diff --git a/demo/demo/urls.py b/demo/demo/urls.py
index 787c6e9..4f63ba1 100644
--- a/demo/demo/urls.py
+++ b/demo/demo/urls.py
@@ -1,7 +1,6 @@
 from django.conf.urls import include, url
 from django.contrib import admin
-from django.views.generic import TemplateView, RedirectView
-
+from django.views.generic import RedirectView, TemplateView
 from rest_framework_swagger.views import get_swagger_view
 
 urlpatterns = [
diff --git a/demo/demo/wsgi.py b/demo/demo/wsgi.py
index ef48754..863501d 100644
--- a/demo/demo/wsgi.py
+++ b/demo/demo/wsgi.py
@@ -8,7 +8,9 @@ https://docs.djangoproject.com/en/1.7/howto/deployment/wsgi/
 """
 
 import os
-os.environ.setdefault("DJANGO_SETTINGS_MODULE", "demo.settings")
 
 from django.core.wsgi import get_wsgi_application
+
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "demo.settings")
+
 application = get_wsgi_application()
diff --git a/dj_rest_auth/app_settings.py b/dj_rest_auth/app_settings.py
index 7f8094f..d89202d 100644
--- a/dj_rest_auth/app_settings.py
+++ b/dj_rest_auth/app_settings.py
@@ -1,34 +1,36 @@
+from dj_rest_auth.serializers import JWTSerializer as DefaultJWTSerializer
+from dj_rest_auth.serializers import LoginSerializer as DefaultLoginSerializer
+from dj_rest_auth.serializers import \
+    PasswordChangeSerializer as DefaultPasswordChangeSerializer
+from dj_rest_auth.serializers import \
+    PasswordResetConfirmSerializer as DefaultPasswordResetConfirmSerializer
+from dj_rest_auth.serializers import \
+    PasswordResetSerializer as DefaultPasswordResetSerializer
+from dj_rest_auth.serializers import TokenSerializer as DefaultTokenSerializer
+from dj_rest_auth.serializers import \
+    UserDetailsSerializer as DefaultUserDetailsSerializer
 from django.conf import settings
 
-from dj_rest_auth.serializers import (
-    TokenSerializer as DefaultTokenSerializer,
-    JWTSerializer as DefaultJWTSerializer,
-    UserDetailsSerializer as DefaultUserDetailsSerializer,
-    LoginSerializer as DefaultLoginSerializer,
-    PasswordResetSerializer as DefaultPasswordResetSerializer,
-    PasswordResetConfirmSerializer as DefaultPasswordResetConfirmSerializer,
-    PasswordChangeSerializer as DefaultPasswordChangeSerializer)
-from .utils import default_create_token
+from .utils import default_create_token, import_callable
 
-create_token = getattr(settings, 'REST_AUTH_TOKEN_CREATOR', default_create_token)
+create_token = import_callable(getattr(settings, 'REST_AUTH_TOKEN_CREATOR', default_create_token))
 
 serializers = getattr(settings, 'REST_AUTH_SERIALIZERS', {})
 
-TokenSerializer = serializers.get('TOKEN_SERIALIZER', DefaultTokenSerializer)
+TokenSerializer = import_callable(serializers.get('TOKEN_SERIALIZER', DefaultTokenSerializer))
 
-JWTSerializer = serializers.get('JWT_SERIALIZER', DefaultJWTSerializer)
+JWTSerializer = import_callable(serializers.get('JWT_SERIALIZER', DefaultJWTSerializer))
 
-UserDetailsSerializer = serializers.get('USER_DETAILS_SERIALIZER', DefaultUserDetailsSerializer)
+UserDetailsSerializer = import_callable(serializers.get('USER_DETAILS_SERIALIZER', DefaultUserDetailsSerializer))
 
-LoginSerializer = serializers.get('LOGIN_SERIALIZER', DefaultLoginSerializer)
+LoginSerializer = import_callable(serializers.get('LOGIN_SERIALIZER', DefaultLoginSerializer))
 
-PasswordResetSerializer = serializers.get(
-        'PASSWORD_RESET_SERIALIZER',
-        DefaultPasswordResetSerializer
-    )
+PasswordResetSerializer = import_callable(serializers.get(
+    'PASSWORD_RESET_SERIALIZER', DefaultPasswordResetSerializer
+))
 
