diff --git a/server/openslides/assignments/migrations/0009_voting_2.py b/server/openslides/assignments/migrations/0009_voting_2.py
index fc5d1501c..4da076bd8 100644
--- a/server/openslides/assignments/migrations/0009_voting_2.py
+++ b/server/openslides/assignments/migrations/0009_voting_2.py
@@ -6,7 +6,7 @@ from django.db import migrations, transaction
 
 
 def change_pollmethods(apps, schema_editor):
-    """ yn->YN, yna->YNA """
+    """yn->YN, yna->YNA"""
     AssignmentPoll = apps.get_model("assignments", "AssignmentPoll")
     pollmethod_map = {
         "yn": "YN",
@@ -113,7 +113,7 @@ def convert_votesno(apps, schema_editor):
 
 
 def set_correct_state(apps, schema_editor):
-    """ if poll.published, set state to published """
+    """if poll.published, set state to published"""
     AssignmentPoll = apps.get_model("assignments", "AssignmentPoll")
     AssignmentVote = apps.get_model("assignments", "AssignmentVote")
     for poll in AssignmentPoll.objects.all():
diff --git a/server/openslides/assignments/serializers.py b/server/openslides/assignments/serializers.py
index 7bcca9043..b567e2182 100644
--- a/server/openslides/assignments/serializers.py
+++ b/server/openslides/assignments/serializers.py
@@ -106,7 +106,7 @@ class AssignmentPollSerializer(BasePollSerializer):
         read_only_fields = ("state",)
 
     def update(self, instance, validated_data):
-        """ Prevent updating the assignment """
+        """Prevent updating the assignment"""
         validated_data.pop("assignment", None)
         return super().update(instance, validated_data)
 
diff --git a/server/openslides/mediafiles/config.py b/server/openslides/mediafiles/config.py
index cb42ba88d..73c9f60b9 100644
--- a/server/openslides/mediafiles/config.py
+++ b/server/openslides/mediafiles/config.py
@@ -23,7 +23,7 @@ def watch_and_update_configs():
 
 
 def build_mapping(base_config_key, mediafiles):
-    """ Returns a map of config keys to medaifile ids """
+    """Returns a map of config keys to medaifile ids"""
     logos = {}
     for key in config[base_config_key]:
         url = config[key]["path"]
diff --git a/server/openslides/mediafiles/models.py b/server/openslides/mediafiles/models.py
index 4c2291c2b..735a5fb6a 100644
--- a/server/openslides/mediafiles/models.py
+++ b/server/openslides/mediafiles/models.py
@@ -169,11 +169,11 @@ class Mediafile(RESTModelMixin, ListOfSpeakersMixin, models.Model):
         return deleted_ids
 
     def _db_delete(self, *args, **kwargs):
-        """ Captures the original .delete() method. """
+        """Captures the original .delete() method."""
         return super().delete(*args, **kwargs)
 
     def get_children_deep(self):
-        """ Returns all children and all children of childrens and so forth. """
+        """Returns all children and all children of childrens and so forth."""
         children = []
         for child in self.children.all():
             children.append(child)
@@ -257,7 +257,7 @@ class Mediafile(RESTModelMixin, ListOfSpeakersMixin, models.Model):
 
     @property
     def is_file(self):
-        """ Do not check the self.mediafile, becuase this is not a valid indicator. """
+        """Do not check the self.mediafile, becuase this is not a valid indicator."""
         return not self.is_directory
 
     def get_list_of_speakers_title_information(self):
diff --git a/server/openslides/motions/migrations/0011_motion_version_3.py b/server/openslides/motions/migrations/0011_motion_version_3.py
index fb803ad3d..19ab758fc 100644
--- a/server/openslides/motions/migrations/0011_motion_version_3.py
+++ b/server/openslides/motions/migrations/0011_motion_version_3.py
@@ -4,7 +4,7 @@ from django.db import migrations
 
 
 class Migration(migrations.Migration):
-    """ Cleanup 1 """
+    """Cleanup 1"""
 
