Restrict access to the whole application

My first question is whether it is possible to restrict access to the
whole application from one place. I could write @login_required over
every function but is there a better way?

My second question is whether it is possible to use user groups for
restricting applications. I want for example that only users in group
'teachers' could access the 'teaching' application. I know that groups
are meant for something else but it would spare me a lot of time.

I've just started with Django so be patient with me :)

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