Format numbers in django templates

Django's contributed humanize application does this:

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

Be sure to add 'django.contrib.humanize' to your INSTALLED_APPS list in the settings.py file.

Building on other answers, to extend this to floats, you can do:

{% load humanize %}
{{ floatvalue|floatformat:2|intcomma }}

Documentation: floatformat, intcomma.

Regarding Ned Batchelder's solution, here it is with 2 decimal points and a dollar sign. This goes somewhere like my_app/templatetags/my_filters.py

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

register = template.Library()

def currency(dollars):
    dollars = round(float(dollars), 2)
    return "$%s%s" % (intcomma(int(dollars)), ("%0.2f" % dollars)[-3:])

register.filter('currency', currency)

Then you can

{% load my_filters %}
{{my_dollars | currency}}

Try adding the following line in settings.py:

USE_THOUSAND_SEPARATOR = True

This should work.

Refer to documentation.

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update at 2018-04-16:

There is also a python way to do this thing:

>>> '{:,}'.format(1000000)
'1,000,000'