Refs #33476 -- Reformatted code with Black.

tests/admin_checks/models.py

@@ -17,7 +17,7 @@ class Song(models.Model):
     original_release = models.DateField(editable=False)
 
     class Meta:
-        ordering = ('title',)
+        ordering = ("title",)
 
     def __str__(self):
         return self.title
@@ -41,7 +41,7 @@ class Book(models.Model):
     name = models.CharField(max_length=100)
     subtitle = models.CharField(max_length=100)
     price = models.FloatField()
-    authors = models.ManyToManyField(Author, through='AuthorsBooks')
+    authors = models.ManyToManyField(Author, through="AuthorsBooks")
 
 
 class AuthorsBooks(models.Model):
@@ -63,4 +63,4 @@ class Influence(models.Model):
 
     content_type = models.ForeignKey(ContentType, models.CASCADE)
     object_id = models.PositiveIntegerField()
-    content_object = GenericForeignKey('content_type', 'object_id')
+    content_object = GenericForeignKey("content_type", "object_id")

tests/admin_checks/tests.py

@@ -9,9 +9,7 @@ from django.contrib.sessions.middleware import SessionMiddleware
 from django.core import checks
 from django.test import SimpleTestCase, override_settings
 
-from .models import (
-    Album, Author, Book, City, Influence, Song, State, TwoAlbumFKAndAnE,
-)
+from .models import Album, Author, Book, City, Influence, Song, State, TwoAlbumFKAndAnE
 
 
 class SongForm(forms.ModelForm):
@@ -20,25 +18,29 @@ class SongForm(forms.ModelForm):
 
 class ValidFields(admin.ModelAdmin):
     form = SongForm
-    fields = ['title']
+    fields = ["title"]
 
 
 class ValidFormFieldsets(admin.ModelAdmin):
     def get_form(self, request, obj=None, **kwargs):
         class ExtraFieldForm(SongForm):
             name = forms.CharField(max_length=50)
+
         return ExtraFieldForm
 
     fieldsets = (
-        (None, {
-            'fields': ('name',),
-        }),
+        (
+            None,
+            {
+                "fields": ("name",),
+            },
+        ),
     )
 
 
 class MyAdmin(admin.ModelAdmin):
     def check(self, **kwargs):
-        return ['error!']
+        return ["error!"]
 
 
 class AuthenticationMiddlewareSubclass(AuthenticationMiddleware):
@@ -58,27 +60,26 @@ class SessionMiddlewareSubclass(SessionMiddleware):
 
 
 @override_settings(
-    SILENCED_SYSTEM_CHECKS=['fields.W342'],  # ForeignKey(unique=True)
+    SILENCED_SYSTEM_CHECKS=["fields.W342"],  # ForeignKey(unique=True)
     INSTALLED_APPS=[
-        'django.contrib.admin',
-        'django.contrib.auth',
-        'django.contrib.contenttypes',
-        'django.contrib.messages',
-        'admin_checks',
+        "django.contrib.admin",
+        "django.contrib.auth",
+        "django.contrib.contenttypes",
+        "django.contrib.messages",
+        "admin_checks",
     ],
 )
 class SystemChecksTestCase(SimpleTestCase):
-
     def test_checks_are_performed(self):
         admin.site.register(Song, MyAdmin)
         try:
             errors = checks.run_checks()
-            expected = ['error!']
+            expected = ["error!"]
             self.assertEqual(errors, expected)
         finally:
             admin.site.unregister(Song)
 
-    @override_settings(INSTALLED_APPS=['django.contrib.admin'])
+    @override_settings(INSTALLED_APPS=["django.contrib.admin"])
     def test_apps_dependencies(self):
         errors = admin.checks.check_dependencies()
         expected = [
@@ -90,36 +91,41 @@ class SystemChecksTestCase(SimpleTestCase):
             checks.Error(
                 "'django.contrib.auth' must be in INSTALLED_APPS in order "
                 "to use the admin application.",
-                id='admin.E405',
+                id="admin.E405",
             ),
             checks.Error(
                 "'django.contrib.messages' must be in INSTALLED_APPS in order "
                 "to use the admin application.",
-                id='admin.E406',
+                id="admin.E406",
             ),
         ]
         self.assertEqual(errors, expected)
 
