Python's n*n matrix rotates 90 degrees clockwise

First design ideas, take 4*4 matrix as an example, it is not difficult to find in fact, if the following the same color row and column exchange, in fact, can achieve the goal

It is not difficult to find that the implementation has the following rules:

i = 0
j = A
i = 1
j = 2, 3
I= 2
j = 3

DATA[I][J] and Data[j][i] can be exchanged, but the exchange will think that there is a third variable to implement the way of exchange, so the implementation code is as follows:

You are not mistaken, so it has been done, is not very magical! If you want to implement N*n, modify the code can be, here I do not add.

　　　　

　　

Python's n*n matrix rotates 90 degrees clockwise