Queryset sorting

gistfile1.py

# http://stackoverflow.com/questions/431628/how-to-combine-2-or-more-querysets-in-a-django-view

from itertools import chain
from operator import attrgetter

def join_list(*args, sort_key=None):
    if sort_key:
        return sorted(chain(args), key=attrgetter(sort_key))

return list(chain(args))

gistfile2.py

# Unsorted
teacher_list = assistant_teacher_list | subjectgroup_teacher_list | other_teacher_list

#Sorted
teacher_list = join_list(assistant_teacher_list, subjectgroup_teacher_list, other_teacher_list)