You should use some user authentication within one App which you have created, or create one App just for managing accounts.

Since you are a beginner you should take a look at Django-admin user authentication.

https://docs.djangoproject.com/en/1.10/topics/auth/

Your question is not clear as to what you want to place. Is the template files you want to place in or the view function “logout” and “login”? I assume it has to be the “login” and “logout” function what you are looking for.

You have to create a views.py file under “[projectname]/apps” folder.

view for login

def login_validate(request):
      if request.method == "POST":
          username = request.POST['username']
          password = request.POST['password']
          user = authenticate(username= username, password= password)
          if user is not None:
             login(request,user)
             return HttpResponseRedirect('/--template name--/')

          else:
             return HttpResponseRedirect('/--template name--/')

       else:
             return HttpResponseRedirect('/--template name--/')


view for logout

    def logout_page(request):
        logout(request)
        return render(request,"logout_page.html",{})


Above are the functions. You will have to add few things in settings.py before doing this.
And also create a urls.py file under apps folder and link it to main urls.py file.
I hope this is clear.
https://docs.djangoproject.com/en/1.10/topics/auth/default/
https://www.youtube.com/watch?v=eMGtdtNR4es
The above links are helpful.

The answer to the question is quite subjective i.e. varies from project to project, or developer to developer. My suggestions ‘d be:

1. As you have asked for the log-in and log-out functions, this means you’ll be handling users for your app – so a good approach ‘d be to have a users app, and place the functions in users/views.py

2. For complex system – where you may have different types of users i.e. users, admin_users, partners, etc. You can have separate directory at project root e.g. lib/ and have functions.py in it, keep all the project wide usable functions, utilities in this file.

   projectname]/                  <- project root 
   ├── [projectname]/              <- Django root
   │   ├── __init__.py
   │   ├── settings/
   │   ├── urls.py
   │   └── wsgi.py
   ├── myapp/
   │   ├─ __init__.py
   │   └── view.py
   │
   ├── lib/
   │   ├─ __init__.py
   │   └── functions.py
   │
   ├── manage.py
   │
   ├── static/
   │   └── GLOBAL STATIC FILES
   └── templates/
       └── GLOBAL TEMPLATES