     dependencies = [("motions", "0011_motion_version_2")]
 
diff --git a/server/openslides/motions/migrations/0011_motion_version_4.py b/server/openslides/motions/migrations/0011_motion_version_4.py
index 9855ac4d3..ed40c1785 100644
--- a/server/openslides/motions/migrations/0011_motion_version_4.py
+++ b/server/openslides/motions/migrations/0011_motion_version_4.py
@@ -5,7 +5,7 @@ from django.db import migrations, models
 
 
 class Migration(migrations.Migration):
-    """ Cleanup 2 """
+    """Cleanup 2"""
 
     dependencies = [("motions", "0011_motion_version_3")]
 
diff --git a/server/openslides/motions/migrations/0021_state_access_level_1.py b/server/openslides/motions/migrations/0021_state_access_level_1.py
index 8900e6c3d..32b341719 100644
--- a/server/openslides/motions/migrations/0021_state_access_level_1.py
+++ b/server/openslides/motions/migrations/0021_state_access_level_1.py
@@ -4,7 +4,7 @@ from django.db import migrations, models
 
 
 class Migration(migrations.Migration):
-    """ Note: this is a combined migration to execute code in a seperate transaction """
+    """Note: this is a combined migration to execute code in a seperate transaction"""
 
     dependencies = [("motions", "0020_auto_20190119_1425")]
 
diff --git a/server/openslides/motions/migrations/0034_voting_2.py b/server/openslides/motions/migrations/0034_voting_2.py
index 1fb620d86..6c56ae47c 100644
--- a/server/openslides/motions/migrations/0034_voting_2.py
+++ b/server/openslides/motions/migrations/0034_voting_2.py
@@ -4,7 +4,7 @@ from django.db import migrations
 
 
 def change_pollmethods(apps, schema_editor):
-    """ yn->YN, yna->YNA """
+    """yn->YN, yna->YNA"""
     MotionPoll = apps.get_model("motions", "MotionPoll")
     pollmethod_map = {
         "yn": "YN",
@@ -83,7 +83,7 @@ def convert_votes(apps, schema_editor):
 
 
 def set_correct_state(apps, schema_editor):
-    """ If there are votes, set the state to finished """
+    """If there are votes, set the state to finished"""
     MotionPoll = apps.get_model("motions", "MotionPoll")
     MotionVote = apps.get_model("motions", "MotionVote")
     for poll in MotionPoll.objects.all():
diff --git a/server/openslides/motions/models.py b/server/openslides/motions/models.py
index fdbb4be66..7cb3dbe7f 100644
--- a/server/openslides/motions/models.py
+++ b/server/openslides/motions/models.py
@@ -1057,7 +1057,7 @@ class State(RESTModelMixin, models.Model):
                 )
 
     def is_next_or_previous_state_id(self, state_id):
-        """ Returns true, if the given state id is a valid next or previous state """
+        """Returns true, if the given state id is a valid next or previous state"""
         next_state_ids = [item.id for item in self.next_states.all()]
         previous_state_ids = [
             item.id for item in State.objects.filter(next_states__in=[self.id])
diff --git a/server/openslides/motions/serializers.py b/server/openslides/motions/serializers.py
index 631bf47aa..c2ab73eea 100644
--- a/server/openslides/motions/serializers.py
+++ b/server/openslides/motions/serializers.py
@@ -256,7 +256,7 @@ class MotionPollSerializer(BasePollSerializer):
         read_only_fields = ("state",)
 
     def update(self, instance, validated_data):
-        """ Prevent updating the motion """
+        """Prevent updating the motion"""
         validated_data.pop("motion", None)
         return super().update(instance, validated_data)
 
