There's a real easy way of doing this in Django.
Sure you can manually write a check on every single view that requires a login to see if the user is an AnonymousUser:
if isinstance(request.user, AnonymousUser):
or you can just use a decorator and set the LOGIN_URL via the settings.
In your settings file, add:
LOGIN_URL = '/user/login/'
And then in your view:
from django.contrib.auth.decorators import login_required
# code goes here