I have a decorator that I use for my views @valid_session

from django.http import Http404

def valid_session(the_func):
"""
function to check if the user has a valid session
"""
def _decorated(*args, **kwargs):        
    if ## check if username is in the request.session:
        raise Http404('not logged in.')
    else:
        return the_func(*args, **kwargs)
return _decorated

I would like to access my session in my decoartor. When user is logged in, I put the username in my session.