How to store an object in django sessions framework

[shiva krishna]

I have an django and i am trying to store an object in django session 
varaible, and trying to access that in the redirected view, but its showing 
`keyerror`  as below

    def payment(request):
        if request.method == 'POST':
            form = CardForm(request.POST)
            if form.is_valid():
                data = form.cleaned_data
                response = response_from_payment_gateway(data)
                request.session['response'] = response
                return 
HttpResponseRedirect(reverse('paygate:payment_success'))
        else:
            form = CardForm(initial={'number':'4242424242424242'})
        return render_to_response('payment_form.html',{'form': form})


    def PaymentSuccess(request):
        print request.session['response'],"=================>"
        response = None
        return render_to_response("payment_success.html", 
{'response':response}, context_instance=RequestContext(request))


**Result**

    Internal Server Error: /payment/success/
    Traceback (most recent call last):
      File 
"/home/Envs/app/local/lib/python2.7/site-packages/django/core/handlers/base.py",
 
line 115, in get_response
        response = callback(request, *callback_args, **callback_kwargs)
      File "/home/user/virtualenvironment/apps/app/payment/views.py", line 
120, in PaymentSuccess
        print request.session['response'],"=================>"
      File 
"/home/Envs/app/local/lib/python2.7/site-packages/django/contrib/sessions/backends/base.py",
 
line 46, in __getitem__
        return self._session[key]
    KeyError: 'response'


So i am getting back a response object from the payment gateway that 
contains the transaction details, and i am trying to save that in `session 
framework variable` called `response` as above.

And i am trying to access the variable called `response` in the redirected 
view `PaymentSuccess` as `request.session['response']`, and getting the 
above mentioned error.

so how can we send/save the objects in the `sessions` in django ?

In above the response object will be of the following form 

    {'status': 'SUCCESS', 'response': <Charge charge id=ch_2OXdxxxxNVw at 
0xb508e76cL> JSON: {
      "amount": 100, 
      "amount_refunded": 0, 
      "balance_transaction": "txxxn_xxxxxxxxO", 
      "captured": true, 
     "currency": "usd", 
      "customer": null, 
      "description": null, 
    }}

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