 PasswordResetConfirmSerializer = serializers.get(
     'PASSWORD_RESET_CONFIRM_SERIALIZER', DefaultPasswordResetConfirmSerializer
 )
 
-PasswordChangeSerializer = serializers.get('PASSWORD_CHANGE_SERIALIZER', DefaultPasswordChangeSerializer)
+PasswordChangeSerializer = import_callable(serializers.get('PASSWORD_CHANGE_SERIALIZER', DefaultPasswordChangeSerializer))
diff --git a/dj_rest_auth/models.py b/dj_rest_auth/models.py
index 5f690da..654c0ae 100644
--- a/dj_rest_auth/models.py
+++ b/dj_rest_auth/models.py
@@ -1,8 +1,6 @@
 from django.conf import settings
-
 from rest_framework.authtoken.models import Token as DefaultTokenModel
 
-
 # Register your models here.
 
 TokenModel = getattr(settings, 'REST_AUTH_TOKEN_MODEL', DefaultTokenModel)
diff --git a/dj_rest_auth/registration/app_settings.py b/dj_rest_auth/registration/app_settings.py
index fdeae83..bbc7075 100644
--- a/dj_rest_auth/registration/app_settings.py
+++ b/dj_rest_auth/registration/app_settings.py
@@ -1,14 +1,13 @@
-from django.conf import settings
-
-from rest_framework.permissions import AllowAny
-from dj_rest_auth.registration.serializers import (
+from dj_rest_auth.registration.serializers import \
     RegisterSerializer as DefaultRegisterSerializer
-)
+from django.conf import settings
+from rest_framework.permissions import AllowAny
 
+from ..utils import import_callable
 
 serializers = getattr(settings, 'REST_AUTH_REGISTER_SERIALIZERS', {})
 
-RegisterSerializer = serializers.get('REGISTER_SERIALIZER', DefaultRegisterSerializer)
+RegisterSerializer = import_callable(serializers.get('REGISTER_SERIALIZER', DefaultRegisterSerializer))
 
 
 def register_permission_classes():
diff --git a/dj_rest_auth/registration/serializers.py b/dj_rest_auth/registration/serializers.py
index 4f99c18..fc7c92b 100644
--- a/dj_rest_auth/registration/serializers.py
+++ b/dj_rest_auth/registration/serializers.py
@@ -1,6 +1,8 @@
+from django.contrib.auth import get_user_model
 from django.http import HttpRequest
 from django.utils.translation import ugettext_lazy as _
-from django.contrib.auth import get_user_model
+from requests.exceptions import HTTPError
+from rest_framework import serializers
 
 try:
     from allauth.account import app_settings as allauth_settings
@@ -14,8 +16,6 @@ try:
 except ImportError:
     raise ImportError("allauth needs to be added to INSTALLED_APPS.")
 
-from rest_framework import serializers
-from requests.exceptions import HTTPError
 
 
 class SocialAccountSerializer(serializers.ModelSerializer):
diff --git a/dj_rest_auth/registration/urls.py b/dj_rest_auth/registration/urls.py
index 1004695..c42cec6 100644
--- a/dj_rest_auth/registration/urls.py
+++ b/dj_rest_auth/registration/urls.py
@@ -1,5 +1,5 @@
-from django.views.generic import TemplateView
 from django.conf.urls import url
+from django.views.generic import TemplateView
 
