How to make list of cars into string?

Question

Please help with this function:

def car_list_as_string(cars: list) -> str:
    """
    Create a list of cars.
    The order of the elements in the string is the same as in the list.

    [['Audi', ['A4']], ['Skoda', ['Superb']]] =>
    "Audi A4,Skoda Superb"
    """

I tried this, but it’s unfinished… got stuck.

for car in cars:
    print(car)
    cars2 = ''.join(str(car) for car in cars)
    print(cars2)
    one_car = str(car[0])
    print(one_car)
    one_model = str(car[1])
    print(one_model)

Input is:

[['Audi', ['A4']], ['Skoda', ['Superb']]]

Output should be:

"Audi A4,Skoda Superb"

Asked By: medprogram

||

Source

Answer 1

Try something like this, this is one approach to make your list of cars into string

def car_list_as_string(cars: list) -> str:
    car_names = []
    for car in cars:
        car_names.append(f"{car[0]} {car[1][0]}")
    return ", ".join(car_names)

Answered By: Myth

Answer 2

iterate over makes and models at once using a for loop
construct the full names and append them to a list
join the list into a single string

def car_list_as_string(cars: list) -> str:
    car_names = []
    for make, models in cars:
        car_names.append(' '.join([make, models[0]]))
    return ", ".join(car_names)

Or to avoid indexing as Yevhen Kuzmovych suggested:

def car_list_as_string(cars: list) -> str:
    car_names = []
    for make, (model,) in cars:
        car_names.append(' '.join([make, model]))
    return ", ".join(car_names)

The (model,) syntax means "unpack the 2nd element into a one element tuple".

Answered By: Gameplay

Answer 3

For badly readable one-liners, this can work:

", ".join(f"{brand} {model}" for brand, models in dict(cars).items() for model in models)

Answered By: 9769953

Answer 4

If you want a code who also work for multiple nested models:

def car_list_as_string(cars: list):
    output_list: list[str] = []

    for brand, models in cars:
        for model in models:
            output_list.append(f"{brand} {model}")

    cars_string = ",".join(output_list)

Answered By: Jay

Answer 5

The way you do this depends on exactly what the output should look like if the input data are slightly different to that shown in the question.

The data look like this:

data = [['Audi', ['A4']], ['Skoda', ['Superb']]]

This is interesting because there’s no apparent reason for the model designation to be in a list. The implication is that the data might look something like this:

data = [['Audi', ['A4', 'Series II']], ['Skoda', ['Superb']]]

So let’s allow for that construct…

def process(_list):
    return ','.join(' '.join([make] + model) for make, model in _list)

print(process(data))

Output:

Audi A4 Series II, Skoda Superb

Answered By: Fred

How to make list of cars into string?

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