Error while using tspy package

[skantbksc]

D = [[ 0, 60, 66, 258, 256, 682, 770, 888],
[ 60, 0, 50, 225, 213, 630, 719, 832],
[ 66, 50, 0, 275, 260, 618, 707, 829],
[258, 225, 275, 0, 52, 689, 772, 840],
[256, 213, 260, 52, 0, 637, 719, 789],
[682, 630, 618, 689, 637, 0, 88, 245],
[770, 719, 707, 772, 719, 88, 0, 181],
[888, 832, 829, 840, 789, 245, 181, 0]]

from tspy import TSP
tsp = TSP()

tsp.read_mat(D)

from tspy.solvers import TwoOpt_solver
two_opt = TwoOpt_solver(initial_tour='NN', iter_num=100)
two_opt_tour = tsp.get_approx_solution(two_opt)

The code does not exceute and gives the following error:
TypeError: list indices must be integers or slices, not tuple

[wborgeaud]

The problem is that read_mat takes a numpy matrix as argument (this is mentioned in the docs).
If you replace the first line by

import numpy as np
D = np.array([[...],...,[...]], np.float64)

the code runs as expected.