Currency normalization

[szewczykmira]

In my project I need to format currency so that it won't display digital decimals if they are equal to zero. Right now I'm doing it by replacing .00 to .## in current locale pattern and passing it as format to format_currency and setting currency_digits=False. It works like charm when price has 0 or 2 decimal digits, but I'm not sure how to handle prices with 3 decimal digits. Can I safely replace .00 with . + '#' * decimal_digits or it will cause problems I'm not aware of? Or maybe there is better solution for that?

[akx]

Am I understanding this correctly:

• If the value is integer, print no decimals
• If the value is not integer, print as many decimals as the currency usually would

If so, you can adapt the innards of format_currency (though I admit being able to wholesale override the number of decimals would be handy):

from babel import Locale
from babel.numbers import decimal

def custom_format_currency(value, currency, locale):
    value = decimal.Decimal(value)
    locale = Locale.parse(locale)
    pattern = locale.currency_formats['standard']
    force_frac = ((0, 0) if value == int(value) else None)
    return pattern.apply(value, locale, currency=currency, force_frac=force_frac)

print(custom_format_currency('2.50', 'EUR', 'fi'))
print(custom_format_currency('2.00', 'EUR', 'fi'))

outputs

2,50 €
2 €

[kdeldycke]

@szewczykmira : That's more or less what I did with my unround_pattern() method from #90 (comment). I hack the default format pattern of a local to not let it truncate amounts with lots of decimals. I guess you can reuse it and tweak it to your own needs.

[kdeldycke]

This is addressed by #494.

[igo]

@akx can this zero-stripping feature be added as an option to format_currency()

[picturedots]

Bumping this -- I have a use case where I sometimes want to display currency without any decimals, but not have a solution that requires a different format string for each locale.