From 4b526bcf5f8270b3327ef453df007559c76b320c Mon Sep 17 00:00:00 2001
From: Dimitri Papadopoulos
 <3234522+DimitriPapadopoulos@users.noreply.github.com>
Date: Sun, 8 Mar 2026 12:49:37 +0100
Subject: [PATCH 1/2] Enforce ruff/isort rules (I)

---
 pyproject.toml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pyproject.toml b/pyproject.toml
index 13931d945..56ef74fbf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -140,6 +140,7 @@ extend-select = [
     "PIE",
     "PYI",
     "FLY",
+    "I",
     "UP",
 ]
 ignore = [

From 65638a429b3b8d762423a43c8412fe58feb10015 Mon Sep 17 00:00:00 2001
From: Dimitri Papadopoulos
 <3234522+DimitriPapadopoulos@users.noreply.github.com>
Date: Sun, 8 Mar 2026 12:50:46 +0100
Subject: [PATCH 2/2] Apply ruff/isort rule I001

Import block is un-sorted or un-formatted
---
 pynetdicom/__init__.py               | 10 ++--
 pynetdicom/_config.py                |  2 +-
 pynetdicom/_handlers.py              | 43 ++++++++-------
 pynetdicom/_version.py               |  2 +-
 pynetdicom/acse.py                   |  8 +--
 pynetdicom/ae.py                     | 32 +++++------
 pynetdicom/apps/common.py            |  2 +-
 pynetdicom/apps/echoscp/echoscp.py   |  4 +-
 pynetdicom/apps/echoscu/echoscu.py   |  6 +--
 pynetdicom/apps/findscu/findscu.py   | 10 ++--
 pynetdicom/apps/getscu/getscu.py     |  6 +--
 pynetdicom/apps/movescu/movescu.py   |  8 +--
 pynetdicom/apps/qrscp/db.py          | 11 ++--
 pynetdicom/apps/qrscp/handlers.py    |  3 +-
 pynetdicom/apps/qrscp/qrscp.py       | 33 ++++++------
 pynetdicom/apps/storescp/storescp.py |  6 +--
 pynetdicom/apps/storescu/storescu.py |  8 +--
 pynetdicom/association.py            | 80 ++++++++++++++--------------
 pynetdicom/dimse.py                  | 38 +++++++------
 pynetdicom/dimse_messages.py         | 18 +++----
 pynetdicom/dimse_primitives.py       |  8 +--
 pynetdicom/dsutils.py                |  6 +--
 pynetdicom/dul.py                    | 14 ++---
 pynetdicom/events.py                 | 12 ++---
 pynetdicom/fsm.py                    | 16 +++---
 pynetdicom/pdu.py                    | 18 +++----
 pynetdicom/pdu_items.py              | 16 +++---
 pynetdicom/pdu_primitives.py         | 15 +++---
 pynetdicom/presentation.py           |  4 +-
 pynetdicom/service_class.py          | 38 ++++++-------
 pynetdicom/service_class_n.py        |  6 +--
 pynetdicom/sop_class.py              |  2 +-
 pynetdicom/status.py                 |  6 +--
 pynetdicom/transport.py              | 12 ++---
 pynetdicom/utils.py                  |  6 +--
 35 files changed, 253 insertions(+), 256 deletions(-)

diff --git a/pynetdicom/__init__.py b/pynetdicom/__init__.py
index 3462c9257..c8b046ebd 100644
--- a/pynetdicom/__init__.py
+++ b/pynetdicom/__init__.py
@@ -42,15 +42,13 @@
 # Convenience imports
 # ruff: noqa: E402,F401
 from pynetdicom import events as evt
-from pynetdicom.ae import ApplicationEntity as AE
-from pynetdicom.association import Association
 from pynetdicom._globals import (
     ALL_TRANSFER_SYNTAXES,
     DEFAULT_TRANSFER_SYNTAXES,
 )
+from pynetdicom.ae import ApplicationEntity as AE
+from pynetdicom.association import Association
 from pynetdicom.presentation import (
-    build_context,
-    build_role,
     AllStoragePresentationContexts,
     ApplicationEventLoggingPresentationContexts,
     BasicWorklistManagementPresentationContexts,
@@ -70,11 +68,13 @@
     QueryRetrievePresentationContexts,
     RelevantPatientInformationPresentationContexts,
     RTMachineVerificationPresentationContexts,
-    StoragePresentationContexts,
     StorageCommitmentPresentationContexts,
+    StoragePresentationContexts,
     SubstanceAdministrationPresentationContexts,
     UnifiedProcedurePresentationContexts,
     VerificationPresentationContexts,
+    build_context,
+    build_role,
 )
 from pynetdicom.sop_class import register_uid
 
diff --git a/pynetdicom/_config.py b/pynetdicom/_config.py
index 0bda84882..de44cfc1b 100644
--- a/pynetdicom/_config.py
+++ b/pynetdicom/_config.py
@@ -1,7 +1,7 @@
 """pynetdicom configuration options"""
 
