Don't inherit from object

docs/advanced_topics/i18n/index.rst

@@ -171,7 +171,7 @@ Copy this into your project and make sure it's imported in any ``models.py`` fil
 
     from django.utils import translation
 
-    class TranslatedField(object):
+    class TranslatedField:
         def __init__(self, en_field, fr_field):
             self.en_field = en_field
             self.fr_field = fr_field

docs/reference/hooks.rst

@@ -64,7 +64,7 @@ Hooks for building new areas of the admin interface (alongside pages, images, do
 
     from wagtail.core import hooks
 
-    class WelcomePanel(object):
+    class WelcomePanel:
         order = 50
 
         def render(self):
@@ -503,7 +503,7 @@ Hooks for customising the way users are directed through the process of creating
 
     from wagtail.core import hooks
 
-    class UserbarPuppyLinkItem(object):
+    class UserbarPuppyLinkItem:
         def render(self, request):
             return '<li><a href="http://cuteoverload.com/tag/puppehs/" ' \
                 + 'target="_parent" class="action icon icon-wagtail">Puppies!</a></li>'

wagtail/admin/edit_handlers.py

@@ -85,7 +85,7 @@ def extract_panel_definitions_from_model_class(model, exclude=None):
     return panels
 
 
-class EditHandler(object):
+class EditHandler:
     """
     Abstract class providing sensible default behaviours for objects implementing
     the EditHandler API
@@ -319,7 +319,7 @@ class BaseTabbedInterface(BaseFormEditHandler):
     template = "wagtailadmin/edit_handlers/tabbed_interface.html"
 
 
-class TabbedInterface(object):
+class TabbedInterface:
     def __init__(self, children, base_form_class=None):
         self.children = children
         self.base_form_class = base_form_class
@@ -336,7 +336,7 @@ class BaseObjectList(BaseFormEditHandler):
     template = "wagtailadmin/edit_handlers/object_list.html"
 
 
-class ObjectList(object):
+class ObjectList:
     def __init__(self, children, heading="", classname="",
                  base_form_class=None):
         self.children = children
@@ -358,7 +358,7 @@ class BaseFieldRowPanel(BaseCompositeEditHandler):
     template = "wagtailadmin/edit_handlers/field_row_panel.html"
 
 
-class FieldRowPanel(object):
+class FieldRowPanel:
     def __init__(self, children, classname=""):
         self.children = children
         self.classname = classname
@@ -389,7 +389,7 @@ class BaseMultiFieldPanel(BaseCompositeEditHandler):
         return classes
 
 
-class MultiFieldPanel(object):
+class MultiFieldPanel:
     def __init__(self, children, heading="", classname=""):
         self.children = children
         self.heading = heading
@@ -502,7 +502,7 @@ class BaseFieldPanel(EditHandler):
             return []
 
 
-class FieldPanel(object):
+class FieldPanel:
     def __init__(self, field_name, classname="", widget=None):
         self.field_name = field_name
         self.classname = classname
@@ -527,7 +527,7 @@ class BaseRichTextFieldPanel(BaseFieldPanel):
         return compare.RichTextFieldComparison
 
 
-class RichTextFieldPanel(object):
+class RichTextFieldPanel:
     def __init__(self, field_name):
         self.field_name = field_name
 
@@ -606,7 +606,7 @@ class BasePageChooserPanel(BaseChooserPanel):
             return [cls.model._meta.get_field(cls.field_name).remote_field.model]
 
 
-class PageChooserPanel(object):
+class PageChooserPanel:
     def __init__(self, field_name, page_type=None, can_choose_root=False):
         self.field_name = field_name
 
@@ -733,7 +733,7 @@ class BaseInlinePanel(EditHandler):
         }))
 
 
-class InlinePanel(object):
+class InlinePanel:
     def __init__(self, relation_name, panels=None, classname='', label='', help_text='', min_num=None, max_num=None):
         self.relation_name = relation_name
         self.panels = panels
@@ -846,7 +846,7 @@ class BaseStreamFieldPanel(BaseFieldPanel):
         return ""
 
