Code mostly works except the second answer problem with quotes in list

    def car_makes(all_cars: str) -> list:
    lst = all_cars.split(",")
        car_brands = []
        for i in lst:
            brand = i.split(" ")
            car_brands.append(brand[0])
            firms = list(dict.fromkeys(car_brands))
        return firms

    if __name__ == '__main__':
    print(car_makes("Audi A4,Skoda Super,Skoda Octavia,BMW 530,Seat Leon,Skoda Superb,Skoda Superb,BMW x5"))
    print(car_makes(""))

 
answers

    ['Audi', 'Skoda', 'BMW', 'Seat']
    []

Code mostly works except the second answer has to stay empty but I get [”]. What am I missing here?

>Solution :

From the str.split documentation:

Splitting an empty string with a specified separator returns [''].

You could check whether the given string is empty and return an empty list in that case:

def car_makes(all_cars: str) -> list:
    if all_cars == "":
        return []
    lst = all_cars.split(",")
    # ...
    return firms