Question

How to declare 3D list in Python

Answer 1

n = 3

lst3d = [[[0 for k in range(n)] for j in range(n)] for i in range(n)]

print(lst3d)

 
      
  
'''
run:
  
[[[0, 0, 0], [0, 0, 0], [0, 0, 0]], [[0, 0, 0], [0, 0, 0], [0, 0, 0]], [[0, 0, 0], [0, 0, 0], [0, 0, 0]]]

'''

 

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Answer 2

n = 3

lst3d = [[[0] * n] * n] * n

print(lst3d)

 
      
  
'''
run:
  
[[[0, 0, 0], [0, 0, 0], [0, 0, 0]], [[0, 0, 0], [0, 0, 0], [0, 0, 0]], [[0, 0, 0], [0, 0, 0], [0, 0, 0]]]

'''

 

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Answer 3

import numpy as np

i = 3
j = 3
k = 3

lst3d = np.zeros((i, j, k))

print(lst3d)


      
  
'''
run:
  
[[[0. 0. 0.]
  [0. 0. 0.]
  [0. 0. 0.]]

 [[0. 0. 0.]
  [0. 0. 0.]
  [0. 0. 0.]]

 [[0. 0. 0.]
  [0. 0. 0.]
  [0. 0. 0.]]]

'''

 

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