django-mathfilters

django-mathfilters is a pip-installable Python 2/3 module that provides different simple math filters for Django.

Django provides an add template filter, but no corresponding subtracting, multiplying or dividing filters.

Django ticket #361 has been closed as wontfix, so I had to create an alternative that is easy to install in a new Django project.

It currently supports int, float and Decimal types, or any other type that can be converted to int or float.

Installation

$ pip install django-mathfilters

Then add mathfilters to your INSTALLED_APPS.

You need to load mathfilters at the top of your template. The script provides the following filters:

sub – subtraction
mul – multiplication
div – division
intdiv – integer (floor) division
abs – absolute value
mod – modulo
addition – replacement for the add filter with support for float / decimal types

Example:

html

{% load mathfilters %}

...

<h1>Basic math filters</h1>

<ul>

{% with answer=42 %} <li>42 * 0.5 = {{ answer|mul:0.5 }}</li> {% endwith %}

{% with numerator=12 denominator=3 %} <li>12 / 3 = {{ numerator|div:denominator }}</li> {% endwith %}

</ul>

This module supports Python 2.6–2.7 and 3.3–3.5 as well as PyPy and PyPy3.

Supported Django versions are 1.1 through 1.8.

MIT License, see LICENSE file.