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Invited twice

#054Mini challengeListsLoops6 min

Several friends wrote the party guest list together, and some names went on more than once. Write invited_twice(guests) to return the repeated names, each name only once, in the order the repeats were found. No repeats means an empty list.

Examples

invited_twice(["Ana", "Ben", "Ana", "Cal"])→['Ana']

invited_twice(["Ivy", "Max", "Max", "Ivy", "Max"])→['Max', 'Ivy']

invited_twice(["Lu", "Kim"])→[]

main.py

def invited_twice(guests):
    seen = []
    repeated = []
    for name in guests:
        # your code here: seen before and not yet noted? note it
        seen.append(name)
    return repeated

Ctrl + Enter runs too

Result

Run tries the examples. When they look right, Submit.