how to create the app_list variable

Hello all, I am new to django python programming and need some help:
how can i  create  the app_list variable as it is created in a function index on sites.py in django/contrib/admin/ and made it available at each admins template page, actually i want to create a menu in which the top menu items are the installed apps and there sub menus are the models in them. any help will be appreciated.

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