Django resolve variable with variable value tag

resolve.py

"""
Resolve lookup based on variable value
--------------------------------------

{% resolve foovar foodict %} # does django's Variable(foovar).resolve(foodict)

Created on Monday, February 2012 by Yuji Tomita
"""
from django import template
from django.template.base import Variable, VariableDoesNotExist

register = template.Library()


@register.assignment_tag()
def resolve(lookup, target):
    try:
        return Variable(lookup).resolve(target)
    except VariableDoesNotExist:
        return None