PythonLearning/cars/main.py

import json
from typing import Any, Dict, List


def get_cars() -> Any:                                      # Defining the function get_cars()
    with open('cars.json', 'rt') as f:                      # Opens the cars.json file
        return json.load(f)                                 # Serializes the JSON data into a Python object

def sort(data: Dict[str, str]) -> Dict[str, List[str]]:     # Defining the function sort()
    dictionary: Dict[str, List[str]] = {}                   # Creating an empty dictionary to store the sorted data
    for car, manufacturer in data.items():                  # Iterating through the input data
        if manufacturer not in dictionary:                  # If the manufacturer does not already exist as a key in the new dictionary,
            dictionary[manufacturer] = [car]                # create a new key with the manufacturer as the key and the car as the value, in a list
        else:                                               # If the manufacturer does already exist as a key in the new dictionary,
            dictionary[manufacturer].append(car)            # append the car to the list of cars for that manufacturer
    return dictionary                                       # Return the dictionary object

def save(data: Dict[str, Any]) -> None:
    with open('sorted_cars.json', 'w') as f:         # Opening the file sorted_cars.json for the purpose of writing to it
        json.dump(data, f, indent=2)                 # Dumps the JSON-serialized python object into the sorted_cars.json file, with an indentation of 2

if __name__ == '__main__':
    cars = get_cars()
    sorted_cars = sort(cars)
    save(sorted_cars)
    print("Successfully sorted cars by manufacturer!")