INCR-211: run python-modernize and isort (#20432)

* INCR-211:  run python-modernize and isort to support python2 --> python3 transition

* INCR-211: fix pylint errors.

Removed unused module import request and error.
Used import as to avoid too deep a function call.

Altering imports and using suppression of pylint's import error.

* INCR-211: ignore pylint's import error from six module.

* INCR-211: remove unused modules.  Ignore pylint import error from six module.

* INCR-211:  ignore pylint's import error from six module.  Group imports.

* INCR-211:  disable error of 'must be called with literal string'

The specific context for this error means we can disable this.

* INCR-211: change import to satisfy pylint by renaming import

* INCR-211: fix imports so six.unichr works.

openedx/core/djangoapps/user_authn/views/auto_auth.py

@@ -1,4 +1,6 @@
 """ Views related to auto auth. """
+from __future__ import absolute_import
+
 import datetime
 import uuid
 
@@ -6,22 +8,24 @@ from django.conf import settings
 from django.contrib.auth import login as django_login
 from django.contrib.auth.models import User
 from django.core.exceptions import PermissionDenied
-from django.urls import NoReverseMatch, reverse
 from django.core.validators import ValidationError
 from django.http import HttpResponseForbidden
 from django.shortcuts import redirect
 from django.template.context_processors import csrf
+from django.urls import NoReverseMatch, reverse
 from django.utils.translation import ugettext as _
+from opaque_keys.edx.locator import CourseLocator
 
 from lms.djangoapps.verify_student.models import ManualVerification
-from opaque_keys.edx.locator import CourseLocator
 from openedx.core.djangoapps.django_comment_common.models import assign_role
 from openedx.core.djangoapps.user_api.accounts.utils import generate_password
 from openedx.features.course_experience import course_home_url_name
 from student.forms import AccountCreationForm
 from student.helpers import (
     AccountValidationError,
+    authenticate_new_user,
     create_or_set_user_attribute_created_on_site,
+    do_create_account
 )
 from student.models import (
     CourseAccessRole,
@@ -31,7 +35,6 @@ from student.models import (
     anonymous_id_for_user,
     create_comments_service_user
 )
-from student.helpers import authenticate_new_user, do_create_account
 from util.json_request import JsonResponse
 
 

openedx/core/djangoapps/user_authn/views/deprecated.py

@@ -1,4 +1,6 @@
 """ User Authn code for deprecated views. """
+from __future__ import absolute_import
+
 import warnings
 
 from django.conf import settings
@@ -9,20 +11,15 @@ from django.http import HttpResponseForbidden
 from django.shortcuts import redirect
 from django.utils.translation import ugettext as _
 from django.views.decorators.csrf import csrf_exempt, ensure_csrf_cookie
-from six import text_type, iteritems
+from six import iteritems, text_type
 
+import third_party_auth
 from edxmako.shortcuts import render_to_response
-
-from openedx.core.djangoapps.user_authn.views.register import create_account_with_params
-from openedx.core.djangoapps.user_authn.cookies import set_logged_in_cookies
 from openedx.core.djangoapps.site_configuration import helpers as configuration_helpers
 from openedx.core.djangoapps.user_api.config.waffle import PREVENT_AUTH_USER_WRITES, SYSTEM_MAINTENANCE_MSG, waffle
-from student.helpers import (
-    auth_pipeline_urls,
-    get_next_url_for_login_page
-)
-from student.helpers import AccountValidationError
-import third_party_auth
+from openedx.core.djangoapps.user_authn.cookies import set_logged_in_cookies
+from openedx.core.djangoapps.user_authn.views.register import create_account_with_params
+from student.helpers import AccountValidationError, auth_pipeline_urls, get_next_url_for_login_page
 from third_party_auth import pipeline, provider
 from util.json_request import JsonResponse
 

openedx/core/djangoapps/user_authn/views/login.py

@@ -4,32 +4,34 @@ Views for login / logout and associated functionality
 Much of this file was broken out from views.py, previous history can be found there.
 """
 
