Question

I have a two lists. Upon passing those two to a custom template tag, it should ZIP them and return the object.

Is it possible? If so how to do that?

The respective operation is :

def zip_tag(arg1, arg2):
    return zip(arg1, arg2)

Answer 1

As Joe says in the comments, I would consider zipping the lists in the view rather than the template. However, it should be possible to do it in the template with an assignment tag (untested code):

@register.assignment_tag
def zip_tag(arg1, arg2):
    return zip(arg1, arg2)

You would use it in your template as follows:

{% zip_tag arg1 arg2 as zipped %}
<ul>
{% for x, y in zipped %}
  <li>x, y<li>
{% endfor %}
</ul>