Hello, I'm making Python mini-projects and now I'm making a Latin Square (Latin Square: http://en.wikipedia.org/wiki/Latin_square)
So, I started watching example code and I found this question on Stackoverflow: http://stackoverflow.com/questions/5313900/generating-cyclic-permutations-reduced-latin-squares-in-python It uses a list comprenhension to generate the Latin Square, I'm am a newbie to Python, and I've tried to figure out how this is evaluated: a = [1, 2, 3, 4] n = len(a) [[a[i - j] for i in range(n)] for j in range(n)] I don't understand how the "i" and the "j" changes. On my way of thought it is evaluated like this: [[a[0 - 0] for 0 in range(4)] for 0 in range(4)] [[a[1 - 1] for 1 in range(4)] for 1 in range(4)] [[a[2 - 2] for 2 in range(4)] for 2 in range(4)] [[a[3 - 3] for 3 in range(4)] for 3 in range(4)] But I think I'm wrong... So, could you explain me as above? It would help me a lot. Thanks for reading! -- https://mail.python.org/mailman/listinfo/python-list