gistfile1.py

import pickle

# Session key
key = 'my_qs'

# Pizza => model example
qs = Pizza.objects.filter(ingredient='tomato')
# Dumping data
request.session[key] = pickle.dumps(qs.query)

# Loading data
pizzas = Pizza.objects.all()[:1]
pizzas.query = pickle.loads(request.session[key])

# Using qs
for pizza in pizzas:
  print(pizza.ingredient)