django contrib admin templatetags app_tags py from django import templ

#django/contrib/admin/templatetags/app_tags.py

from django import template
register = template.Library()

def my_app_name(app_name):
    try:
        app = __import__(app_name.lower())
        return app.app_label
    except:
        return app_name

my_app_name = register.simple_tag(my_app_name)