 from .views import RegisterView, VerifyEmailView
 
diff --git a/dj_rest_auth/registration/views.py b/dj_rest_auth/registration/views.py
index f8d1120..81ed1ea 100644
--- a/dj_rest_auth/registration/views.py
+++ b/dj_rest_auth/registration/views.py
@@ -1,34 +1,30 @@
+from allauth.account import app_settings as allauth_settings
+from allauth.account.adapter import get_adapter
+from allauth.account.utils import complete_signup
+from allauth.account.views import ConfirmEmailView
+from allauth.socialaccount import signals
+from allauth.socialaccount.adapter import get_adapter as get_social_adapter
+from allauth.socialaccount.models import SocialAccount
+from dj_rest_auth.app_settings import (JWTSerializer, TokenSerializer,
+                                       create_token)
+from dj_rest_auth.models import TokenModel
+from dj_rest_auth.registration.serializers import (SocialAccountSerializer,
+                                                   SocialConnectSerializer,
+                                                   SocialLoginSerializer,
+                                                   VerifyEmailSerializer)
+from dj_rest_auth.utils import jwt_encode
+from dj_rest_auth.views import LoginView
 from django.conf import settings
 from django.utils.decorators import method_decorator
 from django.utils.translation import ugettext_lazy as _
 from django.views.decorators.debug import sensitive_post_parameters
-
-from rest_framework.views import APIView
-from rest_framework.response import Response
-from rest_framework.permissions import (AllowAny,
-                                        IsAuthenticated)
-from rest_framework.generics import CreateAPIView, ListAPIView, GenericAPIView
-from rest_framework.exceptions import NotFound
 from rest_framework import status
+from rest_framework.exceptions import NotFound
+from rest_framework.generics import CreateAPIView, GenericAPIView, ListAPIView
+from rest_framework.permissions import AllowAny, IsAuthenticated
+from rest_framework.response import Response
+from rest_framework.views import APIView
 
-from allauth.account.adapter import get_adapter
-from allauth.account.views import ConfirmEmailView
-from allauth.account.utils import complete_signup
-from allauth.account import app_settings as allauth_settings
-from allauth.socialaccount import signals
-from allauth.socialaccount.adapter import get_adapter as get_social_adapter
-from allauth.socialaccount.models import SocialAccount
-
-from dj_rest_auth.app_settings import (TokenSerializer,
-                                    JWTSerializer,
-                                    create_token)
-from dj_rest_auth.models import TokenModel
-from dj_rest_auth.registration.serializers import (VerifyEmailSerializer,
-                                                SocialLoginSerializer,
-                                                SocialAccountSerializer,
-                                                SocialConnectSerializer)
-from dj_rest_auth.utils import jwt_encode
-from dj_rest_auth.views import LoginView
 from .app_settings import RegisterSerializer, register_permission_classes
 
 sensitive_post_parameters_m = method_decorator(
diff --git a/dj_rest_auth/serializers.py b/dj_rest_auth/serializers.py
index da8fef7..07783da 100644
--- a/dj_rest_auth/serializers.py
+++ b/dj_rest_auth/serializers.py
@@ -1,12 +1,11 @@
-from django.contrib.auth import get_user_model, authenticate
 from django.conf import settings
+from django.contrib.auth import authenticate, get_user_model
 from django.contrib.auth.forms import PasswordResetForm, SetPasswordForm
 from django.contrib.auth.tokens import default_token_generator
+from django.utils.encoding import force_text
 from django.utils.http import urlsafe_base64_decode as uid_decoder
 from django.utils.translation import ugettext_lazy as _
-from django.utils.encoding import force_text
-
-from rest_framework import serializers, exceptions
+from rest_framework import exceptions, serializers
 from rest_framework.exceptions import ValidationError
 
 from .models import TokenModel
diff --git a/dj_rest_auth/social_serializers.py b/dj_rest_auth/social_serializers.py
index 6f8a449..60b0c2c 100644
--- a/dj_rest_auth/social_serializers.py
+++ b/dj_rest_auth/social_serializers.py
@@ -1,6 +1,7 @@
 from django.conf import settings
 from django.http import HttpRequest
 from rest_framework import serializers
+
 # Import is needed only if we are using social login, in which
 # case the allauth.socialaccount will be declared
 if 'allauth.socialaccount' in settings.INSTALLED_APPS:
diff --git a/dj_rest_auth/tests/mixins.py b/dj_rest_auth/tests/mixins.py
index 30b3d58..06d776d 100644
--- a/dj_rest_auth/tests/mixins.py
+++ b/dj_rest_auth/tests/mixins.py
@@ -1,11 +1,9 @@
 import json
 
 from django.conf import settings
-from django.test.client import Client, MULTIPART_CONTENT
+from django.test.client import MULTIPART_CONTENT, Client
 from django.utils.encoding import force_text
-
-from rest_framework import status
-from rest_framework import permissions
+from rest_framework import permissions, status
 
 try:
     from django.urls import reverse
diff --git a/dj_rest_auth/tests/settings.py b/dj_rest_auth/tests/settings.py
index f683ce0..d18f41e 100644
--- a/dj_rest_auth/tests/settings.py
+++ b/dj_rest_auth/tests/settings.py
@@ -1,6 +1,6 @@
+import logging
 import os
 import sys
-import logging
 
