roomate

roommate_dict = {
    'Alice': {'age': 25, 'city': 'New York'},
    'Bob': {'age': 27, 'city': 'Paris'},
    'Charlie': {'age': 29, 'city': 'London'},
    'Dan': {'age': 31, 'city': 'Berlin'},
    'Ed': {'age': 33, 'city': 'Madrid'},
    'Frank': {'age': 35, 'city': 'Barcelona'},
    'George': {'age': 37, 'city': 'Rome'},
    'Harry': {'age': 39, 'city': 'Amsterdam'},
    'Ivan': {'age': 41, 'city': 'Stockholm'},
    'John': {'age': 43, 'city': 'Vienna'},
    'Kevin': {'age': 45, 'city': 'Zurich'},
    'Linda': {'age': 47, 'city': 'Hamburg'},
    'Mark': {'age': 49, 'city': 'Munich'},
    'Nancy': {'age': 51, 'city': 'Frankfurt'},
    'Olivia': {'age': 53, 'city': 'Bremen'},
    'Peter': {'age': 55, 'city': 'Dortmund'},
    'Quinn': {'age': 57, 'city': 'Leipzig'},
    'Robert': {'age': 59, 'city': 'Cologne'},
    'Sandra': {'age': 61, 'city': 'Dresden'},
    'Tim': {'age': 63, 'city': 'Hannover'},
    'Ulf': {'age': 65, 'city': 'Bergen'},
    'Victor': {'age': 67, 'city': 'Aachen'},
    'Wendy': {'age': 69, 'city': 'Frankfurt'},
    'Xavier': {'age': 71, 'city': 'Stuttgart'},
    'Yvonne': {'age': 73, 'city': 'Hannover'},
    'Zoe': {'age': 75, 'city': 'Munich'}
}


cost = 25

for each_roommate in (roommate_dict.keys()):
    roommate_name = set(list(roommate_dict.keys()))
    user_input = input(f'will ({each_roommate}) pay "full" or "half" this month?').casefold()
    if user_input == "half":
        roommate_dict[each_roommate]["cost"] =  cost/2
    elif user_input == "full":
        roommate_dict[each_roommate] ["cost"] = cost
    else:
        print("Please enter 'half' or 'full'")