Roman K

sudo add-apt-repository ppa:fkrull/deadsnakes
sudo apt-get update
sudo apt-get install python3.5

class SessionModeMiddleware(object):
    def process_request(self, request):
        if 'mode' not in request.session:
            request.session['mode']  = 'm'
            request.session.save()

urlpatterns = static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT) + [
    url(r'^', views.IndexView.as_view(), name='index'),
]

with open('A.txt') as a, open('B.txt') as b, open('finish.txt', 'w') as finish:
    a_items = [l.strip() for l in a]
    b_set = {l.strip() for l in b}
    finish.write('\n'.join(item for item in a_items if item not in b_set))

with open('A.txt') as a, open('B.txt') as b, open('finish.txt', 'w') as finish:
    a_set = {l.strip() for l in a}
    b_set = {l.strip() for l in b}
    finish.write('\n'.join(a_set - b_set))

Не будет ли плохим тоном, если в одном views будут и классы, и функции?

def get_context_data(self, **kwargs):
    kwargs['your_additional'] = 'context_here'
    return super().get_context_data(**kwargs)

recipes = open('items.json', 'r')
parsed_recipes = json.load(recipes)

def rand_item():
    return random.choice(parsed_recipes["items"])