Python Program to Remove Duplicate Element From a List

In this example, you will learn to remove duplicate elements from a list.

To understand this example, you should have the knowledge of the following Python programming topics:

• Python Sets
• Python List

1. Example 1: Using set()

list_1 = [1, 2, 1, 4, 6]

print(list(set(list_1)))

Output

[1, 2, 4, 6]

In the above example, we first convert the list into a set, then we again convert it into a list. Set cannot have a duplicate item in it, so set() keeps only an instance of the item.

2. Example 2: Remove the items that are duplicated in two lists

list_1 = [1, 2, 1, 4, 6]
list_2 = [7, 8, 2, 1]

print(list(set(list_1) ^ set(list_2)))

Output

[4, 6, 7, 8]

In the above example, the items that are present in both lists are removed.

• Firstly, both lists are converted to two sets to remove the duplicate items from each list.
• Then, ^ gets the symmetric difference of two lists (excludes the overlapping elements of two sets).