a = np.array([[[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]],
[[13, 14, 15, 16], [17, 18, 19, 20], [21, 22, 23, 24]],
[[25, 26, 27, 28], [29, 30, 31, 32], [33, 34, 35, 36]],
])
print(a.shape) # (3, 3, 4)
b=a[:,-1,:]
print(b.shape)