Fixed potential circular import problem.

import datetime

from django.conf import settings

from django.contrib.sessions.models import Session

from django.contrib.sessions.backends.base import SessionBase, CreateError

from django.core.exceptions import SuspiciousOperation

from django.db import IntegrityError, transaction, router

from django.utils.encoding import force_unicode

class SessionStore(SessionBase):

    """

    Implements database session store.

            Session.objects.get(session_key=session_key).delete()

        except Session.DoesNotExist:

            pass

# At bottom to avoid circular import

from django.contrib.sessions.models import Session

from django.db import models

from django.utils.translation import ugettext_lazy as _

class SessionManager(models.Manager):

    def encode(self, session_dict):

        """

    def get_decoded(self):

        return SessionStore().decode(self.session_data)

# At bottom to avoid circular import

from django.contrib.sessions.backends.db import SessionStore