 PROJECT_ROOT = os.path.abspath(os.path.split(os.path.split(__file__)[0])[0])
 
diff --git a/dj_rest_auth/tests/test_api.py b/dj_rest_auth/tests/test_api.py
index b6d84f2..585b38d 100644
--- a/dj_rest_auth/tests/test_api.py
+++ b/dj_rest_auth/tests/test_api.py
@@ -1,17 +1,15 @@
-from django.test import TestCase, override_settings
+from allauth.account import app_settings as account_app_settings
+from dj_rest_auth.registration.app_settings import register_permission_classes
+from dj_rest_auth.registration.views import RegisterView
+from django.conf import settings
 from django.contrib.auth import get_user_model
 from django.core import mail
-from django.conf import settings
+from django.test import TestCase, override_settings
 from django.utils.encoding import force_text
-
-from allauth.account import app_settings as account_app_settings
 from rest_framework import status
 from rest_framework.test import APIRequestFactory
 
-from dj_rest_auth.registration.views import RegisterView
-from dj_rest_auth.registration.app_settings import register_permission_classes
-
-from .mixins import TestsMixin, CustomPermissionClass
+from .mixins import CustomPermissionClass, TestsMixin
 
 try:
     from django.urls import reverse
diff --git a/dj_rest_auth/tests/test_social.py b/dj_rest_auth/tests/test_social.py
index 830e631..47c8d93 100644
--- a/dj_rest_auth/tests/test_social.py
+++ b/dj_rest_auth/tests/test_social.py
@@ -1,22 +1,23 @@
 import json
 
-from django.test import TestCase
+import responses
+from allauth.socialaccount.models import SocialApp
+from allauth.socialaccount.providers.facebook.provider import GRAPH_API_URL
 from django.contrib.auth import get_user_model
-from django.test.utils import override_settings
 from django.contrib.sites.models import Site
+from django.test import TestCase
+from django.test.utils import override_settings
+from rest_framework import status
+
+from .mixins import TestsMixin
 
 try:
     from django.urls import reverse
 except ImportError:
     from django.core.urlresolvers import reverse
 
-from allauth.socialaccount.models import SocialApp
-from allauth.socialaccount.providers.facebook.provider import GRAPH_API_URL
-import responses
 
-from rest_framework import status
 
-from .mixins import TestsMixin
 
 
 @override_settings(ROOT_URLCONF="tests.urls")
diff --git a/dj_rest_auth/tests/urls.py b/dj_rest_auth/tests/urls.py
index 5aa37c1..be199a5 100644
--- a/dj_rest_auth/tests/urls.py
+++ b/dj_rest_auth/tests/urls.py
@@ -1,20 +1,18 @@
-from django.conf.urls import url, include
-from django.views.generic import TemplateView
-from . import django_urls
-
-from allauth.socialaccount.providers.facebook.views import FacebookOAuth2Adapter
+from allauth.socialaccount.providers.facebook.views import \
+    FacebookOAuth2Adapter
 from allauth.socialaccount.providers.twitter.views import TwitterOAuthAdapter
-
+from dj_rest_auth.registration.views import (SocialAccountDisconnectView,
+                                             SocialAccountListView,
+                                             SocialConnectView,
+                                             SocialLoginView)
+from dj_rest_auth.social_serializers import (TwitterConnectSerializer,
+                                             TwitterLoginSerializer)
+from dj_rest_auth.urls import urlpatterns
+from django.conf.urls import include, url
+from django.views.generic import TemplateView
 from rest_framework.decorators import api_view
 
-from dj_rest_auth.urls import urlpatterns
-from dj_rest_auth.registration.views import (
-    SocialLoginView, SocialConnectView, SocialAccountListView,
-    SocialAccountDisconnectView
-)
-from dj_rest_auth.social_serializers import (
-    TwitterLoginSerializer, TwitterConnectSerializer
-)
+from . import django_urls
 
 
 class FacebookLogin(SocialLoginView):
diff --git a/dj_rest_auth/urls.py b/dj_rest_auth/urls.py
index 6664722..d3bfc42 100644
--- a/dj_rest_auth/urls.py
+++ b/dj_rest_auth/urls.py
@@ -1,10 +1,8 @@
+from dj_rest_auth.views import (LoginView, LogoutView, PasswordChangeView,
+                                PasswordResetConfirmView, PasswordResetView,
+                                UserDetailsView)
 from django.conf.urls import url
 