     @override_settings(TEMPLATES=[])
     def test_no_template_engines(self):
-        self.assertEqual(admin.checks.check_dependencies(), [
-            checks.Error(
-                "A 'django.template.backends.django.DjangoTemplates' "
-                "instance must be configured in TEMPLATES in order to use "
-                "the admin application.",
-                id='admin.E403',
-            )
-        ])
+        self.assertEqual(
+            admin.checks.check_dependencies(),
+            [
+                checks.Error(
+                    "A 'django.template.backends.django.DjangoTemplates' "
+                    "instance must be configured in TEMPLATES in order to use "
+                    "the admin application.",
+                    id="admin.E403",
+                )
+            ],
+        )
 
     @override_settings(
-        TEMPLATES=[{
-            'BACKEND': 'django.template.backends.django.DjangoTemplates',
-            'DIRS': [],
-            'APP_DIRS': True,
-            'OPTIONS': {
-                'context_processors': [],
-            },
-        }],
+        TEMPLATES=[
+            {
+                "BACKEND": "django.template.backends.django.DjangoTemplates",
+                "DIRS": [],
+                "APP_DIRS": True,
+                "OPTIONS": {
+                    "context_processors": [],
+                },
+            }
+        ],
     )
     def test_context_processor_dependencies(self):
         expected = [
@@ -127,20 +133,20 @@ class SystemChecksTestCase(SimpleTestCase):
                 "'django.contrib.auth.context_processors.auth' must be "
                 "enabled in DjangoTemplates (TEMPLATES) if using the default "
                 "auth backend in order to use the admin application.",
-                id='admin.E402',
+                id="admin.E402",
             ),
             checks.Error(
                 "'django.contrib.messages.context_processors.messages' must "
                 "be enabled in DjangoTemplates (TEMPLATES) in order to use "
                 "the admin application.",
-                id='admin.E404',
+                id="admin.E404",
             ),
             checks.Warning(
                 "'django.template.context_processors.request' must be enabled "
                 "in DjangoTemplates (TEMPLATES) in order to use the admin "
                 "navigation sidebar.",
-                id='admin.W411',
-            )
+                id="admin.W411",
+            ),
         ]
         self.assertEqual(admin.checks.check_dependencies(), expected)
         # The first error doesn't happen if
@@ -150,45 +156,50 @@ class SystemChecksTestCase(SimpleTestCase):
             self.assertEqual(admin.checks.check_dependencies(), expected[1:])
 
     @override_settings(
-        AUTHENTICATION_BACKENDS=['admin_checks.tests.ModelBackendSubclass'],
-        TEMPLATES=[{
-            'BACKEND': 'django.template.backends.django.DjangoTemplates',
-            'DIRS': [],
-            'APP_DIRS': True,
-            'OPTIONS': {
-                'context_processors': [
-                    'django.template.context_processors.request',
-                    'django.contrib.messages.context_processors.messages',
-                ],
-            },
-        }],
+        AUTHENTICATION_BACKENDS=["admin_checks.tests.ModelBackendSubclass"],
+        TEMPLATES=[
+            {
+                "BACKEND": "django.template.backends.django.DjangoTemplates",
+                "DIRS": [],
+                "APP_DIRS": True,
+                "OPTIONS": {
+                    "context_processors": [
+                        "django.template.context_processors.request",
+                        "django.contrib.messages.context_processors.messages",
+                    ],
+                },
+            }
+        ],
     )
     def test_context_processor_dependencies_model_backend_subclass(self):
-        self.assertEqual(admin.checks.check_dependencies(), [
-            checks.Error(
-                "'django.contrib.auth.context_processors.auth' must be "
-                "enabled in DjangoTemplates (TEMPLATES) if using the default "
-                "auth backend in order to use the admin application.",
-                id='admin.E402',
-            ),
-        ])
+        self.assertEqual(
+            admin.checks.check_dependencies(),
+            [
+                checks.Error(
+                    "'django.contrib.auth.context_processors.auth' must be "
+                    "enabled in DjangoTemplates (TEMPLATES) if using the default "
+                    "auth backend in order to use the admin application.",
+                    id="admin.E402",
+                ),
+            ],
+        )
 