+from __future__ import absolute_import
+
 import logging
 
 from django.conf import settings
-from django.contrib.auth import authenticate, login as django_login
+from django.contrib.auth import authenticate
+from django.contrib.auth import login as django_login
 from django.contrib.auth.decorators import login_required
 from django.contrib.auth.models import User
-from django.urls import reverse
 from django.http import HttpResponse
 from django.utils.translation import ugettext as _
 from django.views.decorators.csrf import csrf_exempt, ensure_csrf_cookie
 from django.views.decorators.http import require_http_methods
 from ratelimitbackend.exceptions import RateLimitException
 
-from edxmako.shortcuts import render_to_response
-from openedx.core.djangoapps.user_authn.cookies import set_logged_in_cookies, refresh_jwt_cookies
-from openedx.core.djangoapps.user_authn.exceptions import AuthFailedError
-from openedx.core.djangoapps.password_policy import compliance as password_policy_compliance
-from openedx.core.djangoapps.site_configuration import helpers as configuration_helpers
-from openedx.core.djangoapps.util.user_messages import PageLevelMessages
-from openedx.core.djangolib.markup import HTML, Text
-from student.models import LoginFailures
-from student.views import send_reactivation_email_for_user
-from student.forms import send_password_reset_email_for_user
-from track import segment
 import third_party_auth
 from third_party_auth import pipeline, provider
+from edxmako.shortcuts import render_to_response
+from openedx.core.djangoapps.password_policy import compliance as password_policy_compliance
+from openedx.core.djangoapps.site_configuration import helpers as configuration_helpers
+from openedx.core.djangoapps.user_authn.cookies import refresh_jwt_cookies, set_logged_in_cookies
+from openedx.core.djangoapps.user_authn.exceptions import AuthFailedError
+from openedx.core.djangoapps.util.user_messages import PageLevelMessages
+from openedx.core.djangolib.markup import HTML, Text
+from student.forms import send_password_reset_email_for_user
+from student.models import LoginFailures
+from student.views import send_reactivation_email_for_user
+from track import segment
 from util.json_request import JsonResponse
 from util.password_policy_validators import normalize_password
 

openedx/core/djangoapps/user_authn/views/login_form.py

@@ -1,9 +1,12 @@
 """ Login related views """
 
+from __future__ import absolute_import
+
 import json
 import logging
 
-import urlparse
+import six
+import six.moves.urllib.parse  # pylint: disable=import-error
 from django.conf import settings
 from django.contrib import messages
 from django.shortcuts import redirect
@@ -12,29 +15,27 @@ from django.views.decorators.csrf import ensure_csrf_cookie
 from django.views.decorators.http import require_http_methods
 
 from edxmako.shortcuts import render_to_response
-from openedx.core.djangoapps.user_authn.views.deprecated import (
-    register_user as old_register_view, signin_user as old_login_view
-)
 from openedx.core.djangoapps.site_configuration import helpers as configuration_helpers
 from openedx.core.djangoapps.theming.helpers import is_request_in_themed_site
 from openedx.core.djangoapps.user_api.accounts.utils import is_secondary_email_feature_enabled
 from openedx.core.djangoapps.user_api.api import (
     RegistrationFormFactory,
     get_login_session_form,
-    get_password_reset_form,
+    get_password_reset_form
 )
 from openedx.core.djangoapps.user_authn.cookies import are_logged_in_cookies_set
+from openedx.core.djangoapps.user_authn.views.deprecated import register_user as old_register_view
+from openedx.core.djangoapps.user_authn.views.deprecated import signin_user as old_login_view
 from openedx.features.enterprise_support.api import enterprise_customer_for_request
 from openedx.features.enterprise_support.utils import (
     handle_enterprise_cookies_for_logistration,
-    update_logistration_context_for_enterprise,
+    update_logistration_context_for_enterprise
 )
 from student.helpers import get_next_url_for_login_page
 import third_party_auth
 from third_party_auth import pipeline
 from third_party_auth.decorators import xframe_allow_whitelisted
 
