How can I create an empty 3d multidimensional array

Question

This code is my attempt at creating an empty 3d array.

n=3
board = [[[ 0 for _ in range(n)]
            for _ in range(n)]
            for _ in range(n)]
print(board)

So, what that creates is exactly what I'm looking for a 3d array with dimensions n by n by n, but the list is filled with 0's and if I take out the 0 an error occurs. How would I create this same list but empty?

What exactly is the format of sample output you are are looking for? My best guess is you want [[ [] for _ in range(n)] for _ in range(n)] — Moinuddin Quadri
– Moinuddin Quadri, Commented Dec 19, 2016 at 16:02
@JohnGordon: It wont't create new list, But nested lists with same references — Moinuddin Quadri
– Moinuddin Quadri, Commented Dec 19, 2016 at 16:08

Moinuddin Quadri · Accepted Answer · 2016-12-19 16:17:19Z

3

You need to use [] instead of 0 as:

n = 5
empty_list = [[[ [] for _ in range(n)] for _ in range(n)] for _ in range(n)]

Value hold by empty_list will be:

[[[[], [], [], [], []], 
  [[], [], [], [], []], 
  [[], [], [], [], []], 
  [[], [], [], [], []], 
  [[], [], [], [], []]], 
# Repeated 4 more times

For example:

>>> empty_list[0][0][0]  # Access element with nest level 3 in list
[]

edited Dec 19, 2016 at 16:17

answered Dec 19, 2016 at 16:04

Moinuddin Quadri

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6 Comments

Hamad Kashmiri Over a year ago

if i was to try and access empty_list[0][0][0] it would be out of range right. I am looking for something exactly as you have done above but where that index to the third degree is accessible

Hamad Kashmiri Over a year ago

I think in the above post you have created a 2d list with just extra brackets inside of it as oppose to a 3d list

Hamad Kashmiri Over a year ago

Is this not a 3d list with brackets inside of it?

Moinuddin Quadri Over a year ago

As per my definition of 3D; the solution I mentioned earlier was a 3D list. It is a 4D list. OR, in other words you may say 3D list with value as empty lists

Hamad Kashmiri Over a year ago

If i wanted to print this in the format shown above, where every 2d list has its own line, how would i do it?

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