storing objects in session

I'm trying to store temporary cart in session, but cart items
disappear after 3-4 page reloads.
This is simplified version of my code, that reproduces the issue:

"""
class C(object):
ITEMS = {}

def pprint(self):
return str(self.ITEMS)

class I(dict):
pass

def my_context_processor(request):
import random

result = {}

if request.session.get('TEMP', None) is None:
request.session['TEMP'] = C()
cart = request.session['TEMP']

if not cart.ITEMS:
i = I()
i.cart = cart
i["a"] = random.randint(1,10)
i["b"] = random.randint(1,10)
cart.ITEMS['blah'] = i
request.session['TEMP'] = cart
request.session.modified = True

result['test'] = cart

return result
"""

In template, after third of fourth reload I see {{ test }} updated,
when it shouldn't. Why ?

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