How to check for duplicates in a list and remove them in Python

A list is a collection of data which can be the same as each other.

There are many methods to remove the duplicates.

Table of Contents

Use set()

The set() method creates a set in Python, which doesn’t accept duplicated entries. Our approach is to use set() to convert a list to a set, then compare the length of original list with the new set.

numbers = [0, 1, 2, 3, 1, 3, 5, 9]
numbers_set = set(numbers)
if len(numbers) == len(numbers_set):
	print('No duplicate')
	print('There are ' + str(len(numbers) - len(numbers_set)) + ' duplicates')

Use any()

The any() function takes an iterable (list, string, dictionary etc.) and returns True if any element of the iterable is True. If not, it returns False.

numbers = [7, 2, 5, 2, 1, 5, 5, 8]
dup = any(numbers.count(element) > 1 for element in numbers)

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