}.{salt}' . format ( prefix = NONCE_KEY_PREFIX , url = server_url , ts = timestamp , salt = salt )
returns the nonce for the given parameters .