How can I write a list without duplicate with only for, if and boolean

Question

My professor gave me an exercise where I write a function that returns a list without the duplicate to the old list. This is the code but I don\'t know how to write the meth

Answer 1

If you need to eliminate duplicates AND preserve order you can do this:

def distinct(lst):
    seen = set()
    for item in lst:
        if item not in seen:
            yield item
            seen.add(item)

---

a = [1,3,1,2,6]

print(list(distinct(a)))

[1,3,2,6]

---

b = ['a','ab','a','ab']

print(list(distinct(b)))

['a', 'ab']

See a demo here: https://ideone.com/a2khCg