# Remove duplicate lists in tuples (Preserving Order) in Python

PythonServer Side ProgrammingProgramming

When it is required to remove the duplicates present in tuple of list, as well as preserving the order, a list comprehension and the 'set' method can be used.

The list comprehension is a shorthand to iterate through the list and perform operations on it.

Python comes with a datatype known as 'set'. This 'set' contains elements that are unique only. The set is useful in performing operations such as intersection, difference, union and symmetric difference.

Below is a demonstration of the same −

## Example

Live Demo

my_tuple_1 = ([1, 21, 34] , [11, 0, 98], [45, 67, 56])

print("The tuple of list is : ")
print(my_tuple_1)
temp_val = set()

my_result = [elem for elem in my_tuple_1 if not(tuple(elem) in temp_val or temp_val.add(tuple(elem)))]
print("The unique tuple of list is : ")
print(my_result)

## Output

The tuple of list is :
([1, 21, 34], [11, 0, 98], [45, 67, 56])
The unique tuple of list is :
[[1, 21, 34], [11, 0, 98], [45, 67, 56]]

## Explanation

• A tuple of list is defined, and is displayed on the console.
• An empty set is created.
• The tuple of list is iterated over, and if it is not present in the previously defined list, it is added to the list.
• This would result in a set that contains unique values.
• This is assigned to a value.
• It is displayed on the console.
Published on 12-Mar-2021 06:00:05