 
-class StreamFieldPanel(object):
+class StreamFieldPanel:
     def __init__(self, field_name, classname=''):
         self.field_name = field_name
         self.classname = classname

wagtail/admin/menu.py

@@ -49,7 +49,7 @@ class MenuItem(metaclass=MediaDefiningClass):
         return render_to_string(self.template, context, request=request)
 
 
-class Menu(object):
+class Menu:
     def __init__(self, register_hook_name, construct_hook_name=None):
         self.register_hook_name = register_hook_name
         self.construct_hook_name = construct_hook_name

wagtail/admin/rich_text.py

@@ -10,7 +10,7 @@ from wagtail.admin.edit_handlers import RichTextFieldPanel
 from wagtail.core.rich_text import DbWhitelister, expand_db_html, features
 
 
-class HalloPlugin(object):
+class HalloPlugin:
     def __init__(self, **kwargs):
         self.name = kwargs.get('name', None)
         self.options = kwargs.get('options', {})

wagtail/admin/search.py

@@ -56,7 +56,7 @@ class SearchArea(metaclass=MediaDefiningClass):
         }, request=request)
 
 
-class Search(object):
+class Search:
     def __init__(self, register_hook_name, construct_hook_name=None):
         self.register_hook_name = register_hook_name
         self.construct_hook_name = construct_hook_name

wagtail/admin/site_summary.py

@@ -5,7 +5,7 @@ from wagtail.core import hooks
 from wagtail.core.models import Page, Site
 
 
-class SummaryItem(object):
+class SummaryItem:
     order = 100
 
     def __init__(self, request):
@@ -51,7 +51,7 @@ def add_pages_summary_item(request, items):
     items.append(PagesSummaryItem(request))
 
 
-class SiteSummaryPanel(object):
+class SiteSummaryPanel:
     name = 'site_summary'
     order = 100
 

wagtail/admin/tests/test_edit_handlers.py

@@ -149,7 +149,7 @@ class TestPageEditHandlers(TestCase):
 
     @clear_edit_handler(ValidatedPage)
     def test_check_invalid_base_form_class(self):
-        class BadFormClass(object):
+        class BadFormClass:
             pass
 
         invalid_base_form = checks.Error(

wagtail/admin/userbar.py

@@ -1,7 +1,7 @@
 from django.template.loader import render_to_string
 
 
-class BaseItem(object):
+class BaseItem:
     template = 'wagtailadmin/userbar/item_base.html'
 
     def render(self, request):

wagtail/admin/utils.py

@@ -173,7 +173,7 @@ def any_permission_required(*perms):
     return user_passes_test(test)
 
 
-class PermissionPolicyChecker(object):
+class PermissionPolicyChecker:
     """
     Provides a view decorator that enforces the given permission policy,
     returning the wagtailadmin 'permission denied' response if permission not granted

wagtail/admin/views/generic.py

@@ -10,7 +10,7 @@ from wagtail.admin import messages
 from wagtail.admin.utils import permission_denied
 
 
-class PermissionCheckedMixin(object):
+class PermissionCheckedMixin:
     """
     Mixin for class-based views to enforce permission checks according to
     a permission policy (see wagtail.core.permission_policies).

wagtail/admin/views/home.py

@@ -17,7 +17,7 @@ User = get_user_model()
 
 # Panels for the homepage
 
-class UpgradeNotificationPanel(object):
+class UpgradeNotificationPanel:
     name = 'upgrade_notification'
     order = 100
 
@@ -31,7 +31,7 @@ class UpgradeNotificationPanel(object):
             return ""
 
 
-class PagesForModerationPanel(object):
+class PagesForModerationPanel:
     name = 'pages_for_moderation'
     order = 200
 
@@ -47,7 +47,7 @@ class PagesForModerationPanel(object):
         }, request=self.request)
 
 
-class RecentEditsPanel(object):
+class RecentEditsPanel:
     name = 'recent_edits'
     order = 300
 

wagtail/admin/views/mixins.py

@@ -5,7 +5,7 @@ from wagtail.search.backends import get_search_backend
 from wagtail.search.index import class_is_indexed
 