-from typing import Any
 from collections.abc import Callable
+from typing import Any
 
 from pynetdicom._validators import validate_ae, validate_ui
 
diff --git a/pynetdicom/_handlers.py b/pynetdicom/_handlers.py
index 2e32cd095..976af5fc4 100644
--- a/pynetdicom/_handlers.py
+++ b/pynetdicom/_handlers.py
@@ -1,54 +1,57 @@
 """Standard logging event handlers."""
 
 import logging
-from struct import unpack, calcsize
-from typing import TYPE_CHECKING, cast, Any
-from collections.abc import Sequence, Iterator
+from collections.abc import Iterator, Sequence
+from struct import calcsize, unpack
+from typing import TYPE_CHECKING, Any, cast
 
 from pydicom.dataset import Dataset
 from pydicom.uid import UID
 
 from pynetdicom.dimse_messages import (
-    C_STORE_RQ,
-    C_STORE_RSP,
+    C_CANCEL_RQ,
+    C_ECHO_RQ,
+    C_ECHO_RSP,
     C_FIND_RQ,
     C_FIND_RSP,
     C_GET_RQ,
     C_GET_RSP,
     C_MOVE_RQ,
     C_MOVE_RSP,
-    C_ECHO_RQ,
-    C_ECHO_RSP,
-    C_CANCEL_RQ,
-    N_EVENT_REPORT_RQ,
-    N_EVENT_REPORT_RSP,
-    N_GET_RQ,
-    N_GET_RSP,
-    N_SET_RQ,
-    N_SET_RSP,
+    C_STORE_RQ,
+    C_STORE_RSP,
     N_ACTION_RQ,
     N_ACTION_RSP,
     N_CREATE_RQ,
     N_CREATE_RSP,
     N_DELETE_RQ,
     N_DELETE_RSP,
+    N_EVENT_REPORT_RQ,
+    N_EVENT_REPORT_RSP,
+    N_GET_RQ,
+    N_GET_RSP,
+    N_SET_RQ,
+    N_SET_RSP,
 )
 from pynetdicom.pdu import (
-    A_ASSOCIATE_RQ,
+    A_ABORT_RQ,
     A_ASSOCIATE_AC,
     A_ASSOCIATE_RJ,
-    A_RELEASE_RQ,
+    A_ASSOCIATE_RQ,
     A_RELEASE_RP,
-    A_ABORT_RQ,
+    A_RELEASE_RQ,
     P_DATA_TF,
 )
 from pynetdicom.sop_class import uid_to_service_class
-from pynetdicom.utils import pretty_bytes, decode_bytes
+from pynetdicom.utils import decode_bytes, pretty_bytes
 
 if TYPE_CHECKING:  # pragma: no cover
     from pynetdicom.events import Event
-    from pynetdicom.pdu_items import UserInformationItem, UserIdentitySubItemRQ
-    from pynetdicom.pdu_items import SOPClassCommonExtendedNegotiation
+    from pynetdicom.pdu_items import (
+        SOPClassCommonExtendedNegotiation,
+        UserIdentitySubItemRQ,
+        UserInformationItem,
+    )
 
 
 LOGGER = logging.getLogger(__name__)
diff --git a/pynetdicom/_version.py b/pynetdicom/_version.py
index 31dedc2eb..be0638655 100644
--- a/pynetdicom/_version.py
+++ b/pynetdicom/_version.py
@@ -1,7 +1,7 @@
 """Version information for pynetdicom based on PEP396 and 440"""
 
-from importlib.metadata import version
 import re
+from importlib.metadata import version
 
