Python – Ways to remove duplicates from listThis article focuses on one of the operations of getting the unique list from a list that contains a possible duplicated. Remove duplicates from list operation has large number of applications and hence, it’s knowledge is good to have. Show
Method 1 : Naive method
Output : The original list is : [1, 3, 5, 6, 3, 5, 6, 1] The list after removing duplicates : [1, 3, 5, 6]Method 2 : Using list comprehension
Output : The original list is : [1, 3, 5, 6, 3, 5, 6, 1] The list after removing duplicates : [1, 3, 5, 6] Method 3 : Using set()
Output : Method 4 : Using list comprehension + enumerate()
Output : The original list is : [1, 5, 3, 6, 3, 5, 6, 1] The list after removing duplicates : [1, 5, 3, 6]Method 5 : Using collections.OrderedDict.fromkeys()
Output : The original list is : [1, 5, 3, 6, 3, 5, 6, 1] The list after removing duplicates : [1, 5, 3, 6]
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Learn how to remove duplicates from a List in Python. ExampleRemove any duplicates from a List:
mylist = ["a", "b", "a", "c", "c"]
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Remove duplicates from list using SetTo remove the duplicates from a list, you can make use of the built-in function set(). The specialty of set() method is that it returns distinct elements. We have a list : [1,1,2,3,2,2,4,5,6,2,1]. The list has many duplicates which we need to remove and get back only the distinct elements. The list is given to the set() built-in function. Later the final list is displayed using the list() built-in function, as shown in the example below. The output that we get is distinct elements where all the duplicates elements are eliminated.my_list = [1,1,2,3,2,2,4,5,6,2,1] my_final_list = set(my_list) print(list(my_final_list)) Output: Remove Duplicates from a list using the Temporary ListTo remove duplicates from a given list, you can make use of an empty temporary list. For that first, you will have to loop through the list having duplicates and add the unique items to the temporary list. Later the temporary list is assigned to the main list. Here is a working example using temporary list. my_list = [1, 2, 3, 1, 2, 4, 5, 4 ,6, 2] print("List Before ", my_list) temp_list = [] for i in my_list: if i not in temp_list: temp_list.append(i) my_list = temp_list print("List After removing duplicates ", my_list)Output: List Before [1, 2, 3, 1, 2, 4, 5, 4, 6, 2] List After removing duplicates [1, 2, 3, 4, 5, 6]Python: 5 Ways to Remove Duplicates from ListIn this article, we will learn what is a list in python. As a python list is a collection of multiple elements even containing duplicates, sometimes it is necessary to make the list unique. Here, we are going to study the multiple ways to remove duplicates from the list in python. So, let's get started! Remove Duplicates From List in PythonPython Python List Created: February-06, 2021 | Updated: February-21, 2021 A List in Python is a data structure that is used to store data in a particular order. The list can store data of multiple types i.e. int, float, string, another list, etc. Lists are mutable, which means values once created can be changed later. It is represented by square brackets []. myList = [2, 1, 2, 3, 0, 6, 7, 6, 4, 8] print(myList)Output: [2, 1, 2, 3, 0, 6, 7, 6, 4, 8]You can remove duplicate elements from the above list using a for loop as shown below. myList = [2, 1, 2, 3, 0, 6, 7, 6, 4, 8] resultantList = [] for element in myList: if element not in resultantList: resultantList.append(element) print(resultantList)Output: [2, 1, 3, 0, 6, 7, 4, 8]If you don’t want to write this much code, then there are two most popular ways to remove duplicate elements from a List in Python.
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