@@ -320,7 +320,7 @@ class MotionCommentSectionSerializer(ModelSerializer):
         read_only_fields = ("weight",)
 
     def create(self, validated_data):
-        """ Call inform_changed_data on creation, so the cache includes the groups. """
+        """Call inform_changed_data on creation, so the cache includes the groups."""
         section = super().create(validated_data)
         inform_changed_data(section)
         return section
diff --git a/server/openslides/poll/models.py b/server/openslides/poll/models.py
index a72e43617..0bb3d3819 100644
--- a/server/openslides/poll/models.py
+++ b/server/openslides/poll/models.py
@@ -15,7 +15,7 @@ from ..utils.models import SET_NULL_AND_AUTOUPDATE
 
 
 def generate_user_token():
-    """ Generates a 16 character alphanumeric token. """
+    """Generates a 16 character alphanumeric token."""
     return get_random_string(16)
 
 
@@ -215,7 +215,7 @@ class BasePoll(models.Model):
         abstract = True
 
     def create_options(self):
-        """ Should be called after creation of this model. """
+        """Should be called after creation of this model."""
         raise NotImplementedError()
 
     @classmethod
diff --git a/server/openslides/poll/views.py b/server/openslides/poll/views.py
index ca82542b7..d979fcbf4 100644
--- a/server/openslides/poll/views.py
+++ b/server/openslides/poll/views.py
@@ -316,7 +316,7 @@ class BasePollViewSet(ModelViewSet):
                 raise ValidationError({"detail": "You have already voted."})
 
     def parse_vote_value(self, obj, key):
-        """ Raises a ValidationError on incorrect values, including None """
+        """Raises a ValidationError on incorrect values, including None"""
         if key not in obj:
             raise ValidationError({"detail": f"The field {key} is required"})
         field = DecimalField(min_value=-2, max_digits=15, decimal_places=6)
diff --git a/server/openslides/saml/views.py b/server/openslides/saml/views.py
index cd6e14e8c..fa1ce69c7 100644
--- a/server/openslides/saml/views.py
+++ b/server/openslides/saml/views.py
@@ -32,7 +32,7 @@ class SamlView(View):
         return super().__init__(*args, **kwargs)
 
     def post(self, request, *args, **kwargs):
-        """ POST requests should do the same as GET requests. """
+        """POST requests should do the same as GET requests."""
         return self.get(request, *args, **kwargs)
 
     def get(self, request, *args, **kwargs):
@@ -183,7 +183,7 @@ class SamlView(View):
         return queryargs
 
     def update_user(self, user, attributes):
-        """ Updates a user with the new attributes """
+        """Updates a user with the new attributes"""
         if "auth_type" in attributes:
             del attributes["auth_type"]
 
diff --git a/server/openslides/users/user_backend.py b/server/openslides/users/user_backend.py
index 100294316..43b72caee 100644
--- a/server/openslides/users/user_backend.py
+++ b/server/openslides/users/user_backend.py
@@ -30,7 +30,7 @@ class BaseUserBackend:
 
 
 class DefaultUserBackend(BaseUserBackend):
-    """ The default user backend for OpenSlides """
+    """The default user backend for OpenSlides"""
 
     @property
     def name(self) -> str:
@@ -51,14 +51,14 @@ class UserBackendManager:
         self.backends: Dict[str, BaseUserBackend] = {}
 
     def collect_backends_from_apps(self):
-        """ Iterate through app configs and get an optional "user_backend_class" for a backend """
+        """Iterate through app configs and get an optional "user_backend_class" for a backend"""
         for app in apps.get_app_configs():
             user_backend_class = getattr(app, "user_backend_class", None)
             if user_backend_class:
                 self.register_user_backend(user_backend_class())
 
     def register_user_backend(self, backend: BaseUserBackend):
-        """ Registeres a user backend """
+        """Registeres a user backend"""
         if backend.name in self.backends:
             raise UserBackendException(
                 f"The user backend {backend.name} already exists."
@@ -75,7 +75,7 @@ class UserBackendManager:
         return self.backends[name]
 
     def get_backends_for_client(self) -> Dict[str, Dict[str, Any]]:
-        """ Formats the backends for the client """
+        """Formats the backends for the client"""
         return {name: backend.for_client() for name, backend in self.backends.items()}
 
