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Python | Remove the given item from the list of lists

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Method # 1: Using List Comprehension

The logic behind this method is to reduce the size of the code and get the task done, using loops as a way of comprehending a list.

# Python3 demo code
# Removing an item from the list of lists
# using comprehension list

 
# initialization list

test_list = [[ 4 , 5 , 6 ], [ 5 , 6  , 4 , 1 ], [ 4 ], [ 4 , 8 , 9 , 10 ]]

 
# print original list

print ( "The original list:" + str (test_list))

 
# initialize the number to delete

N = 4

  
# using the comprehension list
# Removing an item from the list of lists

res = [[ele for ele in sub if ele! = N] for sub in test_list]

 
# print result

print ( "The list after deletion of element:" + str (res))

Output:

 The original list: [ [4, 5, 6], [5, 6, 4, 1], [4], [4, 8, 9, 10]] The list after deletion of element: [[5, 6], [5, 6 , 1], [], [8, 9, 10]] 

Method 2: Using List Comprehension + List Slicing
In this method we we usually perform a task similar to the method described above. The difference is that we use list slicing for better readability.

# Python3 demo code
# Remove an item from the list of lists
# use list comprehension + list slicing

  
# init list

test_list = [[ 4 , 5 , 6 ], [ 5 , 6 , 4 , 1 ], [ 4 ], [ 4 , 8 , 9 , 10 ]]

 
# print original list

print ( "The original list:" + str (test_list))

 
# initialize the number to delete

N = 4

 
# using understanding list + list slicing # Remove an item from the list of lists

for sub in test_list:

sub [:] = [ele for ele in sub if ele! = N]

 
# print result

print ( " The list after deletion of element: " + str (test_list))

Exit :

 The original list: [[4, 5, 6], [5, 6, 4, 1], [4], [4, 8, 9, 10]] The list after deletion of element: [[5, 6], [5, 6, 1], [], [8, 9, 10]] 

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