[Tutor] Ways of removing consequtive duplicates from a list

[Manprit Singh]

Dear Sir ,

I was just doing an experiment of removing consecutive duplicates from a
list . Did it in the following ways  and it all worked . Just need to know
which one should be preferred ?  which one is more good ?

lst = [2, 2, 3, 3, 3, 2, 2, 5, 5, 6, 3, 3, 3, 3]
# Ways of removing consequtive duplicates
[ele for i, ele in enumerate(lst) if i==0 or ele != lst[i-1]]
[2, 3, 2, 5, 6, 3]
val = object()
[(val := ele) for ele in lst if ele != val]
[2, 3, 2, 5, 6, 3]
import itertools
[val for val, grp in itertools.groupby(lst)]
[2, 3, 2, 5, 6, 3]

Is there anything else more efficient ?

Regards
Manprit Singh