add a registered group in geonode

def add_user_in_registered_group(user):
    from geonode.groups.models import GroupProfile
    from geonode.people.models import Profile
    try:
        gp = GroupProfile.objects.get(slug='registered')
    except GroupProfile.DoesNotExist:
        gp = GroupProfile.objects.create(
            title=_('Registered GeoNode Users'),
            slug='registered',
            description=_('Group containg all of the GeoNode users'),
            access="public",
        )
        # assign all existing users to this group
        for profile in Profile.objects.all():
            if profile.username != 'AnonymousUser':
                gp.join(profile)
        return
    # assign user to group
    gp.join(user)


def profile_post_save(instance, sender, **kwargs):
    """Make sure the user belongs by default to the anonymous group.
    This will make sure that anonymous permissions will be granted to the new users."""
    from django.contrib.auth.models import Group
    anon_group, created = Group.objects.get_or_create(name='anonymous')
    instance.groups.add(anon_group)
    # keep in sync Profile email address with Account email address
    if instance.email not in [u'', '', None] and not kwargs.get('raw', False):
        EmailAddress.objects.filter(user=instance, primary=True).update(email=instance.email)
    # check if profile is in registered users group
    add_user_in_registered_group(instance)