Question

How to create a list of X elements that each element is a list of Y elements in Python

Answer 1

row = 3
col = 4

lst = [[0] * col for i in range(row)]

print(lst)

'''
run:

[[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]

'''

 

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Answer 2

row = 3
col = 4

lst = [[0] * col for i in range(row)]

lst[0][0] = 1
lst[1][1] = 2
lst[2][2] = 3

print(lst)

'''
run:

[[1, 0, 0, 0], [0, 2, 0, 0], [0, 0, 3, 0]]

'''

 

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Answer 3

row = 3
col = 4

lst = [[0] * col for i in range(row)]

lst[0][0] = 1
lst[1][1] = 2
lst[2][2] = 3

for row in lst:
    for col in row:
        print(col, end=" ")
    print(end="\n")

'''
run:

1 0 0 0 
0 2 0 0 
0 0 3 0 

'''

 

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