diff --git a/django/contrib/auth/forms.py b/django/contrib/auth/forms.py
index beff18c0f2..2d7a7c14d4 100644
--- a/django/contrib/auth/forms.py
+++ b/django/contrib/auth/forms.py
@@ -1,7 +1,5 @@
 from __future__ import unicode_literals
 
-import warnings
-
 from django import forms
 from django.forms.util import flatatt
 from django.template import loader
diff --git a/django/contrib/auth/models.py b/django/contrib/auth/models.py
index 5e3c6451f9..cf3d37e5c3 100644
--- a/django/contrib/auth/models.py
+++ b/django/contrib/auth/models.py
@@ -1,8 +1,6 @@
 from __future__ import unicode_literals
 import re
-import warnings
 
-from django.core.exceptions import ImproperlyConfigured
 from django.core.mail import send_mail
 from django.core import validators
 from django.db import models
@@ -31,10 +29,6 @@ def update_last_login(sender, user, **kwargs):
 user_logged_in.connect(update_last_login)
 
 
-class SiteProfileNotAvailable(Exception):
-    pass
-
-
 class PermissionManager(models.Manager):
     def get_by_natural_key(self, codename, app_label, model):
         return self.get(
diff --git a/django/contrib/auth/tests/test_models.py b/django/contrib/auth/tests/test_models.py
index cd3a13b76d..fa20775a8d 100644
--- a/django/contrib/auth/tests/test_models.py
+++ b/django/contrib/auth/tests/test_models.py
@@ -1,5 +1,5 @@
 from django.contrib.auth import get_user_model
-from django.contrib.auth.models import (Group, User, UserManager)
+from django.contrib.auth.models import Group, User, UserManager
 from django.contrib.auth.tests.utils import skipIfCustomUser
 from django.db.models.signals import post_save
 from django.test import TestCase
diff --git a/django/contrib/sitemaps/views.py b/django/contrib/sitemaps/views.py
index 63551a925b..7a94fb355d 100644
--- a/django/contrib/sitemaps/views.py
+++ b/django/contrib/sitemaps/views.py
@@ -1,4 +1,3 @@
-import warnings
 from functools import wraps
 
 from django.contrib.sites.models import get_current_site
diff --git a/django/shortcuts/__init__.py b/django/shortcuts/__init__.py
index 828b6d2d37..b096efdb44 100644
--- a/django/shortcuts/__init__.py
+++ b/django/shortcuts/__init__.py
@@ -3,8 +3,6 @@ This module collects helper functions and classes that "span" multiple levels
 of MVC. In other words, these functions/classes introduce controlled coupling
 for convenience's sake.
 """
-import warnings
-
 from django.template import loader, RequestContext
 from django.http import HttpResponse, Http404
 from django.http import HttpResponseRedirect, HttpResponsePermanentRedirect
diff --git a/django/test/testcases.py b/django/test/testcases.py
index 4300df2856..53b15158ca 100644
--- a/django/test/testcases.py
+++ b/django/test/testcases.py
@@ -15,7 +15,6 @@ except ImportError:     # Python 2
 import select
 import socket
 import threading
-import warnings
 
 from django.conf import settings
 from django.contrib.staticfiles.handlers import StaticFilesHandler
diff --git a/docs/ref/utils.txt b/docs/ref/utils.txt
index c29c210be7..d7be7a4735 100644
--- a/docs/ref/utils.txt
+++ b/docs/ref/utils.txt
@@ -188,7 +188,7 @@ The functions defined in this module share the following properties:
 =========================
 
 .. module:: django.utils.encoding
-   :synopsis: A series of helper function to manage character encoding.
+   :synopsis: A series of helper functions to manage character encoding.
 
 .. function:: python_2_unicode_compatible
 
diff --git a/tests/.coveragerc b/tests/.coveragerc
index cd7fee3c89..1b4c087f14 100644
--- a/tests/.coveragerc
+++ b/tests/.coveragerc
@@ -1,5 +1,5 @@
 [run]
-omit = */django/contrib/*/tests*,*/django/utils/unittest*,*/django/utils/simplejson*,*/django/utils/importlib.py,*/django/test/_doctest.py,*/django/core/servers/fastcgi.py,*/django/utils/autoreload.py,*/django/utils/dictconfig.py
+omit = */django/contrib/*/tests*,*/django/utils/unittest*,*/django/utils/importlib.py,*/django/test/_doctest.py,*/django/core/servers/fastcgi.py,*/django/utils/autoreload.py,*/django/utils/dictconfig.py
 
 [html]
 directory = coverage_html
diff --git a/tests/test_utils/tests.py b/tests/test_utils/tests.py
index b51ba7bf3b..8c6c15e357 100644
--- a/tests/test_utils/tests.py
+++ b/tests/test_utils/tests.py
@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 from __future__ import absolute_import, unicode_literals
-import warnings
 
 from django.db import connection
 from django.forms import EmailField, IntegerField