Removed unused imports.

from django.conf import settings

from django.core.exceptions import ImproperlyConfigured

from django.db.backends.sqlite3.base import (

    _sqlite_extract, _sqlite_date_trunc, _sqlite_regexp, _sqlite_format_dtdelta,

    connection_created, Database, DatabaseWrapper as SQLiteDatabaseWrapper,

    SQLiteCursorWrapper)

from django.db.backends.sqlite3.base import (Database,

    DatabaseWrapper as SQLiteDatabaseWrapper, SQLiteCursorWrapper)

from django.contrib.gis.db.backends.spatialite.client import SpatiaLiteClient

from django.contrib.gis.db.backends.spatialite.creation import SpatiaLiteCreation

from django.contrib.gis.db.backends.spatialite.introspection import SpatiaLiteIntrospection