Moved import at proper place in contrib.sites

import string

from django.core.exceptions import ImproperlyConfigured, ValidationError

from django.db import models

from django.db.models.signals import pre_save, pre_delete

from django.utils.translation import ugettext_lazy as _

from django.utils.encoding import python_2_unicode_compatible

from django.core.exceptions import ValidationError

SITE_CACHE = {}

        try:

            sid = settings.SITE_ID

        except AttributeError:

            from django.core.exceptions import ImproperlyConfigured

            raise ImproperlyConfigured("You're using the Django \"sites framework\" without having set the SITE_ID setting. Create a site in your database and set the SITE_ID setting to fix this error.")

            raise ImproperlyConfigured(

                "You're using the Django \"sites framework\" without having "

                "set the SITE_ID setting. Create a site in your database and "

                "set the SITE_ID setting to fix this error.")

        try:

            current_site = SITE_CACHE[sid]

        except KeyError: