Create a list of all unknown user agents in a django-request django project.

unknown_browsers.py

# This code grabs all unknown browsers in django-request on a django project.
from request.models import Request
from request.utils import browsers
requests = Request.objects.this_month().only('user_agent')
user_agents = [request.user_agent for request in requests]
unknown_agents = [agent for agent in user_agents if browsers.resolve(agent)[0] == 'Unknown']
print unknown_agents