matrix rotation (layer wise) anti clockwise by 90 degrees

mat_layer_rot.py

a= [
    [1,2,3,4],
    [5,6,7,8],
    [9,10,11,12],
    [13,14,15,16]
    ]
for _ in a:
    print(*_)
print()
ab= [x[::-1] for x in zip(*a)] 
ba= list(reversed([list(reversed(x)) for x in ab]))
for _ in ba:
    print(*_)