 
-class SearchableListMixin(object):
+class SearchableListMixin:
     search_box_placeholder = _("Search")
     search_fields = None
 

wagtail/admin/viewsets/__init__.py

@@ -3,7 +3,7 @@ from django.conf.urls import url, include
 from wagtail.core import hooks
 
 
-class ViewSetRegistry(object):
+class ViewSetRegistry:
     def __init__(self):
         self.viewsets = []
 

wagtail/admin/viewsets/base.py

@@ -1,5 +1,5 @@
 
-class ViewSet(object):
+class ViewSet:
     def __init__(self, name, **kwargs):
         self.name = name
         self.url_prefix = kwargs.pop('url_prefix', self.name)

wagtail/admin/widgets.py

@@ -214,7 +214,7 @@ class AdminPageChooser(AdminChooser):
 
 
 @total_ordering
-class Button(object):
+class Button:
     show = True
 
     def __init__(self, label, url, classes=set(), attrs={}, priority=1000):

wagtail/api/conf.py

@@ -1,5 +1,5 @@
 
-class APIField(object):
+class APIField:
     def __init__(self, name, serializer=None):
         self.name = name
         self.serializer = serializer

wagtail/api/v2/router.py

@@ -5,7 +5,7 @@ from django.conf.urls import include, url
 from wagtail.utils.urlpatterns import decorate_urlpatterns
 
 
-class WagtailAPIRouter(object):
+class WagtailAPIRouter:
     """
     A class that provides routing and cross-linking for a collection
     of API endpoints

wagtail/contrib/forms/edit_handlers.py

@@ -23,7 +23,7 @@ class BaseFormSubmissionsPanel(EditHandler):
         }))
 
 
-class FormSubmissionsPanel(object):
+class FormSubmissionsPanel:
     def __init__(self, heading=None):
         self.heading = heading
 

wagtail/contrib/forms/forms.py

@@ -16,7 +16,7 @@ class BaseForm(django.forms.Form):
         super(BaseForm, self).__init__(*args, **kwargs)
 
 
-class FormBuilder(object):
+class FormBuilder:
     def __init__(self, fields):
         self.fields = fields
 

wagtail/contrib/frontend_cache/backends.py

@@ -18,7 +18,7 @@ class PurgeRequest(Request):
         return 'PURGE'
 
 
-class BaseBackend(object):
+class BaseBackend:
     def purge(self, url):
         raise NotImplementedError
 

wagtail/contrib/frontend_cache/utils.py

@@ -91,7 +91,7 @@ def purge_pages_from_cache(pages, backend_settings=None, backends=None):
         purge_urls_from_cache(urls, backend_settings, backends)
 
 
-class PurgeBatch(object):
+class PurgeBatch:
     """Represents a list of URLs to be purged in a single request"""
     def __init__(self, urls=None):
         self.urls = []

wagtail/contrib/modeladmin/helpers/button.py

@@ -3,7 +3,7 @@ from django.utils.encoding import force_text
 from django.utils.translation import ugettext as _
 
 
-class ButtonHelper(object):
+class ButtonHelper:
 
     default_button_classnames = ['button']
     add_button_classnames = ['bicolor', 'icon', 'icon-plus']

wagtail/contrib/modeladmin/helpers/permission.py

@@ -5,7 +5,7 @@ from django.contrib.contenttypes.models import ContentType
 from wagtail.core.models import Page, UserPagePermissionsProxy
 
 
-class PermissionHelper(object):
+class PermissionHelper:
     """
     Provides permission-related helper functions to help determine what a
     user can do with a 'typical' model (where permissions are granted

wagtail/contrib/modeladmin/helpers/url.py

@@ -3,7 +3,7 @@ from django.utils.functional import cached_property
 from django.utils.http import urlquote
 
 
-class AdminURLHelper(object):
+class AdminURLHelper:
 
     def __init__(self, model):
         self.model = model

wagtail/contrib/modeladmin/mixins.py

@@ -5,7 +5,7 @@ from django.utils.safestring import mark_safe
 from django.utils.translation import ugettext_lazy as _
 
