Removing any duplications from a python list

Question

I am trying to remove any elements from a list that has a duplication.

The example that I am trying to achieve is:

a, b, c d, g, h, i, d, c, b, a

would reduce down to: g, h, i

I have found a lot of great ways to remove duplications but I haven't come across a way to remove elements if a duplication exists. Thanks for any assistance

```list(set(['a', 'b', 'c', 'd', 'g', 'h', 'i', 'd', 'c', 'b', 'a']))```? — , Aug 12 '21 at 13:12
As shows in the dup above `[i for i in values if Counter(values)[i] == 1]` (but you should move the `Counter` creation outside your list comprehension. — Cory Kramer, Aug 12 '21 at 13:18
I can not add an answer anymore but how about this: Count the frequency of each element of the list (e.g. using a defaultdict) and then only take those elements with count it. — cherrywoods, Aug 12 '21 at 13:18

cph_sto · Answer 1 · 2021-08-12T15:28:18.447

0

You can do that using collections

import collections
a_list = ['a','b','c','d','g','h','i','d','c','b','a']
counter = collections.Counter(a_list)

a_list_final = [key for key,value in counter.items() if value == 1]
print(a_list_final)
    ['h', 'g', 'i']

edited Aug 12 '21 at 15:28

answered Aug 12 '21 at 13:25

cph_sto

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Removing any duplications from a python list

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