Math Tags in Django Template Django.How

Check difference > or <

 {% if x > 5 %} # You need some spaces

Show limited float fractions

 {{word_count_difference|floatformat:-2 }}
 

 

Way 1: Built-in widthratio template tag

    a*b use {% widthratio a 1 b %}
    a/b use {% widthratio a b 1 %}

 

Way 2: Template filters

from django import template

register = template.Library()

@register.filter
def multiply(value, arg):
    return value * arg

 

In template

{{ quantity | multiply:price }}

 

Way 3: Add the calculation as a function in your model!

Class LineItem:
    product = models.ForeignKey(Product)
    quantity = models.IntegerField()
    price = models.DecimalField(decimal_places=2)

    def line_total(self):
        return self.quantity * self.price

 

In template

{{ line_item.line_total }}

 

Way 4: In view

Compute inside the view

Way 5: Use mathfilters library

• more here https://pypi.org/project/django-mathfilters/

{{ answer|mul:0.5 }}

 

Resources:

• https://stackoverflow.com/questions/18350630/multiplication-in-django-template-without-using-manually-created-template-tag