ex3

ex3.py

#Diego Javier Sosa Torres
#sos14735
#ejercicio3 seccion1

#logica principal del programa
def main() -> None:
    persons_dict_list = []
    selected_option = None

    while True:
        try:
            print("Menu\n 1. Insert person\n 2. Calculate statistics\n 3. Close")
            selected_option = int(input("selected option: "))

            if selected_option == 1:
                persons_dict_list = new_person(input("insert person: "), persons_dict_list)
            if selected_option == 2:
                persons_dict_list = calculate_statistics(persons_dict_list)
            if selected_option == 3:
                print("closing.. ")
                break
        except:
            print("incorrect selected option")
            break

#flujo de ingreso nueva persona a la lista
def new_person(person, persons_dict_list) -> list:
    months_dict = {
        'enero': 1,
        'febrero': 2,
        'marzo': 3,
        'abril': 4,
        'mayo': 5,
        'junio': 6,
        'julio': 7,
        'agosto': 8,
        'septiembre': 9,
        'octubre': 10,
        'noviembre': 11,
        'diciembre': 12
    }

    person_parts = person.split(',') if person and person != "" else []

    if len(person_parts) > 1 and person_parts[0] != "" and person_parts[1] != "":
        date = person_parts[1]
        date_split = date.split('-')

        if '-' in date and len(date_split) == 3 and date_split[1] != "" and date_split[1] in months_dict and len(list(date_split[2])) == 4:
            date_number = calculate_date_number(
                int(date_split[0]), 
                int(months_dict[date_split[1]]), 
                sum(list(map(lambda digit: int(digit), date_split[2])))
            )

            persons_dict_list.append({ 'person': person_parts[0], 'date_number': date_number })
        else: 
            print('bad format')
    else:
        print('bad format')

    return persons_dict_list

#calcular la fecha resultante    
def calculate_date_number(day, month, sum_of_digits):
    return day + month + sum_of_digits


#flujo de impresion de estadisticas y ordernar la lista
def calculate_statistics(persons_dict_list):
    persons_dict_list = sorted(persons_dict_list, key=lambda a: a['date_number'], reverse=False)

    if len(persons_dict_list) > 0:
        print("highest number: ", persons_dict_list[0])

    if len(persons_dict_list) > 1:
        print("second highest number: ", persons_dict_list[1])

    if len(persons_dict_list) > 2:
        print("third highest number: ", persons_dict_list[2])
    
    return persons_dict_list

main()

This part sum(list(map(lambda digit: int(digit), date_split[2]))) can be written like sum([int(date_digit) for date_digit in date_split[2]]) with list comprehension

or something like
list_date_digit = [] for date_digit in date_split[2]: list_date_digit.append(int(date_digit)) sum(list_date_digit)