 
-class ThumbnailMixin(object):
+class ThumbnailMixin:
     """
     Mixin class to help display thumbnail images in ModelAdmin listing results.
     `thumb_image_field_name` must be overridden to name a ForeignKey field on

wagtail/contrib/modeladmin/options.py

@@ -15,7 +15,7 @@ from .mixins import ThumbnailMixin  # NOQA
 from .views import ChooseParentView, CreateView, DeleteView, EditView, IndexView, InspectView
 
 
-class WagtailRegisterable(object):
+class WagtailRegisterable:
     """
     Base class, providing a more convenient way for ModelAdmin or
     ModelAdminGroup instances to be registered with Wagtail's admin area.

wagtail/contrib/postgres_search/backend.py

@@ -21,7 +21,7 @@ from .utils import (
 # TODO: Add autocomplete.
 
 
-class Index(object):
+class Index:
     def __init__(self, backend, model, db_alias=None):
         self.backend = backend
         self.model = model

wagtail/contrib/routable_page/models.py

@@ -29,7 +29,7 @@ def route(pattern, name=None):
     return decorator
 
 
-class RoutablePageMixin(object):
+class RoutablePageMixin:
     """
     This class can be mixed in to a Page model, allowing extra routes to be
     added to it.

wagtail/contrib/routable_page/tests.py

@@ -133,7 +133,7 @@ class TestRoutablePage(TestCase):
         # This descriptor pretends that it does not exist in the class, hence
         # it raises an AttributeError when class bound. This is, for instance,
         # the behavior of django's FileFields.
-        class InstanceDescriptor(object):
+        class InstanceDescriptor:
             def __get__(self, instance, cls=None):
                 if instance is None:
                     raise AttributeError

wagtail/core/blocks/base.py

@@ -42,7 +42,7 @@ class Block(metaclass=BaseBlock):
 
     TEMPLATE_VAR = 'value'
 
-    class Meta(object):
+    class Meta:
         label = None
         icon = "placeholder"
         classname = None
@@ -402,7 +402,7 @@ class Block(metaclass=BaseBlock):
         return not self.__eq__(other)
 
 
-class BoundBlock(object):
+class BoundBlock:
     def __init__(self, block, value, prefix=None, errors=None):
         self.block = block
         self.value = value

wagtail/core/fields.py

@@ -21,7 +21,7 @@ class RichTextField(models.TextField):
 
 
 # https://github.com/django/django/blob/64200c14e0072ba0ffef86da46b2ea82fd1e019a/django/db/models/fields/subclassing.py#L31-L44
-class Creator(object):
+class Creator:
     """
     A placeholder class that provides a way to set the attribute on the model.
     """

wagtail/core/models.py

@@ -1562,7 +1562,7 @@ class GroupPagePermission(models.Model):
         )
 
 
-class UserPagePermissionsProxy(object):
+class UserPagePermissionsProxy:
     """Helper object that encapsulates all the page permission rules that this user has
     across the page hierarchy."""
     def __init__(self, user):
@@ -1648,7 +1648,7 @@ class UserPagePermissionsProxy(object):
         return self.publishable_pages().exists()
 
 
-class PagePermissionTester(object):
+class PagePermissionTester:
     def __init__(self, user_perms, page):
         self.user = user_perms.user
         self.user_perms = user_perms

wagtail/core/permission_policies/base.py

@@ -6,7 +6,7 @@ from django.db.models import Q
 from django.utils.functional import cached_property
 
 
-class BasePermissionPolicy(object):
+class BasePermissionPolicy:
     """
     A 'permission policy' is an object that handles all decisions about the actions
     users are allowed to perform on a given model. The mechanism by which it does this

wagtail/core/permission_policies/collections.py

@@ -8,7 +8,7 @@ from wagtail.core.models import Collection, GroupCollectionPermission
 from .base import BaseDjangoAuthPermissionPolicy
 
 
-class CollectionPermissionLookupMixin(object):
+class CollectionPermissionLookupMixin:
     def _get_permission_objects_for_actions(self, actions):
         """
         Get a queryset of the Permission objects for the given actions

wagtail/core/rich_text.py

@@ -15,7 +15,7 @@ from wagtail.core.whitelist import Whitelister
 # to DB representation and back again.
 