-
 log = logging.getLogger(__name__)
 
 
@@ -69,7 +70,7 @@ def login_and_registration_form(request, initial_mode="login"):
     third_party_auth_hint = None
     if '?' in redirect_to:
         try:
-            next_args = urlparse.parse_qs(urlparse.urlparse(redirect_to).query)
+            next_args = six.moves.urllib.parse.parse_qs(six.moves.urllib.parse.urlparse(redirect_to).query)
             provider_id = next_args['tpa_hint'][0]
             tpa_hint_provider = third_party_auth.provider.Registry.get(provider_id=provider_id)
             if tpa_hint_provider:
@@ -239,7 +240,7 @@ def _third_party_auth_context(request, redirect_to, tpa_hint=None):
         for msg in messages.get_messages(request):
             if msg.extra_tags.split()[0] == "social-auth":
                 # msg may or may not be translated. Try translating [again] in case we are able to:
-                context['errorMessage'] = _(unicode(msg))
+                context["errorMessage"] = _(six.text_type(msg))  # pylint: disable=E7610
                 break
 
     return context

openedx/core/djangoapps/user_authn/views/logout.py

@@ -1,14 +1,16 @@
 """ Views related to logout. """
-import urllib
-from urlparse import parse_qs, urlsplit, urlunsplit
+from __future__ import absolute_import
 
 import edx_oauth2_provider
+from six.moves.urllib.parse import parse_qs, urlsplit, urlunsplit  # pylint: disable=import-error
+import six.moves.urllib.parse as parse  # pylint: disable=import-error
 from django.conf import settings
 from django.contrib.auth import logout
 from django.shortcuts import redirect
 from django.utils.http import urlencode
 from django.views.generic import TemplateView
 from provider.oauth2.models import Client
+
 from openedx.core.djangoapps.user_authn.cookies import delete_logged_in_cookies
 from openedx.core.djangoapps.user_authn.utils import is_safe_login_or_logout_redirect
 
@@ -53,7 +55,7 @@ class LogoutView(TemplateView):
         #  >> /courses/course-v1:ARTS+D1+2018_T/course/
         #  to handle this scenario we need to encode our URL using quote_plus and then unquote it again.
         if target_url:
-            target_url = urllib.unquote(urllib.quote_plus(target_url))
+            target_url = parse.unquote(parse.quote_plus(target_url))
 
         if target_url and is_safe_login_or_logout_redirect(self.request, target_url):
             return target_url

openedx/core/djangoapps/user_authn/views/register.py

@@ -2,6 +2,8 @@
 Registration related views.
 """
 
+from __future__ import absolute_import
+
 import datetime
 import json
 import logging
@@ -9,47 +11,36 @@ import logging
 from django.conf import settings
 from django.contrib.auth import login as django_login
 from django.contrib.auth.models import User
-from django.urls import reverse
 from django.core.validators import ValidationError, validate_email
 from django.db import transaction
 from django.dispatch import Signal
+from django.urls import reverse
 from django.utils.translation import get_language
 from django.utils.translation import ugettext as _
-
-# Note that this lives in LMS, so this dependency should be refactored.
-# TODO Have the discussions code subscribe to the REGISTER_USER signal instead.
-from lms.djangoapps.discussion.notification_prefs.views import enable_notifications
 from pytz import UTC
 from requests import HTTPError
 from six import text_type
 from social_core.exceptions import AuthAlreadyAssociated, AuthException
 from social_django import utils as social_utils
 
