cs50p/problems/pset4/adieu/adieu.py

def main():
    names = []
    while True:
        try:
            name = input("Name: ")
            names.append(name)
        except EOFError:
            break
    if len(names) == 0:
        return
    result = "Adieu, adieu, to "
    for n, name in enumerate(names):
        if n == 0:
            result += name
        elif n == 1 and len(names) == 2:
            result += f" and {name}"
        elif n == len(names) - 1:
            result += f", and {name}"
        else:
            result += f", {name}"
    print(result)


if __name__ == "__main__":
    main()