     @override_settings(
         TEMPLATES=[
             {
-                'BACKEND': 'django.template.backends.dummy.TemplateStrings',
-                'DIRS': [],
-                'APP_DIRS': True,
+                "BACKEND": "django.template.backends.dummy.TemplateStrings",
+                "DIRS": [],
+                "APP_DIRS": True,
             },
             {
-                'BACKEND': 'django.template.backends.django.DjangoTemplates',
-                'DIRS': [],
-                'APP_DIRS': True,
-                'OPTIONS': {
-                    'context_processors': [
-                        'django.template.context_processors.request',
-                        'django.contrib.auth.context_processors.auth',
-                        'django.contrib.messages.context_processors.messages',
+                "BACKEND": "django.template.backends.django.DjangoTemplates",
+                "DIRS": [],
+                "APP_DIRS": True,
+                "OPTIONS": {
+                    "context_processors": [
+                        "django.template.context_processors.request",
+                        "django.contrib.auth.context_processors.auth",
+                        "django.contrib.messages.context_processors.messages",
                     ],
                 },
             },
@@ -204,12 +215,12 @@ class SystemChecksTestCase(SimpleTestCase):
             checks.Error(
                 "'django.contrib.auth.middleware.AuthenticationMiddleware' "
                 "must be in MIDDLEWARE in order to use the admin application.",
-                id='admin.E408',
+                id="admin.E408",
             ),
             checks.Error(
                 "'django.contrib.messages.middleware.MessageMiddleware' "
                 "must be in MIDDLEWARE in order to use the admin application.",
-                id='admin.E409',
+                id="admin.E409",
             ),
             checks.Error(
                 "'django.contrib.sessions.middleware.SessionMiddleware' "
@@ -220,25 +231,29 @@ class SystemChecksTestCase(SimpleTestCase):
                     "before "
                     "'django.contrib.auth.middleware.AuthenticationMiddleware'."
                 ),
-                id='admin.E410',
+                id="admin.E410",
             ),
         ]
         self.assertEqual(errors, expected)
 
-    @override_settings(MIDDLEWARE=[
-        'admin_checks.tests.AuthenticationMiddlewareSubclass',
-        'admin_checks.tests.MessageMiddlewareSubclass',
-        'admin_checks.tests.SessionMiddlewareSubclass',
-    ])
+    @override_settings(
+        MIDDLEWARE=[
+            "admin_checks.tests.AuthenticationMiddlewareSubclass",
+            "admin_checks.tests.MessageMiddlewareSubclass",
+            "admin_checks.tests.SessionMiddlewareSubclass",
+        ]
+    )
     def test_middleware_subclasses(self):
         self.assertEqual(admin.checks.check_dependencies(), [])
 
-    @override_settings(MIDDLEWARE=[
-        'django.contrib.does.not.Exist',
-        'django.contrib.auth.middleware.AuthenticationMiddleware',
-        'django.contrib.messages.middleware.MessageMiddleware',
-        'django.contrib.sessions.middleware.SessionMiddleware',
-    ])
+    @override_settings(
+        MIDDLEWARE=[
+            "django.contrib.does.not.Exist",
+            "django.contrib.auth.middleware.AuthenticationMiddleware",
+            "django.contrib.messages.middleware.MessageMiddleware",
+            "django.contrib.sessions.middleware.SessionMiddleware",
+        ]
+    )
     def test_admin_check_ignores_import_error_in_middleware(self):
         self.assertEqual(admin.checks.check_dependencies(), [])
 
@@ -250,7 +265,7 @@ class SystemChecksTestCase(SimpleTestCase):
         custom_site.register(Song, MyAdmin)
         try:
             errors = checks.run_checks()
-            expected = ['error!']
+            expected = ["error!"]
             self.assertEqual(errors, expected)
         finally:
             custom_site.unregister(Song)
@@ -261,7 +276,7 @@ class SystemChecksTestCase(SimpleTestCase):
                 errors = super().check(**kwargs)
                 author_admin = self.admin_site._registry.get(Author)
                 if author_admin is None:
-                    errors.append('AuthorAdmin missing!')
+                    errors.append("AuthorAdmin missing!")
                 return errors
 
         class MyAuthorAdmin(admin.ModelAdmin):
@@ -285,35 +300,41 @@ class SystemChecksTestCase(SimpleTestCase):
                 "The value of 'list_editable[0]' refers to 'original_release', "
                 "which is not contained in 'list_display'.",
                 obj=SongAdmin,
-                id='admin.E122',
+                id="admin.E122",
             )
         ]
         self.assertEqual(errors, expected)
 
     def test_list_editable_not_a_list_or_tuple(self):
         class SongAdmin(admin.ModelAdmin):
-            list_editable = 'test'
+            list_editable = "test"
 
