How to remove duplicates from a list in Python?

To remove duplicates from a list in Python, we can use various methods discussed in this article.

Use a dictionary to remove duplicates from a list

Example

In this example we will use OrderedDict to remove duplicates from a list -

from collections import OrderedDict

# Creating a List with duplicate items
mylist = ["Jacob", "Harry", "Mark", "Anthony", "Harry", "Anthony"]

# Displaying the List
print("List = ",mylist)

# Remove duplicates from a list using dictionary
resList = OrderedDict.fromkeys(mylist)

# Display the List after removing duplicates
print("Updated List = ",list(resList))

Output

List =  ['Jacob', 'Harry', 'Mark', 'Anthony', 'Harry', 'Anthony']
Updated List =  ['Jacob', 'Harry', 'Mark', 'Anthony']

Remove duplicates from a list using list comprehension

Example

In this example, we will use list comprehension to remove duplicates from a list −

# Creating a List with duplicate items
mylist = ["Jacob", "Harry", "Mark", "Anthony", "Harry", "Anthony"]

# Displaying the List
print("List = ",mylist)

# Remove duplicates from a list using List Comprehension
resList = []
[resList.append(n) for n in mylist if n not in resList]
print("Updated List = ",resList)

Output

List =  ['Jacob', 'Harry', 'Mark', 'Anthony', 'Harry', 'Anthony']
Updated List =  ['Jacob', 'Harry', 'Mark', 'Anthony']

Use Set to remove duplicates from a list

Example

In this example, we will use the set() method to remove duplicates from the list -

# Creating a List with duplicate items
mylist = ["Jacob", "Harry", "Mark", "Anthony", "Harry", "Anthony"]

# Displaying the List
print("List = ",mylist)

# Remove duplicates from a list using Set
resList = set(mylist)
print("Updated List = ",list(resList))

Output

List =  ['Jacob', 'Harry', 'Mark', 'Anthony', 'Harry', 'Anthony']
Updated List =  ['Anthony', 'Mark', 'Jacob', 'Harry']

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