Puzzle 14 - Recursive List Unpacking (with duplicates)

You’ve been given a jumbled guest list where names are stored in a nested structure of lists within lists. Some guests appear more than once — that’s okay. Your goal is to recursively unpack this structure into a flat list, keeping all duplicates and preserving the original order. This recursive solution should work with any level of nesting.

Input & Expected Output

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Input List

Guests = ["John Doe","Jane Doe",["Emily Doe","John Doe","Michael Smith"],["sarah Johnson",["Michael Smith","David Brown","Alice Green"],"Bob White","Alice Green"]]

Try solving the question yourself! If you need help, click below to reveal the solution.

def lisunpack(lst):
    unpacked = []
    for item in lst:
        if type(item)  == list:
            unpacked.extend(lisunpack(item))
        else:
            unpacked.append(item)
    return unpacked


finalList = lisunpack(Guests)
print("##  Input List  #####")
print(Guests)
print("##  OutPut List  #####")
print(finalList)