import numpy as np
arr = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12])
newarr = arr.reshape(2, 3, 2)
print(newarr)
[[[ 1 2] [ 3 4] [ 5 6]] [[ 7 8] [ 9 10] [11 12]]]