currency_converter/currency_converter.py
def convert(self, amount, currency, new_currency='EUR', date=None):
        """Convert amount from a currency to another one.

        :param float amount: The amount of `currency` to convert.
        :param str currency: The currency to convert from.
        :param str new_currency: The currency to convert to.
        :param datetime.date date: Use the conversion rate of this date. If this
            is not given, the most recent rate is used.

        :return: The value of `amount` in `new_currency`.
        :rtype: float

        >>> from datetime import date
        >>> c = CurrencyConverter()
        >>> c.convert(100, 'EUR', 'USD', date=date(2014, 3, 28))
        137.5...
        >>> c.convert(100, 'USD', date=date(2014, 3, 28))
        72.67...
        >>> c.convert(100, 'BGN', date=date(2010, 11, 21))
        Traceback (most recent call last):
        RateNotFoundError: BGN has no rate for 2010-11-21
        """
        for c in currency, new_currency:
            if c not in self.currencies:
                raise ValueError('{0} is not a supported currency'.format(c))

        if date is None:
            date = self.bounds[currency].last_date
        else:
            try:
                date = date.date()  # fallback if input was a datetime object
            except AttributeError:
                pass

        r0 = self._get_rate(currency, date)
        r1 = self._get_rate(new_currency, date)

        return float(amount) / r0 * r1
def convert(self, amount, currency, new_currency='EUR', date=None):
        """Convert amount from a currency to another one.

        :param float amount: The amount of `currency` to convert.
        :param str currency: The currency to convert from.
        :param str new_currency: The currency to convert to.
        :param datetime.date date: Use the conversion rate of this date. If this
            is not given, the most recent rate is used.

        :return: The value of `amount` in `new_currency`.
        :rtype: float

        >>> from datetime import date
        >>> c = CurrencyConverter()
        >>> c.convert(100, 'EUR', 'USD', date=date(2014, 3, 28))
        137.5...
        >>> c.convert(100, 'USD', date=date(2014, 3, 28))
        72.67...
        >>> c.convert(100, 'BGN', date=date(2010, 11, 21))
        Traceback (most recent call last):
        RateNotFoundError: BGN has no rate for 2010-11-21
        """
        for c in currency, new_currency:
            if c not in self.currencies:
                raise ValueError('{0} is not a supported currency'.format(c))

        if date is None:
            date = self.bounds[currency].last_date
        else:
            try:
                date = date.date()  # fallback if input was a datetime object
            except AttributeError:
                pass

        r0 = self._get_rate(currency, date)
        r1 = self._get_rate(new_currency, date)

        return float(amount) / r0 * r1
Convert amount from a currency to another one.

        :param float amount: The amount of `currency` to convert.
        :param str currency: The currency to convert from.
        :param str new_currency: The currency to convert to.
        :param datetime.date date: Use the conversion rate of this date. If this
            is not given, the most recent rate is used.

        :return: The value of `amount` in `new_currency`.
        :rtype: float

        >>> from datetime import date
        >>> c = CurrencyConverter()
        >>> c.convert(100, 'EUR', 'USD', date=date(2014, 3, 28))
        137.5...
        >>> c.convert(100, 'USD', date=date(2014, 3, 28))
        72.67...
        >>> c.convert(100, 'BGN', date=date(2010, 11, 21))
        Traceback (most recent call last):
        RateNotFoundError: BGN has no rate for 2010-11-21