[Python] How to set and get session in Django?

I need to set a variable on session, when a user login happens. How can I do this?

if request.user.is_authenticated():
profile = request.user.get_profile()
request.session['idempresa'] = profile.idempresa


My other question is in a form:

class PedidoItensForm(ModelForm):
class Meta:
model = ItensPedido

def __init__(self, *args, **kwargs):
profile = kwargs.pop('vUserProfile', None)
super(PedidoItensForm, self).__init__(*args, **kwargs)


How can I get the "idempresa" value of session, to use in my queryset?

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