-        self.assertEqual(SongAdmin(Song, AdminSite()).check(), [
-            checks.Error(
-                "The value of 'list_editable' must be a list or tuple.",
-                obj=SongAdmin,
-                id='admin.E120',
-            )
-        ])
+        self.assertEqual(
+            SongAdmin(Song, AdminSite()).check(),
+            [
+                checks.Error(
+                    "The value of 'list_editable' must be a list or tuple.",
+                    obj=SongAdmin,
+                    id="admin.E120",
+                )
+            ],
+        )
 
     def test_list_editable_missing_field(self):
         class SongAdmin(admin.ModelAdmin):
-            list_editable = ('test',)
+            list_editable = ("test",)
 
-        self.assertEqual(SongAdmin(Song, AdminSite()).check(), [
-            checks.Error(
-                "The value of 'list_editable[0]' refers to 'test', which is "
-                "not a field of 'admin_checks.Song'.",
-                obj=SongAdmin,
-                id='admin.E121',
-            )
-        ])
+        self.assertEqual(
+            SongAdmin(Song, AdminSite()).check(),
+            [
+                checks.Error(
+                    "The value of 'list_editable[0]' refers to 'test', which is "
+                    "not a field of 'admin_checks.Song'.",
+                    obj=SongAdmin,
+                    id="admin.E121",
+                )
+            ],
+        )
 
     def test_readonly_and_editable(self):
         class SongAdmin(admin.ModelAdmin):
@@ -321,17 +342,21 @@ class SystemChecksTestCase(SimpleTestCase):
             list_display = ["pk", "original_release"]
             list_editable = ["original_release"]
             fieldsets = [
-                (None, {
-                    "fields": ["title", "original_release"],
-                }),
+                (
+                    None,
+                    {
+                        "fields": ["title", "original_release"],
+                    },
+                ),
             ]
+
         errors = SongAdmin(Song, AdminSite()).check()
         expected = [
             checks.Error(
                 "The value of 'list_editable[0]' refers to 'original_release', "
                 "which is not editable through the admin.",
                 obj=SongAdmin,
-                id='admin.E125',
+                id="admin.E125",
             )
         ]
         self.assertEqual(errors, expected)
@@ -341,9 +366,12 @@ class SystemChecksTestCase(SimpleTestCase):
             list_display = ["pk", "title"]
             list_editable = ["title"]
             fieldsets = [
-                (None, {
-                    "fields": ["title", "original_release"],
-                }),
+                (
+                    None,
+                    {
+                        "fields": ["title", "original_release"],
+                    },
+                ),
             ]
 
         errors = SongAdmin(Song, AdminSite()).check()
@@ -368,13 +396,12 @@ class SystemChecksTestCase(SimpleTestCase):
         """
         The first fieldset's fields must be a list/tuple.
         """
+
         class NotATupleAdmin(admin.ModelAdmin):
             list_display = ["pk", "title"]
             list_editable = ["title"]
             fieldsets = [
-                (None, {
-                    "fields": "title"  # not a tuple
-                }),
+                (None, {"fields": "title"}),  # not a tuple
             ]
 
         errors = NotATupleAdmin(Song, AdminSite()).check()
@@ -382,7 +409,7 @@ class SystemChecksTestCase(SimpleTestCase):
             checks.Error(
                 "The value of 'fieldsets[0][1]['fields']' must be a list or tuple.",
                 obj=NotATupleAdmin,
-                id='admin.E008',
+                id="admin.E008",
             )
         ]
         self.assertEqual(errors, expected)
@@ -391,14 +418,11 @@ class SystemChecksTestCase(SimpleTestCase):
         """
         The second fieldset's fields must be a list/tuple.
         """
+
         class NotATupleAdmin(admin.ModelAdmin):
             fieldsets = [
-                (None, {
-                    "fields": ("title",)
-                }),
-                ('foo', {
-                    "fields": "author"  # not a tuple
-                }),
+                (None, {"fields": ("title",)}),
+                ("foo", {"fields": "author"}),  # not a tuple
             ]
 
