Question

How to remove all the occurrences of an element in a nested list with Python

Answer 1

nestedlist = [[1, 2, 3], [1, 5], [6, 1, 8, 9, 10], [9, 27, 1, 85], [1]]

for sub_list in nestedlist:
    for element in sub_list:
        if element == 1:
            sub_list.remove(1)
            
print(nestedlist)


'''
run:

[[2, 3], [5], [6, 8, 9, 10], [9, 27, 85], []]

'''

 

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Answer 2

nestedlist = [[1, 2, 3], [1, 5], [6, 1, 8, 9, 10], [9, 27, 1, 85], [1]]
 
nestedlist = [[elem for elem in sub_list if elem != 1] for sub_list in nestedlist]            
             
print(nestedlist)
 
 
'''
run:
 
[[2, 3], [5], [6, 8, 9, 10], [9, 27, 85], []]
 
'''

 

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