Question

How to convert a 2D list to a 1D list in Python

Answer 1

def list2d_to_1d(list2d):
    lst = []
    
    for i in range(len(list2d)):
        for j in range(len(list2d[i])):
            lst.append(list2d[i][j])
    
    return lst

list2d = [
        [5, 6, 1],
        [3, 8, 0],
        [9, 2, 7]
    ]

lst = list2d_to_1d(list2d)

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



'''
run:

5	6	1	3	8	0	9	2	7

'''

 

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Answer 2

import itertools
 
list2d = [
        [5, 6, 1],
        [3, 8, 0],
        [9, 2, 7]
    ]
 
lst = list(itertools.chain.from_iterable(list2d))

for n in lst:
    print(n, end="\t")
 
 
 
'''
run:
 
5	6	1	3	8	0	9	2	7
 
'''

 

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