         errors = NotATupleAdmin(Song, AdminSite()).check()
@@ -406,7 +430,7 @@ class SystemChecksTestCase(SimpleTestCase):
             checks.Error(
                 "The value of 'fieldsets[1][1]['fields']' must be a list or tuple.",
                 obj=NotATupleAdmin,
-                id='admin.E008',
+                id="admin.E008",
             )
         ]
         self.assertEqual(errors, expected)
@@ -415,29 +439,30 @@ class SystemChecksTestCase(SimpleTestCase):
         """
         Tests for basic system checks of 'exclude' option values (#12689)
         """
+
         class ExcludedFields1(admin.ModelAdmin):
-            exclude = 'foo'
+            exclude = "foo"
 
         errors = ExcludedFields1(Book, AdminSite()).check()
         expected = [
             checks.Error(
                 "The value of 'exclude' must be a list or tuple.",
                 obj=ExcludedFields1,
-                id='admin.E014',
+                id="admin.E014",
             )
         ]
         self.assertEqual(errors, expected)
 
     def test_exclude_duplicate_values(self):
         class ExcludedFields2(admin.ModelAdmin):
-            exclude = ('name', 'name')
+            exclude = ("name", "name")
 
         errors = ExcludedFields2(Book, AdminSite()).check()
         expected = [
             checks.Error(
                 "The value of 'exclude' contains duplicate field(s).",
                 obj=ExcludedFields2,
-                id='admin.E015',
+                id="admin.E015",
             )
         ]
         self.assertEqual(errors, expected)
@@ -445,7 +470,7 @@ class SystemChecksTestCase(SimpleTestCase):
     def test_exclude_in_inline(self):
         class ExcludedFieldsInline(admin.TabularInline):
             model = Song
-            exclude = 'foo'
+            exclude = "foo"
 
         class ExcludedFieldsAlbumAdmin(admin.ModelAdmin):
             model = Album
@@ -456,7 +481,7 @@ class SystemChecksTestCase(SimpleTestCase):
             checks.Error(
                 "The value of 'exclude' must be a list or tuple.",
                 obj=ExcludedFieldsInline,
-                id='admin.E014',
+                id="admin.E014",
             )
         ]
         self.assertEqual(errors, expected)
@@ -466,9 +491,10 @@ class SystemChecksTestCase(SimpleTestCase):
         Regression test for #9932 - exclude in InlineModelAdmin should not
         contain the ForeignKey field used in ModelAdmin.model
         """
+
         class SongInline(admin.StackedInline):
             model = Song
-            exclude = ['album']
+            exclude = ["album"]
 
         class AlbumAdmin(admin.ModelAdmin):
             model = Album
@@ -480,7 +506,7 @@ class SystemChecksTestCase(SimpleTestCase):
                 "Cannot exclude the field 'album', because it is the foreign key "
                 "to the parent model 'admin_checks.Album'.",
                 obj=SongInline,
-                id='admin.E201',
+                id="admin.E201",
             )
         ]
         self.assertEqual(errors, expected)
@@ -490,6 +516,7 @@ class SystemChecksTestCase(SimpleTestCase):
         Regression test for #22034 - check that generic inlines don't look for
         normal ForeignKey relations.
         """
+
         class InfluenceInline(GenericStackedInline):
             model = Influence
 
@@ -504,6 +531,7 @@ class SystemChecksTestCase(SimpleTestCase):
         A model without a GenericForeignKey raises problems if it's included
         in a GenericInlineModelAdmin definition.
         """
+
         class BookInline(GenericStackedInline):
             model = Book
 
