Arguments disappear from a dictionary when passed to a function

Question

In my function I read user's data from session and store them in a dictionary. Next I'm sending it to 'register' function from registration.backend but the function somehow get's it empty and a KeyError is thrown. Where are my data gone ? The code from function calling 'register' function :

data = request.session['temp_data']
email = data['email']

logging.debug(email)

password1 = data['password1']
userdata = {'email': email, 'password1': password1}

logging.debug(userdata)

backend = request.session['backend']

logging.debug(backend)

user = backend.register(userdata)

And the register function (whole source here : http://bitbucket.org/ubernostrum/django-registration/src/tip/registration/backends/default/init.py ) :

class DefaultBackend(object):
    def register(self, request, **kwargs):
        logging.debug("backend.register")
        logging.debug(kwargs)

        username, email, password = kwargs['email'], kwargs['email'], kwargs['password1']

Debug after invoking them :

2010-07-09 19:24:35,020 DEBUG [email protected]
2010-07-09 19:24:35,020 DEBUG {'password1': u'a', 'email': u'[email protected]'}
2010-07-09 19:24:35,020 DEBUG <registration.backends.default.DefaultBackend object at 0x15c6090>
2010-07-09 19:24:35,021 DEBUG backend.register
2010-07-09 19:24:35,021 DEBUG {}

Why the data could be missing ? Am I doing something wrong ?

@edit for Silent-Ghost

 register() takes exactly 2 arguments (3 given)

 112.  backend = request.session['backend']
 113. logging.debug(backend)
 114. user = backend.register(request, userdata) 

Answer 1

No need to mess with ** in register method. What you want to do is simply pass dictionary to register method:

user = backend.register( request, userdata ) # you need to pass request as definition says

def register( self, request, userdata ): # note lack of **
    logging.debug("backend.register")
    logging.debug( userdata ) # should work as expected

    username, email, password = userdata['email'], userdata['email'], userdata['password1']