-from dj_rest_auth.views import (
-    LoginView, LogoutView, UserDetailsView, PasswordChangeView,
-    PasswordResetView, PasswordResetConfirmView
-)
-
 urlpatterns = [
     # URLs that do not require a session or valid token
     url(r'^password/reset/$', PasswordResetView.as_view(),
diff --git a/dj_rest_auth/utils.py b/dj_rest_auth/utils.py
index b69dae0..b4858c8 100644
--- a/dj_rest_auth/utils.py
+++ b/dj_rest_auth/utils.py
@@ -1,3 +1,14 @@
+from importlib import import_module
+
+
+def import_callable(path_or_callable):
+    if hasattr(path_or_callable, '__call__'):
+        return path_or_callable
+    else:
+        assert isinstance(path_or_callable, str)
+        package, attr = path_or_callable.rsplit('.', 1)
+        return getattr(import_module(package), attr)
+
 
 def default_create_token(token_model, user, serializer):
     token, _ = token_model.objects.get_or_create(user=user)
diff --git a/dj_rest_auth/views.py b/dj_rest_auth/views.py
index 0a27f8e..b3b8f22 100644
--- a/dj_rest_auth/views.py
+++ b/dj_rest_auth/views.py
@@ -1,25 +1,22 @@
-from django.contrib.auth import (
-    login as django_login,
-    logout as django_logout
-)
 from django.conf import settings
 from django.contrib.auth import get_user_model
+from django.contrib.auth import login as django_login
+from django.contrib.auth import logout as django_logout
 from django.core.exceptions import ObjectDoesNotExist
 from django.utils.decorators import method_decorator
 from django.utils.translation import ugettext_lazy as _
 from django.views.decorators.debug import sensitive_post_parameters
-
 from rest_framework import status
-from rest_framework.views import APIView
-from rest_framework.response import Response
 from rest_framework.generics import GenericAPIView, RetrieveUpdateAPIView
-from rest_framework.permissions import IsAuthenticated, AllowAny
+from rest_framework.permissions import AllowAny, IsAuthenticated
+from rest_framework.response import Response
+from rest_framework.views import APIView
 
-from .app_settings import (
-    TokenSerializer, UserDetailsSerializer, LoginSerializer,
-    PasswordResetSerializer, PasswordResetConfirmSerializer,
-    PasswordChangeSerializer, JWTSerializer, create_token
-)
+from .app_settings import (JWTSerializer, LoginSerializer,
+                           PasswordChangeSerializer,
+                           PasswordResetConfirmSerializer,
+                           PasswordResetSerializer, TokenSerializer,
+                           UserDetailsSerializer, create_token)
 from .models import TokenModel
 from .utils import jwt_encode
 
diff --git a/docs/conf.py b/docs/conf.py
index dd54bb6..7730562 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -12,8 +12,8 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-import sys
 import os
+import sys
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
diff --git a/runtests.py b/runtests.py
index 04dfa7c..3cb605b 100644
--- a/runtests.py
+++ b/runtests.py
@@ -3,13 +3,14 @@
 import os
 import sys
 
+import django
+from django.conf import settings
+from django.test.utils import get_runner
+
 os.environ['DJANGO_SETTINGS_MODULE'] = 'dj_rest_auth.tests.settings'
 test_dir = os.path.join(os.path.dirname(__file__), 'dj_rest_auth')
 sys.path.insert(0, test_dir)
 
-import django
-from django.test.utils import get_runner
-from django.conf import settings
 
 
 def runtests():
diff --git a/setup.py b/setup.py
index b00ff9e..4bbfac8 100644
--- a/setup.py
+++ b/setup.py
@@ -1,8 +1,8 @@
 #!/usr/bin/env python
 
 import os
-from setuptools import setup, find_packages
 
+from setuptools import find_packages, setup
 
 here = os.path.dirname(os.path.abspath(__file__))
 f = open(os.path.join(here, 'README.md'))
@@ -12,7 +12,7 @@ f.close()
 
 setup(
     name='dj-rest-auth',
-    version='0.1.2',
+    version='0.1.3',
     author='iMerica',
     author_email='imichael@pm.me',
     url='http://github.com/iMerica/dj-rest-auth',