@@ -515,7 +543,7 @@ class SystemChecksTestCase(SimpleTestCase):
             checks.Error(
                 "'admin_checks.Book' has no GenericForeignKey.",
                 obj=BookInline,
-                id='admin.E301',
+                id="admin.E301",
             )
         ]
         self.assertEqual(errors, expected)
@@ -525,9 +553,10 @@ class SystemChecksTestCase(SimpleTestCase):
         A GenericInlineModelAdmin errors if the ct_field points to a
         nonexistent field.
         """
+
         class InfluenceInline(GenericStackedInline):
             model = Influence
-            ct_field = 'nonexistent'
+            ct_field = "nonexistent"
 
         class SongAdmin(admin.ModelAdmin):
             inlines = [InfluenceInline]
@@ -537,7 +566,7 @@ class SystemChecksTestCase(SimpleTestCase):
             checks.Error(
                 "'ct_field' references 'nonexistent', which is not a field on 'admin_checks.Influence'.",
                 obj=InfluenceInline,
-                id='admin.E302',
+                id="admin.E302",
             )
         ]
         self.assertEqual(errors, expected)
@@ -547,9 +576,10 @@ class SystemChecksTestCase(SimpleTestCase):
         A GenericInlineModelAdmin errors if the ct_fk_field points to a
         nonexistent field.
         """
+
         class InfluenceInline(GenericStackedInline):
             model = Influence
-            ct_fk_field = 'nonexistent'
+            ct_fk_field = "nonexistent"
 
         class SongAdmin(admin.ModelAdmin):
             inlines = [InfluenceInline]
@@ -559,7 +589,7 @@ class SystemChecksTestCase(SimpleTestCase):
             checks.Error(
                 "'ct_fk_field' references 'nonexistent', which is not a field on 'admin_checks.Influence'.",
                 obj=InfluenceInline,
-                id='admin.E303',
+                id="admin.E303",
             )
         ]
         self.assertEqual(errors, expected)
@@ -569,9 +599,10 @@ class SystemChecksTestCase(SimpleTestCase):
         A GenericInlineModelAdmin raises problems if the ct_field points to a
         field that isn't part of a GenericForeignKey.
         """
+
         class InfluenceInline(GenericStackedInline):
             model = Influence
-            ct_field = 'name'
+            ct_field = "name"
 
         class SongAdmin(admin.ModelAdmin):
             inlines = [InfluenceInline]
@@ -582,7 +613,7 @@ class SystemChecksTestCase(SimpleTestCase):
                 "'admin_checks.Influence' has no GenericForeignKey using "
                 "content type field 'name' and object ID field 'object_id'.",
                 obj=InfluenceInline,
-                id='admin.E304',
+                id="admin.E304",
             )
         ]
         self.assertEqual(errors, expected)
@@ -592,9 +623,10 @@ class SystemChecksTestCase(SimpleTestCase):
         A GenericInlineModelAdmin raises problems if the ct_fk_field points to
         a field that isn't part of a GenericForeignKey.
         """
+
         class InfluenceInline(GenericStackedInline):
             model = Influence
-            ct_fk_field = 'name'
+            ct_fk_field = "name"
 
         class SongAdmin(admin.ModelAdmin):
             inlines = [InfluenceInline]
@@ -605,14 +637,14 @@ class SystemChecksTestCase(SimpleTestCase):
                 "'admin_checks.Influence' has no GenericForeignKey using "
                 "content type field 'content_type' and object ID field 'name'.",
                 obj=InfluenceInline,
-                id='admin.E304',
+                id="admin.E304",
             )
         ]
         self.assertEqual(errors, expected)
 
     def test_app_label_in_admin_checks(self):
         class RawIdNonexistentAdmin(admin.ModelAdmin):
-            raw_id_fields = ('nonexistent',)
+            raw_id_fields = ("nonexistent",)
 
         errors = RawIdNonexistentAdmin(Album, AdminSite()).check()
         expected = [
@@ -620,7 +652,7 @@ class SystemChecksTestCase(SimpleTestCase):
                 "The value of 'raw_id_fields[0]' refers to 'nonexistent', "
                 "which is not a field of 'admin_checks.Album'.",
                 obj=RawIdNonexistentAdmin,
-                id='admin.E002',
+                id="admin.E002",
             )
         ]
         self.assertEqual(errors, expected)
@@ -631,6 +663,7 @@ class SystemChecksTestCase(SimpleTestCase):
         given) make sure fk_name is honored or things blow up when there is more
         than one fk to the parent model.
         """
+
         class TwoAlbumFKAndAnEInline(admin.TabularInline):
             model = TwoAlbumFKAndAnE
             exclude = ("e",)
@@ -656,7 +689,7 @@ class SystemChecksTestCase(SimpleTestCase):
                 "to 'admin_checks.Album'. You must specify a 'fk_name' "
                 "attribute.",
                 obj=TwoAlbumFKAndAnEInline,
-                id='admin.E202',
+                id="admin.E202",
             )
         ]
         self.assertEqual(errors, expected)
@@ -719,9 +752,11 @@ class SystemChecksTestCase(SimpleTestCase):
 
             def __getattr__(self, item):
                 if item == "dynamic_method":
+
                     @admin.display
                     def method(obj):
                         pass
+
                     return method
                 raise AttributeError
 