 
diff --git a/server/openslides/users/views.py b/server/openslides/users/views.py
index 3b15c99c4..95583c7a5 100644
--- a/server/openslides/users/views.py
+++ b/server/openslides/users/views.py
@@ -554,7 +554,7 @@ class UserViewSet(ModelViewSet):
         )
 
     def assert_list_of_ints(self, ids, ids_name="user_ids"):
-        """ Asserts, that ids is a list of ints. Raises a ValidationError, if not. """
+        """Asserts, that ids is a list of ints. Raises a ValidationError, if not."""
         if not isinstance(ids, list):
             raise ValidationError({"detail": "{0} must be a list", "args": [ids_name]})
         for id in ids:
diff --git a/server/openslides/utils/autoupdate.py b/server/openslides/utils/autoupdate.py
index 6b34d5e37..00b1c5929 100644
--- a/server/openslides/utils/autoupdate.py
+++ b/server/openslides/utils/autoupdate.py
@@ -20,7 +20,6 @@ AutoupdateFormat = TypedDict(
 
 
 def disable_history() -> None:
-    """"""
     with autoupdate_bundle() as bundle:
         bundle.disable_history()
 
diff --git a/server/openslides/utils/autoupdate_bundle.py b/server/openslides/utils/autoupdate_bundle.py
index 2c5668524..5f64fc215 100644
--- a/server/openslides/utils/autoupdate_bundle.py
+++ b/server/openslides/utils/autoupdate_bundle.py
@@ -56,7 +56,7 @@ class AutoupdateBundle:
         self._disable_history = False
 
     def add(self, elements: Iterable[AutoupdateElement]) -> None:
-        """ Adds the elements to the bundle """
+        """Adds the elements to the bundle"""
         for element in elements:
             self.autoupdate_elements[element["collection_string"]][
                 element["id"]
@@ -103,7 +103,7 @@ class AutoupdateBundle:
 
     @property
     def element_iterator(self) -> Iterable[AutoupdateElement]:
-        """ Iterator for all elements in this bundle """
+        """Iterator for all elements in this bundle"""
         for elements in self.autoupdate_elements.values():
             yield from elements.values()
 
diff --git a/server/openslides/utils/cache_providers.py b/server/openslides/utils/cache_providers.py
index d26041af6..b5d2ad65e 100644
--- a/server/openslides/utils/cache_providers.py
+++ b/server/openslides/utils/cache_providers.py
@@ -424,7 +424,7 @@ class RedisCacheProvider:
         return value
 
     async def get_schema_version(self) -> Optional[SchemaVersion]:
-        """ Retrieves the schema version of the cache or None, if not existent """
+        """Retrieves the schema version of the cache or None, if not existent"""
         async with get_connection(read_only=True) as redis:
             try:
                 schema_version = await redis.hgetall(self.schema_cache_key)
@@ -441,7 +441,7 @@ class RedisCacheProvider:
         }
 
     async def set_schema_version(self, schema_version: SchemaVersion) -> None:
-        """ Sets the schema version for this cache. """
+        """Sets the schema version for this cache."""
         async with get_connection() as redis:
             await redis.hmset_dict(self.schema_cache_key, schema_version)
 
@@ -483,7 +483,7 @@ class RedisCacheProvider:
     async def _eval(
         self, redis: Any, script_name: str, keys: List[str] = [], args: List[Any] = []
     ) -> Any:
-        """ Do a real eval of the script (no hash used here). Catches "cache_reset". """
+        """Do a real eval of the script (no hash used here). Catches "cache_reset"."""
         try:
             return await redis.eval(self.scripts[script_name][0], keys, args)
         except aioredis.errors.ReplyError as e:
diff --git a/server/openslides/utils/redis_connection_pool.py b/server/openslides/utils/redis_connection_pool.py
index 48042907e..f050a3098 100644
--- a/server/openslides/utils/redis_connection_pool.py
+++ b/server/openslides/utils/redis_connection_pool.py
@@ -142,7 +142,7 @@ class InvalidConnection(Exception):
 
