Avoid duplicate items Python

Question

I am having an issue with duplicate items in a list in python.

For example I have this list

i = ['hello', 'hi', 'bye', 'welcome', 'hi', 'bye'] 

I want to print every item once, even if it's duplicated print it once.

Is there any way to do it in python?

Answer 1

If the order doesn't matters, then you can use a set:

print(set(i))

Otherwise you can do something like this:

seen = set()
for e in i:
    if e not in seen:
        print(e)
        seen.add(e)