+import third_party_auth
+# Note that this lives in LMS, so this dependency should be refactored.
+# TODO Have the discussions code subscribe to the REGISTER_USER signal instead.
+from lms.djangoapps.discussion.notification_prefs.views import enable_notifications
 from openedx.core.djangoapps.lang_pref import LANGUAGE_KEY
 from openedx.core.djangoapps.site_configuration import helpers as configuration_helpers
 from openedx.core.djangoapps.user_api import accounts as accounts_settings
 from openedx.core.djangoapps.user_api.accounts.utils import generate_password
 from openedx.core.djangoapps.user_api.preferences import api as preferences_api
-
 from student.forms import AccountCreationForm, get_registration_extension_form
-from student.helpers import (
-    authenticate_new_user,
-    create_or_set_user_attribute_created_on_site,
-    do_create_account,
-)
-from student.models import (
-    RegistrationCookieConfiguration,
-    UserAttribute,
-    create_comments_service_user,
-)
+from student.helpers import authenticate_new_user, create_or_set_user_attribute_created_on_site, do_create_account
+from student.models import RegistrationCookieConfiguration, UserAttribute, create_comments_service_user
 from student.views import compose_and_send_activation_email
-from track import segment
-import third_party_auth
 from third_party_auth import pipeline, provider
 from third_party_auth.saml import SAP_SUCCESSFACTORS_SAML_KEY
+from track import segment
 from util.db import outer_atomic
 
-
 log = logging.getLogger("edx.student")
 AUDIT_LOG = logging.getLogger("audit")
 
@@ -105,7 +96,7 @@ def create_account_with_params(request, params):
     """
     # Copy params so we can modify it; we can't just do dict(params) because if
     # params is request.POST, that results in a dict containing lists of values
-    params = dict(params.items())
+    params = dict(list(params.items()))
 
     # allow to define custom set of required/optional/hidden fields via configuration
     extra_fields = configuration_helpers.get_value(

openedx/core/djangoapps/user_authn/views/tests/test_auto_auth.py

@@ -1,19 +1,25 @@
 """ Tests for auto auth. """
+from __future__ import absolute_import
+
 import json
 
 import ddt
+import six
 from django.conf import settings
 from django.contrib.auth.models import User
 from django.test import TestCase
 from django.test.client import Client
-from mock import patch, Mock
+from mock import Mock, patch
 from opaque_keys.edx.locator import CourseLocator
 
 from openedx.core.djangoapps.django_comment_common.models import (
-    Role, FORUM_ROLE_ADMINISTRATOR, FORUM_ROLE_MODERATOR, FORUM_ROLE_STUDENT
+    FORUM_ROLE_ADMINISTRATOR,
+    FORUM_ROLE_MODERATOR,
+    FORUM_ROLE_STUDENT,
+    Role
 )
 from openedx.core.djangoapps.django_comment_common.utils import seed_permissions_roles
-from student.models import anonymous_id_for_user, CourseAccessRole, CourseEnrollment, UserProfile
+from student.models import CourseAccessRole, CourseEnrollment, UserProfile, anonymous_id_for_user
 from util.testing import UrlResetMixin
 
 
@@ -207,7 +213,7 @@ class AutoAuthEnabledTestCase(AutoAuthTestCase):
         if settings.ROOT_URLCONF == 'lms.urls':
             url_pattern = '/course/'
         else:
-            url_pattern = '/course/{}'.format(unicode(course_key))
+            url_pattern = '/course/{}'.format(six.text_type(course_key))
 
         self.assertTrue(response.url.endswith(url_pattern))
 

openedx/core/djangoapps/user_authn/views/tests/test_login.py

@@ -2,11 +2,14 @@
 """
 Tests for student activation and login
 """
+from __future__ import absolute_import
+
 import json
 import unicodedata
-import unittest
 
 import ddt
+import six
+from six.moves import range
 from django.conf import settings
 from django.contrib.auth.models import User
 from django.core import mail
@@ -74,7 +77,7 @@ class LoginTest(CacheIsolationTestCase):
         self._assert_not_in_audit_log(mock_audit_log, 'info', [u'test@edx.org'])
 
     def test_login_success_unicode_email(self):
-        unicode_email = u'test' + unichr(40960) + u'@edx.org'
+        unicode_email = u'test' + six.unichr(40960) + u'@edx.org'
         self.user.email = unicode_email
         self.user.save()
 