 
 class ConnectionPool(ChannelRedisConnectionPool):
-    """ Adds a trivial, soft limit for the pool """
+    """Adds a trivial, soft limit for the pool"""
 
     def __init__(self, host: Any) -> None:
         self.counter = 0
diff --git a/server/openslides/utils/stats.py b/server/openslides/utils/stats.py
index ff4eba54e..4d0022833 100644
--- a/server/openslides/utils/stats.py
+++ b/server/openslides/utils/stats.py
@@ -28,7 +28,7 @@ class WebsocketLatencyLogger:
 
     @classmethod
     async def add_latency(cls, latency: int) -> None:
-        """ Add the latency to the logger. """
+        """Add the latency to the logger."""
         # pass the latency value to the single instance
         if cls.instance is None:
             cls.instance = cls()
@@ -49,7 +49,7 @@ class WebsocketLatencyLogger:
                 self.flush()
 
     def flush(self) -> None:
-        """ Calc Stats and print to logger. """
+        """Calc Stats and print to logger."""
         N = len(self.latencies)
         mean = sum(self.latencies) / N
         std = sum((latency - mean) ** 2 for latency in self.latencies)
@@ -58,7 +58,7 @@ class WebsocketLatencyLogger:
         self.reset()
 
     def reset(self) -> None:
-        """ Resets the stats. """
+        """Resets the stats."""
         self.latencies: List[int] = []
         self.time = time.time()
 
@@ -131,7 +131,7 @@ class WebsocketThroughputLogger:
             self.reset()
 
     def reset(self) -> None:
-        """ Resets the stats. """
+        """Resets the stats."""
         self.send_compressed = 0
         self.send_uncompressed = 0
         self.receive_compressed = 0
diff --git a/server/tests/integration/mediafiles/test_viewset.py b/server/tests/integration/mediafiles/test_viewset.py
index 706570ef4..be9cf0d22 100644
--- a/server/tests/integration/mediafiles/test_viewset.py
+++ b/server/tests/integration/mediafiles/test_viewset.py
@@ -266,7 +266,7 @@ class TestUpdate(TestCase):
         )
 
     def test_update_parent_id(self):
-        """ Assert, that the parent id does not change """
+        """Assert, that the parent id does not change"""
         response = self.client.put(
             reverse("mediafile-detail", args=[self.mediafileA.pk]),
             {"title": self.mediafileA.title, "parent_id": None},
diff --git a/server/tests/integration/motions/test_polls.py b/server/tests/integration/motions/test_polls.py
index 730f9505e..60063b628 100644
--- a/server/tests/integration/motions/test_polls.py
+++ b/server/tests/integration/motions/test_polls.py
@@ -881,7 +881,7 @@ class VoteMotionPollNamed(TestCase):
         self.assertFalse(MotionPoll.objects.get().get_votes().exists())
 
     def setup_vote_delegation(self, with_delegation=True):
-        """ user -> admin """
+        """user -> admin"""
         self.start_poll()
         self.make_admin_delegate()
         self.make_admin_present()
@@ -1392,7 +1392,7 @@ class ResetMotionPoll(TestCase):
 
 class TestMotionPollWithVoteDelegationAutoupdate(TestCase):
     def advancedSetUp(self):
-        """ Set up user -> other_user delegation. """
+        """Set up user -> other_user delegation."""
         self.motion = Motion(
             title="test_title_dL91JqhMTiQuQLSDRItZ",
             text="test_text_R7nURdXKVEfEnnJBXJYa",
diff --git a/server/tests/integration/motions/test_viewset.py b/server/tests/integration/motions/test_viewset.py
index ca16ff18e..bfa6702da 100644
--- a/server/tests/integration/motions/test_viewset.py
+++ b/server/tests/integration/motions/test_viewset.py
@@ -660,7 +660,7 @@ class TestMotionCommentSectionSorting(TestCase):
         self.assert_not_changed()
 
