Format numbers in django templates

Question

I'm trying to format numbers. Examples:

1     => 1
12    => 12
123   => 123
1234  => 1,234
12345 => 12,345

It strikes as a fairly common thing to do but I can't figure out which filter I'm supposed to use.

Edit: If you've a generic Python way to do this, I'm happy adding a formatted field in my model.

Answer 1

Well I couldn't find a Django way, but I did find a python way from inside my model:

def format_price(self):
    import locale
    locale.setlocale(locale.LC_ALL, '')
    return locale.format('%d', self.price, True)

Answer 2

As far as I can tell it is not currently possible: Django Users: locale aware number formats

Answer 3

If you don't want to get involved with locales here is a function that formats numbers:

def int_format(value, decimal_points=3, seperator=u'.'):
    value = str(value)
    if len(value) <= decimal_points:
        return value
    # say here we have value = '12345' and the default params above
    parts = []
    while value:
        parts.append(value[-decimal_points:])
        value = value[:-decimal_points]
    # now we should have parts = ['345', '12']
    parts.reverse()
    # and the return value should be u'12.345'
    return seperator.join(parts)

Creating a custom template filter from this function is trivial.

Answer 4

Django's contributed humanize application does this:

{% load humanize %}
{{ my_num|intcomma }}

Answer 5

Be aware that changing locale is process-wide and not thread safe (iow., can have side effects or can affect other code executed within the same process).

My proposition: check out the Babel package. Some means of integrating with Django templates are available.

Answer 6

Regarding Ned Batchelder's solution, here it is with 2 decimal points and a dollar sign.

from django.contrib.humanize.templatetags.humanize import intcomma

def currency(dollars):
    dollars = float(dollars)
    return "$%s%s" % (intcomma(int(dollars)), ("%0.2f" % dollars)[-3:])

Then you can

{{my_dollars | currency}}