 # pynetdicom version
 __version__: str = version("pynetdicom")
diff --git a/pynetdicom/acse.py b/pynetdicom/acse.py
index 1f791bf28..3b87b5acf 100644
--- a/pynetdicom/acse.py
+++ b/pynetdicom/acse.py
@@ -5,21 +5,21 @@
 
 from pydicom.uid import UID
 
-from pynetdicom import evt, _config
+from pynetdicom import _config, evt
 from pynetdicom._globals import APPLICATION_CONTEXT_NAME
 from pynetdicom.pdu_primitives import (
-    A_ASSOCIATE,
-    A_RELEASE,
     A_ABORT,
+    A_ASSOCIATE,
     A_P_ABORT,
+    A_RELEASE,
     AsynchronousOperationsWindowNegotiation,
     SOPClassCommonExtendedNegotiation,
     SOPClassExtendedNegotiation,
     UserIdentityNegotiation,
 )
 from pynetdicom.presentation import (
-    negotiate_as_requestor,
     negotiate_as_acceptor,
+    negotiate_as_requestor,
     negotiate_unrestricted,
 )
 
diff --git a/pynetdicom/ae.py b/pynetdicom/ae.py
index 74fe07578..625517c80 100644
--- a/pynetdicom/ae.py
+++ b/pynetdicom/ae.py
@@ -2,39 +2,39 @@
 The main user class, represents a DICOM Application Entity
 """
 
-from copy import deepcopy
-from datetime import datetime
 import logging
 import socket
-from ssl import SSLContext
 import threading
+import warnings
+from collections.abc import Sequence
+from copy import deepcopy
+from datetime import datetime
+from ssl import SSLContext
 from typing import (
-    cast,
-    TypeVar,
     Any,
+    TypeVar,
+    cast,
 )
-from collections.abc import Sequence
-import warnings
 
 from pydicom.uid import UID
 
 from pynetdicom import _config
+from pynetdicom._globals import (
+    DEFAULT_MAX_LENGTH,
+    DEFAULT_TRANSFER_SYNTAXES,
+    MODE_REQUESTOR,
+)
 from pynetdicom.association import Association
 from pynetdicom.events import EventHandlerType
-from pynetdicom.presentation import PresentationContext
 from pynetdicom.pdu_primitives import _UI
+from pynetdicom.presentation import PresentationContext
 from pynetdicom.transport import (
-    AssociationSocket,
+    AddressInformation,
     AssociationServer,
+    AssociationSocket,
     ThreadedAssociationServer,
-    AddressInformation,
-)
-from pynetdicom.utils import make_target, set_ae, decode_bytes, set_uid
-from pynetdicom._globals import (
-    MODE_REQUESTOR,
-    DEFAULT_MAX_LENGTH,
-    DEFAULT_TRANSFER_SYNTAXES,
 )
+from pynetdicom.utils import decode_bytes, make_target, set_ae, set_uid
 
 LOGGER = logging.getLogger(__name__)
 
diff --git a/pynetdicom/apps/common.py b/pynetdicom/apps/common.py
index 4ebae4f85..d09fbc2a0 100644
--- a/pynetdicom/apps/common.py
+++ b/pynetdicom/apps/common.py
@@ -6,7 +6,7 @@
 from struct import pack
 
 from pydicom import dcmread
-from pydicom.datadict import tag_for_keyword, repeater_has_keyword, get_entry
+from pydicom.datadict import get_entry, repeater_has_keyword, tag_for_keyword
 from pydicom.dataset import Dataset
 from pydicom.tag import Tag
 from pydicom.uid import DeflatedExplicitVRLittleEndian
diff --git a/pynetdicom/apps/echoscp/echoscp.py b/pynetdicom/apps/echoscp/echoscp.py
index aebd57354..33098096b 100755
--- a/pynetdicom/apps/echoscp/echoscp.py
+++ b/pynetdicom/apps/echoscp/echoscp.py
@@ -5,14 +5,14 @@
 import sys
 
 from pydicom.uid import (
+    ExplicitVRBigEndian,
     ExplicitVRLittleEndian,
     ImplicitVRLittleEndian,
-    ExplicitVRBigEndian,
 )
 
 from pynetdicom import AE, evt
-from pynetdicom.apps.common import setup_logging
 from pynetdicom._globals import ALL_TRANSFER_SYNTAXES, DEFAULT_MAX_LENGTH
+from pynetdicom.apps.common import setup_logging
 from pynetdicom.sop_class import Verification
 
 __version__ = "0.7.0"
diff --git a/pynetdicom/apps/echoscu/echoscu.py b/pynetdicom/apps/echoscu/echoscu.py
index 1bce9ba6c..624c13651 100755
--- a/pynetdicom/apps/echoscu/echoscu.py
+++ b/pynetdicom/apps/echoscu/echoscu.py
@@ -9,15 +9,15 @@
 import sys
 
 from pydicom.uid import (
+    DeflatedExplicitVRLittleEndian,
+    ExplicitVRBigEndian,
     ExplicitVRLittleEndian,
     ImplicitVRLittleEndian,
-    ExplicitVRBigEndian,
-    DeflatedExplicitVRLittleEndian,
 )
 
 from pynetdicom import AE
-from pynetdicom.apps.common import setup_logging
 from pynetdicom._globals import DEFAULT_MAX_LENGTH
+from pynetdicom.apps.common import setup_logging
 from pynetdicom.sop_class import Verification
 
