How to flatten a list of tuples and remove the duplicates?

Question

I'm trying to remove the duplicates out of tuples in a list and add them in a new list with out duplicates,

I tried to make two loops but and check for duplicates or sets but the problem there's three tuples

can anyone help me, I'm stuck here

example

[(2, 5), (3, 5), (2, 5)]

Output

[2, 3, 5]

Answer 1

If order isn't important, you can make a set, add each element of each tuple to the set, and the set is your result.

s = set()
for tup in lst:
    for el in tup:
        s.add(el)
# or use a set comprehension:
# # s = {el for tup in lst for el in tup}

If order IS important, you can do mostly the same, but also have a result list to add to.

s = set()
result = []
for tup in lst:
    for el in tup:
        if el not in s:
            s.add(el)
            result.append(el)