Used pkgutil to get list of backend modules

import os

import pkgutil

from threading import local

from django.conf import settings

        # listing all possible (built-in) database backends.

        backend_dir = os.path.join(os.path.dirname(__file__), 'backends')

        try:

            builtin_backends = [f for f in os.listdir(backend_dir)

                    if os.path.isdir(os.path.join(backend_dir, f))

                    and not (f.startswith('.') or f in ('__pycache__', 'dummy'))]

            builtin_backends = [

                name for _, name, ispkg in pkgutil.iter_modules([backend_dir])

                if ispkg and name != 'dummy']

        except EnvironmentError:

            builtin_backends = []

        if backend_name not in ['django.db.backends.%s' % b for b in