Task_Orders_Dic_Compr

def orders():
    dictionary_value = {}
    dictionary_quantity = {}

    while True:
        command = input().split(" ")
        if command[0] == "buy":
            break


        index_one = str(command[0])
        index_two = float(command[1])            # Price
        index_three = int(command[2])

        if index_one not in dictionary_quantity.keys():
            dictionary_quantity[index_one] = index_three
        else:
            dictionary_quantity[index_one] += index_three

        if index_one not in dictionary_value.keys():
            dictionary_value[index_one] = index_two

        if index_two not in dictionary_value.values():
            dictionary_value[index_one] = index_two

    result = {k: dictionary_value[k] * dictionary_quantity[k] for k in dictionary_value}

    for key,value in result.items():
        print(f"{key} -> {value:.2f}")

orders()