@@ -745,7 +780,7 @@ class SystemChecksTestCase(SimpleTestCase):
                 "The value of 'readonly_fields[1]' is not a callable, an attribute "
                 "of 'SongAdmin', or an attribute of 'admin_checks.Song'.",
                 obj=SongAdmin,
-                id='admin.E035',
+                id="admin.E035",
             )
         ]
         self.assertEqual(errors, expected)
@@ -753,7 +788,7 @@ class SystemChecksTestCase(SimpleTestCase):
     def test_nonexistent_field_on_inline(self):
         class CityInline(admin.TabularInline):
             model = City
-            readonly_fields = ['i_dont_exist']  # Missing attribute
+            readonly_fields = ["i_dont_exist"]  # Missing attribute
 
         errors = CityInline(State, AdminSite()).check()
         expected = [
@@ -761,22 +796,25 @@ class SystemChecksTestCase(SimpleTestCase):
                 "The value of 'readonly_fields[0]' is not a callable, an attribute "
                 "of 'CityInline', or an attribute of 'admin_checks.City'.",
                 obj=CityInline,
-                id='admin.E035',
+                id="admin.E035",
             )
         ]
         self.assertEqual(errors, expected)
 
     def test_readonly_fields_not_list_or_tuple(self):
         class SongAdmin(admin.ModelAdmin):
-            readonly_fields = 'test'
+            readonly_fields = "test"
 
-        self.assertEqual(SongAdmin(Song, AdminSite()).check(), [
-            checks.Error(
-                "The value of 'readonly_fields' must be a list or tuple.",
-                obj=SongAdmin,
-                id='admin.E034',
-            )
-        ])
+        self.assertEqual(
+            SongAdmin(Song, AdminSite()).check(),
+            [
+                checks.Error(
+                    "The value of 'readonly_fields' must be a list or tuple.",
+                    obj=SongAdmin,
+                    id="admin.E034",
+                )
+            ],
+        )
 
     def test_extra(self):
         class SongAdmin(admin.ModelAdmin):
@@ -802,8 +840,9 @@ class SystemChecksTestCase(SimpleTestCase):
         specifies the 'through' option is included in the 'fields' or the 'fieldsets'
         ModelAdmin options.
         """
+
         class BookAdmin(admin.ModelAdmin):
-            fields = ['authors']
+            fields = ["authors"]
 
         errors = BookAdmin(Book, AdminSite()).check()
         expected = [
@@ -811,7 +850,7 @@ class SystemChecksTestCase(SimpleTestCase):
                 "The value of 'fields' cannot include the ManyToManyField 'authors', "
                 "because that field manually specifies a relationship model.",
                 obj=BookAdmin,
-                id='admin.E013',
+                id="admin.E013",
             )
         ]
         self.assertEqual(errors, expected)
@@ -819,8 +858,8 @@ class SystemChecksTestCase(SimpleTestCase):
     def test_cannot_include_through(self):
         class FieldsetBookAdmin(admin.ModelAdmin):
             fieldsets = (
-                ('Header 1', {'fields': ('name',)}),
-                ('Header 2', {'fields': ('authors',)}),
+                ("Header 1", {"fields": ("name",)}),
+                ("Header 2", {"fields": ("authors",)}),
             )
 
         errors = FieldsetBookAdmin(Book, AdminSite()).check()
@@ -829,23 +868,21 @@ class SystemChecksTestCase(SimpleTestCase):
                 "The value of 'fieldsets[1][1][\"fields\"]' cannot include the ManyToManyField "
                 "'authors', because that field manually specifies a relationship model.",
                 obj=FieldsetBookAdmin,
-                id='admin.E013',
+                id="admin.E013",
             )
         ]
         self.assertEqual(errors, expected)
 
