python_number_currency_format.py

import locale
from typing import Union

lc_ctype = 'pt_BR.utf-8'
locale.setlocale(locale.LC_ALL, lc_ctype)


def number_format(val: Union[str, int, float]) -> str:
    """ Number format -> N,NN """

    try:
        number = float(val)
        return locale.format_string('%.2f', number)
    except ValueError:
        return str(val)


def price_format(val: Union[str, int, float]) -> str:
    """ Currency format -> Symbol + N.NNN,NN """

    try:
        price = float(val)
        return locale.currency(price, grouping=True, symbol=True)
    except ValueError:
        return str(val)


if __name__ == "__main__":
    print(number_format('55'))  # 55,00
    print(price_format('5555'))  # R$ 5.555,00