@@ -180,7 +183,7 @@ class LoginTest(CacheIsolationTestCase):
         self._assert_not_in_audit_log(mock_audit_log, 'warning', [u'test'])
 
     def test_login_unicode_email(self):
-        unicode_email = u'test@edx.org' + unichr(40960)
+        unicode_email = u'test@edx.org' + six.unichr(40960)
         response, mock_audit_log = self._login_response(
             unicode_email,
             'test_password',
@@ -189,7 +192,7 @@ class LoginTest(CacheIsolationTestCase):
         self._assert_audit_log(mock_audit_log, 'warning', [u'Login failed', unicode_email])
 
     def test_login_unicode_password(self):
-        unicode_password = u'test_password' + unichr(1972)
+        unicode_password = u'test_password' + six.unichr(1972)
         response, mock_audit_log = self._login_response(
             'test@edx.org',
             unicode_password,
@@ -271,7 +274,7 @@ class LoginTest(CacheIsolationTestCase):
     def test_login_ratelimited_success(self):
         # Try (and fail) logging in with fewer attempts than the limit of 30
         # and verify that you can still successfully log in afterwards.
-        for i in xrange(20):
+        for i in range(20):
             password = u'test_password{0}'.format(i)
             response, _audit_log = self._login_response('test@edx.org', password)
             self._assert_response(response, success=False)
@@ -282,7 +285,7 @@ class LoginTest(CacheIsolationTestCase):
     def test_login_ratelimited(self):
         # try logging in 30 times, the default limit in the number of failed
         # login attempts in one 5 minute period before the rate gets limited
-        for i in xrange(30):
+        for i in range(30):
             password = u'test_password{0}'.format(i)
             self._login_response('test@edx.org', password)
         # check to see if this response indicates that this was ratelimited
@@ -545,7 +548,7 @@ class LoginTest(CacheIsolationTestCase):
 
         if value is not None:
             msg = (u"'%s' did not contain '%s'" %
-                   (unicode(response_dict['value']), unicode(value)))
+                   (six.text_type(response_dict['value']), six.text_type(value)))
             self.assertIn(value, response_dict['value'], msg)
 
     def _assert_audit_log(self, mock_audit_log, level, log_strings):

openedx/core/djangoapps/user_authn/views/tests/test_login_registration_forms.py

@@ -1,8 +1,13 @@
 """Tests for the login and registration form rendering. """
+from __future__ import absolute_import
+
 import unittest
-import urllib
 
 import ddt
+import six
+import six.moves.urllib.error  # pylint: disable=import-error
+import six.moves.urllib.parse  # pylint: disable=import-error
+import six.moves.urllib.request  # pylint: disable=import-error
 from django.conf import settings
 from django.urls import reverse
 from mock import patch
@@ -26,13 +31,13 @@ def _third_party_login_url(backend_name, auth_entry, redirect_url=None):
 
     return u"{url}?{params}".format(
         url=reverse("social:begin", kwargs={"backend": backend_name}),
-        params=urllib.urlencode(params)
+        params=six.moves.urllib.parse.urlencode(params)
     )
 
 
 def _finish_auth_url(params):
     """ Construct the URL that follows login/registration if we are doing auto-enrollment """
-    return u"{}?{}".format(reverse('finish_auth'), urllib.urlencode(params))
+    return u"{}?{}".format(reverse('finish_auth'), six.moves.urllib.parse.urlencode(params))
 
