Python 2.7 creating a multidimensional list
list, list-comprehension, python, python-2.7
Solution
I think your list comprehension versions were very close to working. You don't need to do any list multiplication (which doesn't work with empty lists anyway). Here's a working version:
>>> y = [[[] for i in range(n)] for i in range(n)]
>>> print y
[[[], [], [], []], [[], [], [], []], [[], [], [], []], [[], [], [], []]]
Problem
In Python I want an intuitive way to create a 3 dimensional list. I want an (n by n) list. So for n = 4 it should be: ``` x = [[[],[],[],[]],[[],[],[],[]],[[],[],[],[]],[[],[],[],[]]] ``` I've tried using: ``` y = [n*[n*[]]] y = [[[]]* n for i in range(n)] ``` Which both appear to be creating copies of a reference. I've also tried naive application of the list builder with little success: ``` y = [[[]* n for i in range(n)]* n for i in range(n)] y = [[[]* n for i in range(1)]* n for i in range(n)] ``` I've also tried building up the array iteratively using loops, with no success. I also tried this: ``` y = [] for i in range(0,n): y.append([[]*n for i in range(n)]) ``` Is there an easier or more intuitive way of doing this?