My question is different from removing duplicate

removing duplicate:

list_1 = [1, 2, 3, 4, 4, 3, 3, 7]

will become
you only keep one of the duplicated values

list_1 = [1, 2, 3, 4, 7]

My Question:

list_1 = [1, 2, 3, 4, 4, 3, 3, 7]

will become
you don’t keep any of the duplicated values

list_1 = [1, 2, 7]

>Solution :

The following will work:

list_1 = [1, 2, 3, 4, 4, 3, 3, 7]
res = [i for i in list_1 if list_1.count(i) == 1]

>>>print(res)
[1, 2, 7]