Question

Model.objects.filter(pk__in=[list of ids])

and

Model.objects.filter(pk__in=[1,2,3])

How do I show this data in a template?

def xx(request):
    return HttpResponse(Model.objects.filter(pk__in=[1,2,3]))

Answer 1

It means, give me all objects of model Model that either have 1,2 or 3 as their primary key.

See Field lookups – in.

You get a list of objects back you can show them in the template like every other list, using the for template tag:

{% for object in objects %}
    Some value: {{ object.value }}
{% endfor %}

To learn how to create a Django application you should read the tutorial or the Django book.