 
-class PageLinkHandler(object):
+class PageLinkHandler:
     """
     PageLinkHandler will be invoked whenever we encounter an <a> element in HTML content
     with an attribute of data-linktype="page". The resulting element in the database
@@ -179,7 +179,7 @@ def expand_db_html(html, for_editor=False):
     return html
 
 
-class RichText(object):
+class RichText:
     """
     A custom object used to represent a renderable rich text value.
     Provides a 'source' property to access the original source code,
@@ -200,7 +200,7 @@ class RichText(object):
     __nonzero__ = __bool__
 
 
-class FeatureRegistry(object):
+class FeatureRegistry:
     """
     A central store of information about optional features that can be enabled in rich text
     editors by passing a ``features`` list to the RichTextField, such as how to

wagtail/core/tests/test_blocks.py

@@ -181,7 +181,7 @@ class TestFieldBlock(WagtailTestUtils, SimpleTestCase):
         Actual real-world use case: A Youtube field that produces YoutubeVideo
         instances from IDs, but videos are entered using their full URLs.
         """
-        class PrefixWrapper(object):
+        class PrefixWrapper:
             prefix = 'http://example.com/'
 
             def __init__(self, value):

wagtail/core/tests/test_permission_policies.py

@@ -10,7 +10,7 @@ from wagtail.images.models import Image
 from wagtail.images.tests.utils import get_test_image_file
 
 
-class PermissionPolicyTestUtils(object):
+class PermissionPolicyTestUtils:
     def assertResultSetEqual(self, actual, expected):
         self.assertEqual(set(actual), set(expected))
 

wagtail/core/url_routing.py

@@ -1,5 +1,5 @@
 
-class RouteResult(object):
+class RouteResult:
     """
     An object to be returned from Page.route, which encapsulates
     all the information necessary to serve an HTTP response. Analogous to

wagtail/core/whitelist.py

@@ -63,7 +63,7 @@ def attribute_rule(allowed_attrs):
 allow_without_attributes = attribute_rule({})
 
 
-class Whitelister(object):
+class Whitelister:
     element_rules = {
         '[document]': allow_without_attributes,
         'a': attribute_rule({'href': check_url}),

wagtail/documents/edit_handlers.py

@@ -11,7 +11,7 @@ class BaseDocumentChooserPanel(BaseChooserPanel):
         return {cls.field_name: AdminDocumentChooser}
 
 
-class DocumentChooserPanel(object):
+class DocumentChooserPanel:
     def __init__(self, field_name):
         self.field_name = field_name
 

wagtail/documents/rich_text.py

@@ -3,7 +3,7 @@ from django.utils.html import escape
 from wagtail.documents.models import get_document_model
 
 
-class DocumentLinkHandler(object):
+class DocumentLinkHandler:
     @staticmethod
     def get_db_attributes(tag):
         return {'id': tag['data-id']}

wagtail/embeds/blocks.py

@@ -2,7 +2,7 @@ from wagtail.core import blocks
 from wagtail.embeds.format import embed_to_frontend_html
 
 
-class EmbedValue(object):
+class EmbedValue:
     """
     Native value of an EmbedBlock. Should, at minimum, have a 'url' property
     and render as the embed HTML when rendered in a template.

wagtail/embeds/finders/base.py

@@ -1,5 +1,5 @@
 
-class EmbedFinder(object):
+class EmbedFinder:
     def accept(self, url):
         return False
 

wagtail/embeds/rich_text.py

@@ -2,7 +2,7 @@ from wagtail.embeds import format
 from wagtail.embeds.exceptions import EmbedException
 
 
-class MediaEmbedHandler(object):
+class MediaEmbedHandler:
     """
     MediaEmbedHandler will be invoked whenever we encounter an element in HTML content
     with an attribute of data-embedtype="media". The resulting element in the database

wagtail/embeds/tests.py

@@ -300,7 +300,7 @@ class TestEmbedly(TestCase):
 
 class TestOembed(TestCase):
     def setUp(self):
-        class DummyResponse(object):
+        class DummyResponse:
             def read(self):
                 return b"foo"
         self.dummy_response = DummyResponse()

wagtail/images/edit_handlers.py

@@ -18,7 +18,7 @@ class BaseImageChooserPanel(BaseChooserPanel):
         return ImageFieldComparison
 