     def assert_not_changed(self):
-        """ Asserts, that every comment section has the default weight of 10000. """
+        """Asserts, that every comment section has the default weight of 10000."""
         for section in MotionCommentSection.objects.all():
             self.assertEqual(section.weight, 10000)
 
diff --git a/server/tests/integration/users/test_viewset.py b/server/tests/integration/users/test_viewset.py
index ab99de703..6a454b4e3 100644
--- a/server/tests/integration/users/test_viewset.py
+++ b/server/tests/integration/users/test_viewset.py
@@ -313,7 +313,7 @@ class UserUpdate(TestCase):
         self.assertIsNone(admin.vote_delegated_to_id)
 
     def setup_vote_delegation(self):
-        """ login and setup user -> user2 delegation """
+        """login and setup user -> user2 delegation"""
         self.user, _ = self.create_user()
         self.user2, _ = self.create_user()
         self.user.vote_delegated_to = self.user2
@@ -354,7 +354,7 @@ class UserUpdate(TestCase):
         self.assertEqual(user.vote_delegated_to_id, self.user2.id)
 
     def test_update_nested_vote_delegation_1(self):
-        """ user -> user2 -> admin """
+        """user -> user2 -> admin"""
         self.setup_vote_delegation()
         response = self.client.patch(
             reverse("user-detail", args=[self.user2.pk]),
@@ -366,7 +366,7 @@ class UserUpdate(TestCase):
         self.assertIsNone(user2.vote_delegated_to_id)
 
     def test_update_nested_vote_delegation_2(self):
-        """ admin -> user -> user2 """
+        """admin -> user -> user2"""
         self.setup_vote_delegation()
         response = self.client.patch(
             reverse("user-detail", args=[self.admin.pk]),
@@ -391,7 +391,7 @@ class UserUpdate(TestCase):
         self.assertIsNone(user.vote_delegated_to_id)
 
     def test_update_vote_delegated_from_nested_1(self):
-        """ admin -> user -> user2 """
+        """admin -> user -> user2"""
         self.setup_vote_delegation()
         response = self.client.patch(
             reverse("user-detail", args=[self.user.pk]),
@@ -403,7 +403,7 @@ class UserUpdate(TestCase):
         self.assertIsNone(admin.vote_delegated_to_id)
 
     def test_update_vote_delegated_from_nested_2(self):
-        """ user -> user2 -> admin """
+        """user -> user2 -> admin"""
         self.setup_vote_delegation()
         response = self.client.patch(
             reverse("user-detail", args=[self.admin.pk]),
@@ -415,7 +415,7 @@ class UserUpdate(TestCase):
         self.assertIsNone(user2.vote_delegated_to_id)
 
     def test_update_vote_delegation_both_1(self):
-        """ Change user -> user2 to admin -> user in one request. """
+        """Change user -> user2 to admin -> user in one request."""
         self.user2 = User.objects.create_user(
             username="user2",
             password="non-admin 1WywRnqKbcdtQwS2",
@@ -446,7 +446,7 @@ class UserUpdate(TestCase):
         self.assertEqual(user2.vote_delegated_from_users.count(), 0)
 
     def test_update_vote_delegation_both_2(self):
-        """ Change user -> user2 to user2 -> admin in one request. """
+        """Change user -> user2 to user2 -> admin in one request."""
         self.user2 = User.objects.create_user(
             username="user2",
             password="non-admin 1WywRnqKbcdtQwS2",
@@ -519,7 +519,7 @@ class UserDelete(TestCase):
         self.assertFalse(User.objects.filter(pk__in=ids).exists())
 
     def test_bulk_delete_self(self):
-        """ The own id should be excluded, so nothing should happen. """
+        """The own id should be excluded, so nothing should happen."""
         response = self.admin_client.post(
             reverse("user-bulk-delete"), {"user_ids": [1]}
         )