filter_non_unique

내가 푼 것  

from collections import Counter
def fnu(lst):
    counter = Counter(lst)
    nl = []
    for u in counter:
        if counter[u] == 1 :
            nl.append(u)
    print(nl)

>>>

fnu([1,2,2,3,4,4,5]) #[1,3,5]

제공하는 답

print([item for item, count in Counter(lst).items() if count == 1]