How to do arithmetic with Django template

Introduction

By using a module called django-mathfilters, you can perform arithmetic processing on the template. In this article, I'll show you how to implement it.

reference

django-mathfilters · PyPI

environment

Python(3.6.2) Django(2.1.7)

Installation method

Install django-mathfilters

pip install django-mathfilters

Added math filters to INSTALLED_APPS

settings.py


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'sass_processor',
    'storages',
    'mathfilters', #← Add
]

Load from template

- load mathfilters

Now you can perform arithmetic processing on the template.

Calculation method

--sub – Subtraction --addition – addition --mul – Multiplication --div – division --intdiv – Integer division --abs – Absolute value --mod – Surplus

python:template_file.html.haml


- load mathfilters

%ul
  %li
    10 - 2 = {{ 10 | sub:2 }}  # 8
  %li
    10 + 5 = {{ 10 | addition:5 }} # 15
  %li
    10 × 3 = {{ 10 | mul:3 }} # 30
  %li
    10 ÷ 2 = {{ 10 | div:2 }} # 5
  %li
    | -10 | = {{ -10 | abs }} # 10
  %li
    20 ÷ 3 = {{ 20 | mod:3 }} # 2

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