 
-class ImageChooserPanel(object):
+class ImageChooserPanel:
     def __init__(self, field_name):
         self.field_name = field_name
 

wagtail/images/formats.py

@@ -6,7 +6,7 @@ from wagtail.utils.apps import get_app_submodules
 from .shortcuts import get_rendition_or_not_found
 
 
-class Format(object):
+class Format:
     def __init__(self, name, label, classnames, filter_spec):
         self.name = name
         self.label = label

wagtail/images/image_operations.py

@@ -4,7 +4,7 @@ from wagtail.images.exceptions import InvalidFilterSpecError
 from wagtail.images.rect import Rect
 
 
-class Operation(object):
+class Operation:
     def __init__(self, method, *args):
         self.method = method
         self.args = args

wagtail/images/models.py

@@ -328,7 +328,7 @@ class Image(AbstractImage):
     )
 
 
-class Filter(object):
+class Filter:
     """
     Represents one or more operations that can be applied to an Image to produce a rendition
     appropriate for final display on the website. Usually this would be a resize operation,

wagtail/images/rect.py

@@ -1,7 +1,7 @@
 import math
 
 
-class Vector(object):
+class Vector:
     def __init__(self, x, y):
         self.x = x
         self.y = y
@@ -24,7 +24,7 @@ class Vector(object):
         )
 
 
-class Rect(object):
+class Rect:
     def __init__(self, left, top, right, bottom):
         self.left = left
         self.top = top

wagtail/images/rich_text.py

@@ -2,7 +2,7 @@ from wagtail.images import get_image_model
 from wagtail.images.formats import get_image_format
 
 
-class ImageEmbedHandler(object):
+class ImageEmbedHandler:
     """
     ImageEmbedHandler will be invoked whenever we encounter an element in HTML content
     with an attribute of data-embedtype="image". The resulting element in the database

wagtail/images/tests/test_image_operations.py

@@ -10,7 +10,7 @@ from wagtail.images.models import Filter, Image
 from wagtail.images.tests.utils import get_test_image_file, get_test_image_file_jpeg
 
 
-class WillowOperationRecorder(object):
+class WillowOperationRecorder:
     """
     This class pretends to be a Willow image but instead, it records
     the operations that have been performed on the image for testing

wagtail/search/backends/base.py

@@ -14,7 +14,7 @@ class FieldError(Exception):
     pass
 
 
-class BaseSearchQuery(object):
+class BaseSearchQuery:
     DEFAULT_OPERATOR = 'or'
 
     def __init__(self, queryset, query_string, fields=None, operator=None, order_by_relevance=True):
@@ -92,7 +92,7 @@ class BaseSearchQuery(object):
         return self._get_filters_from_where_node(self.queryset.query.where)
 
 
-class BaseSearchResults(object):
+class BaseSearchResults:
     def __init__(self, backend, query, prefetch_related=None):
         self.backend = backend
         self.query = query
@@ -197,7 +197,7 @@ class EmptySearchResults(BaseSearchResults):
         return 0
 
 
-class BaseSearchBackend(object):
+class BaseSearchBackend:
     query_class = None
     results_class = None
     rebuilder_class = None

wagtail/search/backends/elasticsearch2.py

@@ -40,7 +40,7 @@ def get_model_root(model):
     return model
 
 
-class Elasticsearch2Mapping(object):
+class Elasticsearch2Mapping:
     type_map = {
         'AutoField': 'integer',
         'BinaryField': 'binary',
@@ -619,7 +619,7 @@ class Elasticsearch2SearchResults(BaseSearchResults):
         return max(hit_count, 0)
 
 
-class Elasticsearch2Index(object):
+class Elasticsearch2Index:
     def __init__(self, backend, name):
         self.backend = backend
         self.es = backend.es
@@ -739,7 +739,7 @@ class Elasticsearch2Index(object):
         self.put()
 