 
 @ddt.ddt
@@ -55,7 +60,7 @@ class LoginFormTest(ThirdPartyAuthTestMixin, UrlResetMixin, SharedModuleStoreTes
         super(LoginFormTest, self).setUp()
 
         self.url = reverse("signin_user")
-        self.course_id = unicode(self.course.id)
+        self.course_id = six.text_type(self.course.id)
         self.courseware_url = reverse("courseware", args=[self.course_id])
         self.configure_google_provider(enabled=True, visible=True)
         self.configure_facebook_provider(enabled=True, visible=True)
@@ -150,7 +155,7 @@ class LoginFormTest(ThirdPartyAuthTestMixin, UrlResetMixin, SharedModuleStoreTes
         # Verify that the login link preserves the querystring params
         login_link = u"{url}?{params}".format(
             url=reverse('signin_user'),
-            params=urllib.urlencode([('next', post_login_handler)])
+            params=six.moves.urllib.parse.urlencode([('next', post_login_handler)])
         )
         self.assertContains(response, login_link)
 
@@ -172,7 +177,7 @@ class RegisterFormTest(ThirdPartyAuthTestMixin, UrlResetMixin, SharedModuleStore
         super(RegisterFormTest, self).setUp()
 
         self.url = reverse("register_user")
-        self.course_id = unicode(self.course.id)
+        self.course_id = six.text_type(self.course.id)
         self.configure_google_provider(enabled=True, visible=True)
         self.configure_facebook_provider(enabled=True, visible=True)
 
@@ -226,6 +231,6 @@ class RegisterFormTest(ThirdPartyAuthTestMixin, UrlResetMixin, SharedModuleStore
         # Verify that the login link preserves the querystring params
         login_link = u"{url}?{params}".format(
             url=reverse('signin_user'),
-            params=urllib.urlencode([('next', post_login_handler)])
+            params=six.moves.urllib.parse.urlencode([('next', post_login_handler)])
         )
         self.assertContains(response, login_link)

openedx/core/djangoapps/user_authn/views/tests/test_logout.py

@@ -1,20 +1,20 @@
 """
 Tests for logout
 """
+from __future__ import absolute_import
+
 import unittest
-import urllib
 
 import ddt
+import six.moves.urllib.parse as parse  # pylint: disable=import-error
 from django.conf import settings
 from django.test import TestCase
 from django.test.utils import override_settings
 from django.urls import reverse
-from mock import patch
 from edx_oauth2_provider.constants import AUTHORIZED_CLIENTS_SESSION_KEY
-from edx_oauth2_provider.tests.factories import (
-    ClientFactory,
-    TrustedClientFactory
-)
+from edx_oauth2_provider.tests.factories import ClientFactory, TrustedClientFactory
+from mock import patch
+
 from student.tests.factories import UserFactory
 
 
@@ -81,7 +81,7 @@ class LogoutTests(TestCase):
         )
         response = self.client.get(url, HTTP_HOST=host)
         expected = {
-            'target': urllib.unquote(redirect_url),
+            'target': parse.unquote(redirect_url),
         }
         self.assertDictContainsSubset(expected, response.context_data)
 

openedx/core/djangoapps/user_authn/views/tests/test_register.py

@@ -1,33 +1,39 @@
 # -*- coding: utf-8 -*-
 """Tests for account creation"""
+from __future__ import absolute_import
+
 import json
+import unicodedata
 import unittest
 from datetime import datetime
-import unicodedata
 
 import ddt
 import mock
 import pytz
 from django.conf import settings
+from django.contrib.auth.hashers import make_password
 from django.contrib.auth.models import AnonymousUser, User
-from django.urls import reverse
 from django.test import TestCase, TransactionTestCase
 from django.test.client import RequestFactory
 from django.test.utils import override_settings
-from django.contrib.auth.hashers import make_password
+from django.urls import reverse
 
