Python Program to Remove Duplicate Elements from a List

In this tutorial you will learn to write a Python Program to Remove Duplicate Elements from a List.

The function that we create here will take a list which as duplicate elements as a parameter and it will return a list without any duplicates.

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[ammadammad]

Can we count the duplicate numbers In a list without using count built-in function?
I want an output like...
(Number, repeated x times)

[fredsoda]

Thank you. I appreciate your Support for the Community.

[mayank]

You made your code so complex you could just convert the list to sets and all duplicates would be gone

[gianlucacaredda]

I am trying to print also the noduplist by the console tells me that it is not defined. What should I do ??

[riadalhasanabir]

thank you so much it solved my assignment

[mR_rb]

Thanks sire u helped me solve my assignment 🇳🇬💗💗

[carlfernandez]

Can't you sort it, loop through the array comparing it to the last element and if so delete that that element/append it if not, to a noduplist. Then it sorts in nlog(n) time and runs in n time. This will run in worst case (n/2)^2. which is worse after 8 elements.

[susantaVlogs]

for loop would be performance killer if we have a big list...

[alfonsoramirezelorriaga]

It would be great if you could show how to do it withouth the "not in" method. That is what I am trying to do. I am trying to loop through "unique" and if "i" is not equal to "j" then I append i to unique. However, I am doing something wrong sintaxis wise.

[sumitbhoi]

For elements in duplist likhna jaruri hai kya ?

[RohitRaj-ntot]

It's not working in my system. Error says function object not iterable

[timechannel]

but how to remove duplicate with that number for example numbers=[2, 2, 4, 4, 6, 8, 8, 9] it will be unique =[6, 9] . how to solve that problem?

[mohammadaslam]

Sir pls.. say sir
Noduplist is a empty list
But how we check if the element present in noduplist or not...

[AttachmentStudios]

Use this rather maybe if you wanna reduce lines of code:

# Function
remove_duplicates = lambda input_list:list(dict({key:0 for key in input_list}))

# Example/Usage
my_list = [...]
my_list = remove_duplicates(my_list)

[telugughostloverskaadda]

Please tell me how to remove alternative eliminats in a list

[_shubhambirhade]

This program question is asked in every interview

[vashistathakuri]

You can just convert it to a set and convert it back to a list.

[cedar]

when I heard an Indian accent I knew, I'd learn something today.

[areebtahir]

Sir ye har value ke liye kam nhi krega.
While loop se krye ek baar

[pennywise]

Bro u put that duplicate list into set datatype and you again convert the set to the list data type and print the list like this
List1=[ 1, 5, 6, 4, 2, 3, 3, 3]
Set1=set(list1)
List1= list(set1)
Print(list1)