np save function

1np.save('data.npy', num_arr) # save
2new_num_arr = np.load('data.npy') # load

1np.save('test3.npy', a)    # .npy extension is added if not given
2d = np.load('test3.npy')
3a == d
4# array([ True,  True,  True,  True], dtype=bool)