Funções para convertes moedas brasileiras antigas.

convert_brl.py

import datetime


def convert_brl_date(value: float, date: datetime.date) -> float:
    """Convert brazillian currency to Real (BRL), given the date of the value.
    Works with dates from 1942-11-01 to today.
    """
    if date >= datetime.date(1994, 7, 1):  # R$
        return value
    elif date >= datetime.date(1993, 8, 1):  # CR$
        return value / 2_750
    elif date >= datetime.date(1990, 3, 16):  # Cr$
        return value / 2_750_000
    elif date >= datetime.date(1989, 1, 16):  # NCz$
        return value / 2_750_000
    elif date >= datetime.date(1986, 2, 28):  # Cz$
        return value / 2_750_000_000
    elif date >= datetime.date(1970, 5, 15):  # Cr$
        return value / 2_750_000_000_000
    elif date >= datetime.date(1967, 2, 13):  # NCr$
        return value / 2_750_000_000_000
    elif date >= datetime.date(1942, 11, 1):  # Cr$
        return value / 2_750_000_000_000_000
    else:
        raise ValueError("Date out of range (1942-11-01 => today)")


def convert_brl_currency_symbol(value: float, currency: str) -> float:
    """Convert brazillian currency to Real (BRL), given the currency symbol."""
    if currency == "R$":
        return value
    elif currency == "CR$":
        return value / 2_750
    elif currency == "Cr$":
        return value / 2_750_000
    elif currency == "NCz$":
        return value / 2_750_000
    elif currency == "Cz$":
        return value / 2_750_000_000
    else:
        raise ValueError(f"Currency not recognized ({currency})")


def convert_brl_currency_name(value: float, currency: str) -> float:
    """Convert brazillian currency to Real (BRL), given the currency name."""
    currency = currency.lower()
    if currency == "reais" or currency == "real":
        return value
    elif currency == "cruzeiros reais" or currency == "cruzeiro real":
        return value / 2_750
    elif currency == "cruzeiros" or currency == "cruzeiro":
        return value / 2_750_000
    elif currency == "cruzados novos" or currency == "cruzado novo":
        return value / 2_750_000
    elif currency == "cruzados" or currency == "cruzado":
        return value / 2_750_000_000
    else:
        raise ValueError(f"Currency not recognized ({currency})")