How to Remove Duplicates From a Python List

Learn how to remove duplicates from a List in Python.

Remove any duplicates from a List: mylist = ["a", "b", "a", "c", "c"]

First we have a List that contains duplicates: A List with Duplicates mylist = ["a", "b", "a", "c", "c"]

Create a dictionary, using the List items as keys. This will automatically remove any duplicates because dictionaries cannot have duplicate keys. Create a Dictionary mylist = ["a", "b", "a", "c", "c"]

dict.fromkeys(mylist) )

Then, convert the dictionary back into a list: Convert Into a List mylist = ["a", "b", "a", "c", "c"]

dict.fromkeys(mylist) )

Now we have a List without any duplicates, and it has the same order as the original List.

Print the List mylist = ["a", "b", "a", "c", "c"]

If you like to have a function where you can send your lists, and get them back without duplicates, you can create a function and insert the code from the example above.

Create a function that takes a List as an argument. Create a Function def my_function(x):

Create a dictionary, using this List items as keys. Create a Dictionary def my_function(x):

) mylist = my_function(["a", "b", "a", "c", "c"])

Convert the dictionary into a list. Convert Into a List def my_function(x):

) mylist = my_function(["a", "b", "a", "c", "c"])

Return List def my_function(x):

Call the function, with a list as a parameter: Call the Function def my_function(x):

Print the Result def my_function(x):