     def test_nested_fields(self):
         class NestedFieldsAdmin(admin.ModelAdmin):
-            fields = ('price', ('name', 'subtitle'))
+            fields = ("price", ("name", "subtitle"))
 
         errors = NestedFieldsAdmin(Book, AdminSite()).check()
         self.assertEqual(errors, [])
 
     def test_nested_fieldsets(self):
         class NestedFieldsetAdmin(admin.ModelAdmin):
-            fieldsets = (
-                ('Main', {'fields': ('price', ('name', 'subtitle'))}),
-            )
+            fieldsets = (("Main", {"fields": ("price", ("name", "subtitle"))}),)
 
         errors = NestedFieldsetAdmin(Book, AdminSite()).check()
         self.assertEqual(errors, [])
@@ -856,6 +893,7 @@ class SystemChecksTestCase(SimpleTestCase):
         is specified as a string, the admin should still be able use
         Model.m2m_field.through
         """
+
         class AuthorsInline(admin.TabularInline):
             model = Book.authors.through
 
@@ -870,12 +908,13 @@ class SystemChecksTestCase(SimpleTestCase):
         Regression for ensuring ModelAdmin.fields can contain non-model fields
         that broke with r11737
         """
+
         class SongForm(forms.ModelForm):
             extra_data = forms.CharField()
 
         class FieldsOnFormOnlyAdmin(admin.ModelAdmin):
             form = SongForm
-            fields = ['title', 'extra_data']
+            fields = ["title", "extra_data"]
 
         errors = FieldsOnFormOnlyAdmin(Song, AdminSite()).check()
         self.assertEqual(errors, [])
@@ -885,30 +924,31 @@ class SystemChecksTestCase(SimpleTestCase):
         Regression for ensuring ModelAdmin.field can handle first elem being a
         non-model field (test fix for UnboundLocalError introduced with r16225).
         """
+
         class SongForm(forms.ModelForm):
             extra_data = forms.CharField()
 
             class Meta:
                 model = Song
-                fields = '__all__'
+                fields = "__all__"
 
         class FieldsOnFormOnlyAdmin(admin.ModelAdmin):
             form = SongForm
-            fields = ['extra_data', 'title']
+            fields = ["extra_data", "title"]
 
         errors = FieldsOnFormOnlyAdmin(Song, AdminSite()).check()
         self.assertEqual(errors, [])
 
     def test_check_sublists_for_duplicates(self):
         class MyModelAdmin(admin.ModelAdmin):
-            fields = ['state', ['state']]
+            fields = ["state", ["state"]]
 
         errors = MyModelAdmin(Song, AdminSite()).check()
         expected = [
             checks.Error(
                 "The value of 'fields' contains duplicate field(s).",
                 obj=MyModelAdmin,
-                id='admin.E006'
+                id="admin.E006",
             )
         ]
         self.assertEqual(errors, expected)
@@ -916,9 +956,7 @@ class SystemChecksTestCase(SimpleTestCase):
     def test_check_fieldset_sublists_for_duplicates(self):
         class MyModelAdmin(admin.ModelAdmin):
             fieldsets = [
-                (None, {
-                    'fields': ['title', 'album', ('title', 'album')]
-                }),
+                (None, {"fields": ["title", "album", ("title", "album")]}),
             ]
 
         errors = MyModelAdmin(Song, AdminSite()).check()
@@ -926,7 +964,7 @@ class SystemChecksTestCase(SimpleTestCase):
             checks.Error(
                 "There are duplicate field(s) in 'fieldsets[0][1]'.",
                 obj=MyModelAdmin,
-                id='admin.E012'
+                id="admin.E012",
             )
         ]
         self.assertEqual(errors, expected)
@@ -936,8 +974,9 @@ class SystemChecksTestCase(SimpleTestCase):
         Ensure list_filter can access reverse fields even when the app registry
         is not ready; refs #24146.
         """
+
         class BookAdminWithListFilter(admin.ModelAdmin):
-            list_filter = ['authorsbooks__featured']
+            list_filter = ["authorsbooks__featured"]
 
         # Temporarily pretending apps are not ready yet. This issue can happen
         # if the value of 'list_filter' refers to a 'through__field'.