data: list[int] = [10, 20, 30, 40]


def find_index_standart(items: list[int], target: int) -> int:
    print(find_index_standart.__name__)
    for id in range(len(items)):
        if items[id] == target:
            return id
    return -1


def find_index_enumerate(items: list[int], target: int) -> int:
    print(find_index_enumerate.__name__)
    for id, val in enumerate(items):
        if val == target:
            return id
    return -1


id = data.index(30)

print("Без функции", id)
print(find_index_standart(items=data, target=30))
print(find_index_enumerate(items=data, target=30))