# How To Remove Duplicates From A List Of Lists In Python

To remove duplicates from a list of lists in Python, you can use two ways: using the sorted() function in combination with the set() function and using the map() function in combination with the set() function. Read the following article for more information.

## Remove duplicates from a list of lists in Python

### Use the sorted() function

Syntax:

sorted(object, key=None, reverse=False)

Parameters:

• object: a string, an interpolator, or an iterator object.
• key: sorted() function with key value, then sort. The default is none.
• reverse: default value is False. If reverse = True, the list will sort reverse.

The sorted() function in Python sorts the elements of an object in a particular order (ascending or descending) and returns the object as a sorted list.

Example:

• Initialize a list of arrays where some of the arrays are the same.
• Use the sorted() function to sort the list.
• Convert the list of tuples to a set to eliminate duplicates.
• Note: Remember to convert the nested list to a tuple before converting it to a set because lists are mutable and non-hashable and cannot be a member of a set.
• Finally, use the list() function to return the results to a list.
# The list consists of sublists
myList = [[0, 0, 1], [1, 1, 0], [1, 1, 0], [1, 2, 3], [4, 5, 6]]

# Use the sorted() and set() function
result = list(set(tuple(sorted(i)) for i in myList))

print("List after removing the same sublists: ", result)

Output:

List after removing the same sublists: [(1, 2, 3), (0, 0, 1), (4, 5, 6), (0, 1, 1)]

### Use the map() and set() function

Syntax:

map(func,iterable)

Parameters:

• func: given function to iterate over the elements of iterable.
• iterable: the object you want to browse.

Example:

• Initialize a list of arrays where some of the arrays are the same.
• The map function converts the list to a tuple object that can be hashed (so that the list is a set member).
• Use the set() function to remove duplicates of the same.
• Finally, use the list() function to return the results to a list.
# The list consists of sublists
myList = [[0, 0, 1], [1, 1, 0], [1, 1, 0], [1, 2, 3], [4, 5, 6]]

# Use the map() and set() functions to remove duplicates from a list of lists
result=list(set(map(tuple,myList)))

print("List after removing the same sublists: ", result)

Output:

List after removing the same sublists: [(1, 2, 3), (0, 0, 1), (1, 1, 0), (4, 5, 6)]

## Summary

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