Q:

Python program to remove empty list from a list of lists

mahmoud2506
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2022-05-22
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List of lists is a list that contains lists as its elements.

We have a list that contains other lists (empty and non-empty). And we need to return a list that does not contain any empty string.

To perform this task, we need to iterate the list and then in the resultant list exclude all the empty elements.

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mahmoud2506
2022-05-22
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Program to remove the empty list from a list of lists

# Python program to remove empty list 
# from a list of lists

# Initializing list of lists
listofList = [[5], [54, 545,9], [], [1, 4, 7], [], [8, 2, 5] ]

# Printing original list
print("List of List = ", end = " ")
print(listofList)

nonEmptyList = [] 

# Iterating using loop and eliminating empty list
nonEmptyList = [listEle for listEle in listofList if listEle != []]

# Printing list without empty list
print("List without empty list: ", end = " " )
print(nonEmptyList)

Output:

List of List =  [[5], [54, 545, 9], [], [1, 4, 7], [], [8, 2, 5]]
List without empty list:  [[5], [54, 545, 9], [1, 4, 7], [8, 2, 5]]

Another method

Python provides its users with in-built functions on data structures to perform the task easily.

On such method is filter() method

Syntax:

filter(function, iterable)

Program to remove the empty list from a list of lists using filter() method

# Python Program to remove empty list from a list of lists

# Initializing list of lists
listofList = [[5], [54, 545,9], [], [1, 4, 7], [], [8, 2, 5] ]

# Printing original list
print("List of List = ", end = " ")
print(listofList)

nonEmptyList = [] 
# eliminating empty lists using the filter method...
nonEmptyList = list(filter(None, listofList))

# Printing list without empty list
print("List without empty list: ", end = " " )
print(nonEmptyList)

Output:

List of List =  [[5], [54, 545, 9], [], [1, 4, 7], [], [8, 2, 5]]
List without empty list:  [[5], [54, 545, 9], [1, 4, 7], [8, 2, 5]]

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