 
-class ElasticsearchIndexRebuilder(object):
+class ElasticsearchIndexRebuilder:
     def __init__(self, index):
         self.index = index
 

wagtail/search/index.py

@@ -12,7 +12,7 @@ from wagtail.search.backends import get_search_backends_with_name
 logger = logging.getLogger('wagtail.search.index')
 
 
-class Indexed(object):
+class Indexed:
     @classmethod
     def indexed_get_parent(cls, require_model=True):
         for base in cls.__bases__:
@@ -161,7 +161,7 @@ def remove_object(instance):
                 logger.exception("Exception raised while deleting %r from the '%s' search backend", indexed_instance, backend_name)
 
 
-class BaseField(object):
+class BaseField:
     def __init__(self, field_name, **kwargs):
         self.field_name = field_name
         self.kwargs = kwargs
@@ -224,7 +224,7 @@ class FilterField(BaseField):
     pass
 
 
-class RelatedFields(object):
+class RelatedFields:
     def __init__(self, field_name, fields):
         self.field_name = field_name
         self.fields = fields

wagtail/search/queryset.py

@@ -1,7 +1,7 @@
 from wagtail.search.backends import get_search_backend
 
 
-class SearchableQuerySetMixin(object):
+class SearchableQuerySetMixin:
     def search(self, query_string, fields=None,
                operator=None, order_by_relevance=True, backend='default'):
         """

wagtail/search/tests/elasticsearch_common_tests.py

@@ -6,7 +6,7 @@ from django.core import management
 from wagtail.tests.search import models
 
 
-class ElasticsearchCommonSearchBackendTests(object):
+class ElasticsearchCommonSearchBackendTests:
     def test_search_with_spaces_only(self):
         # Search for some space characters and hope it doesn't crash
         results = self.backend.search("   ", models.Book)

wagtail/snippets/edit_handlers.py

@@ -30,7 +30,7 @@ class BaseSnippetChooserPanel(BaseChooserPanel):
         }))
 
 
-class SnippetChooserPanel(object):
+class SnippetChooserPanel:
     def __init__(self, field_name):
         self.field_name = field_name
 

wagtail/tests/assert_logs.py

@@ -5,7 +5,7 @@ from collections import namedtuple
 # Implementation of TestCase.assertLogs for pre-3.4 Python versions.
 # Borrowed from https://github.com/django/django/pull/3467/commits/1b4f10963628bb68246c193f1124a1f7b6e4c696
 
-class _BaseTestCaseContext(object):
+class _BaseTestCaseContext:
     def __init__(self, test_case):
         self.test_case = test_case
 

wagtail/tests/utils.py

@@ -11,7 +11,7 @@ from django.utils.text import slugify
 from wagtail.tests.assert_logs import _AssertLogsContext
 
 
-class WagtailTestUtils(object):
+class WagtailTestUtils:
 
     @staticmethod
     def create_test_user():

wagtail/users/views/groups.py

@@ -19,7 +19,7 @@ def get_permission_panel_classes():
     return _permission_panel_classes
 
 
-class PermissionPanelFormsMixin(object):
+class PermissionPanelFormsMixin:
     def get_permission_panel_form_kwargs(self, cls):
         kwargs = {}
 

wagtail/utils/decorators.py

@@ -10,7 +10,7 @@ class cached_classmethod(dict):
     """
     Cache the result of a no-arg class method.
     .. code-block:: python
-        class Foo(object):
+        class Foo:
             @cached_classmethod
             def bar(cls):
                 # Some expensive computation
@@ -35,7 +35,7 @@ class cached_classmethod(dict):
         return value
 
 
-class _cache(object):
+class _cache:
     """ Calls the real class method behind when called, caching the result """
     def __init__(self, cache, cls, fn):
         self.cache = cache

wagtail/utils/setup.py

@@ -10,7 +10,7 @@ from setuptools.command.sdist import sdist as base_sdist
 from wagtail import __semver__
 
 
-class assets_mixin(object):
+class assets_mixin:
 
     def compile_assets(self):
         try: