Django test if the variable is numeric -

looks question should covered, after spending time, did not find how check variable numeric in django template.

{% if my_var.isnumeric %}     # {% endif %} 

update learnt below discussion, there seems no built-in tag check this, , end having create our own template tag.

assuming "numeric" means "contains digits" (and no decimal point, no minus sign, etc.)

custom filter best bet:

from django import template  register = template.library()   @register.filter(is_safe=true) def is_numberic(value):     return "{}".format(value).isdigit() 

docs custom template filters: https://docs.djangoproject.com/en/1.9/howto/custom-template-tags/

usage in templates:

{% load your_custom_lib %} ... {% if something|is_numberic %}... 

---

if consider integers numeric (positive , negative), function becomes:

try:     int("{}".format(value)) except valueerror:     return false else:     return true 

in case "numeric" means "integer or float", use float instead of int. note recognize -12e3 numeric, because:

>>> -12e3 -12000.0