I have a 2D list that functions very similarly to a 2D Numpy array. I need to rotate this by 90°, and usually I would just use np.rot90. However, since this is for a class, my teacher won't let us use the Numpy library for some reason. I want to define rot90 within my code so that I can use it without needing Numpy. How might I go about doing this? Continue reading...
