Problem is you are trying to send a array that is a python list. At first you need to convert it into nampy array.
import numpy as np
py_list = [439, 301, 481, 194, 208, 415, 147, 502, 333, 86, 544, 353, 229]
convert_numpy = np.array(py_list )
sent = sent[np.convert_numpy,:]
and for 1st line [439 301 481 194 208 415 147 502 333 86 544 353 229]
you need to add comma to separate the value.
solved Python Lists and tuples