 from lms.djangoapps.discussion.notification_prefs import NOTIFICATION_PREF_KEY
 from openedx.core.djangoapps.django_comment_common.models import ForumsConfig
 from openedx.core.djangoapps.lang_pref import LANGUAGE_KEY
 from openedx.core.djangoapps.site_configuration.tests.mixins import SiteMixin
 from openedx.core.djangoapps.user_api.accounts import (
-    USERNAME_BAD_LENGTH_MSG, USERNAME_INVALID_CHARS_ASCII, USERNAME_INVALID_CHARS_UNICODE
+    USERNAME_BAD_LENGTH_MSG,
+    USERNAME_INVALID_CHARS_ASCII,
+    USERNAME_INVALID_CHARS_UNICODE
 )
 from openedx.core.djangoapps.user_api.config.waffle import PREVENT_AUTH_USER_WRITES, waffle
 from openedx.core.djangoapps.user_api.preferences.api import get_user_preference
 from openedx.core.djangoapps.user_authn.views.register import (
-    REGISTRATION_AFFILIATE_ID, REGISTRATION_UTM_CREATED_AT, REGISTRATION_UTM_PARAMETERS,
-    _skip_activation_email,
+    REGISTRATION_AFFILIATE_ID,
+    REGISTRATION_UTM_CREATED_AT,
+    REGISTRATION_UTM_PARAMETERS,
+    _skip_activation_email
 )
 from student.models import UserAttribute
 from student.tests.factories import UserFactory

openedx/core/djangoapps/user_authn/views/tests/test_views.py

@@ -1,11 +1,12 @@
 # -*- coding: utf-8 -*-
 """ Tests for user authn views. """
 
-from http.cookies import SimpleCookie
+from __future__ import absolute_import
+
 import logging
 import re
+from http.cookies import SimpleCookie
 from unittest import skipUnless
-from urllib import urlencode
 
 import ddt
 import mock
@@ -17,27 +18,29 @@ from django.contrib.messages.middleware import MessageMiddleware
 from django.contrib.sessions.middleware import SessionMiddleware
 from django.core import mail
 from django.core.files.uploadedfile import SimpleUploadedFile
-from django.urls import reverse
 from django.test import TestCase
 from django.test.client import RequestFactory
 from django.test.utils import override_settings
+from django.urls import reverse
 from django.utils.translation import ugettext as _
 from edx_oauth2_provider.tests.factories import AccessTokenFactory, ClientFactory, RefreshTokenFactory
 from oauth2_provider.models import AccessToken as dot_access_token
 from oauth2_provider.models import RefreshToken as dot_refresh_token
 from provider.oauth2.models import AccessToken as dop_access_token
 from provider.oauth2.models import RefreshToken as dop_refresh_token
+from six.moves import range
+from six.moves.urllib.parse import urlencode  # pylint: disable=import-error
 from testfixtures import LogCapture
 from waffle.models import Switch
 
 from course_modes.models import CourseMode
-from openedx.core.djangoapps.user_authn.views.login_form import login_and_registration_form
 from openedx.core.djangoapps.oauth_dispatch.tests import factories as dot_factories
 from openedx.core.djangoapps.site_configuration.tests.mixins import SiteMixin
 from openedx.core.djangoapps.theming.tests.test_util import with_comprehensive_theme_context
 from openedx.core.djangoapps.user_api.accounts.api import activate_account, create_account
-from openedx.core.djangoapps.user_api.errors import UserAPIInternalError
 from openedx.core.djangoapps.user_api.accounts.utils import ENABLE_SECONDARY_EMAIL_FEATURE_SWITCH
+from openedx.core.djangoapps.user_api.errors import UserAPIInternalError
+from openedx.core.djangoapps.user_authn.views.login_form import login_and_registration_form
 from openedx.core.djangolib.js_utils import dump_js_escaped_json
 from openedx.core.djangolib.markup import HTML, Text
 from openedx.core.djangolib.testing.utils import CacheIsolationTestCase, skip_unless_lms
@@ -241,7 +244,7 @@ class UserAccountUpdateTest(CacheIsolationTestCase, UrlResetMixin):
         self.client.logout()
 
         # Make many consecutive bad requests in an attempt to trigger the rate limiter
-        for __ in xrange(self.INVALID_ATTEMPTS):
+        for __ in range(self.INVALID_ATTEMPTS):
             self._change_password(email=self.NEW_EMAIL)
 
         response = self._change_password(email=self.NEW_EMAIL)