 __version__ = "0.7.0"
diff --git a/pynetdicom/apps/findscu/findscu.py b/pynetdicom/apps/findscu/findscu.py
index 47df32e45..c3fab29fc 100755
--- a/pynetdicom/apps/findscu/findscu.py
+++ b/pynetdicom/apps/findscu/findscu.py
@@ -13,22 +13,22 @@
 
 from pynetdicom import (
     AE,
-    BasicWorklistManagementPresentationContexts,
-    QueryRetrievePresentationContexts,
     PYNETDICOM_IMPLEMENTATION_UID,
     PYNETDICOM_IMPLEMENTATION_VERSION,
     PYNETDICOM_UID_PREFIX,
+    BasicWorklistManagementPresentationContexts,
+    QueryRetrievePresentationContexts,
     UnifiedProcedurePresentationContexts,
 )
-from pynetdicom.apps.common import create_dataset, setup_logging
 from pynetdicom._globals import DEFAULT_MAX_LENGTH
+from pynetdicom.apps.common import create_dataset, setup_logging
 from pynetdicom.pdu_primitives import SOPClassExtendedNegotiation
 from pynetdicom.sop_class import (
     ModalityWorklistInformationFind,
-    UnifiedProcedureStepPull,
     PatientRootQueryRetrieveInformationModelFind,
-    StudyRootQueryRetrieveInformationModelFind,
     PatientStudyOnlyQueryRetrieveInformationModelFind,
+    StudyRootQueryRetrieveInformationModelFind,
+    UnifiedProcedureStepPull,
 )
 
 __version__ = "0.2.0"
diff --git a/pynetdicom/apps/getscu/getscu.py b/pynetdicom/apps/getscu/getscu.py
index 9ea3c3c98..8bf59d7c0 100755
--- a/pynetdicom/apps/getscu/getscu.py
+++ b/pynetdicom/apps/getscu/getscu.py
@@ -9,17 +9,17 @@
 
 from pynetdicom import (
     AE,
+    StoragePresentationContexts,
     build_role,
     evt,
-    StoragePresentationContexts,
 )
-from pynetdicom.apps.common import setup_logging, create_dataset, handle_store
 from pynetdicom._globals import DEFAULT_MAX_LENGTH
+from pynetdicom.apps.common import create_dataset, handle_store, setup_logging
 from pynetdicom.pdu_primitives import SOPClassExtendedNegotiation
 from pynetdicom.sop_class import (
     PatientRootQueryRetrieveInformationModelGet,
-    StudyRootQueryRetrieveInformationModelGet,
     PatientStudyOnlyQueryRetrieveInformationModelGet,
+    StudyRootQueryRetrieveInformationModelGet,
 )
 
 __version__ = "0.4.0"
diff --git a/pynetdicom/apps/movescu/movescu.py b/pynetdicom/apps/movescu/movescu.py
index c0396b48e..7043d9be9 100755
--- a/pynetdicom/apps/movescu/movescu.py
+++ b/pynetdicom/apps/movescu/movescu.py
@@ -9,17 +9,17 @@
 
 from pynetdicom import (
     AE,
-    evt,
-    QueryRetrievePresentationContexts,
     AllStoragePresentationContexts,
+    QueryRetrievePresentationContexts,
+    evt,
 )
-from pynetdicom.apps.common import setup_logging, create_dataset, handle_store
 from pynetdicom._globals import ALL_TRANSFER_SYNTAXES, DEFAULT_MAX_LENGTH
+from pynetdicom.apps.common import create_dataset, handle_store, setup_logging
 from pynetdicom.pdu_primitives import SOPClassExtendedNegotiation
 from pynetdicom.sop_class import (
     PatientRootQueryRetrieveInformationModelMove,
-    StudyRootQueryRetrieveInformationModelMove,
     PatientStudyOnlyQueryRetrieveInformationModelMove,
+    StudyRootQueryRetrieveInformationModelMove,
 )
 
 __version__ = "0.4.0"
diff --git a/pynetdicom/apps/qrscp/db.py b/pynetdicom/apps/qrscp/db.py
index 72d71a5a0..a95c12904 100644
--- a/pynetdicom/apps/qrscp/db.py
+++ b/pynetdicom/apps/qrscp/db.py
@@ -17,26 +17,25 @@
 * Required keys shall not be in a C-GET or C-MOVE request's Identifier
 """
 
-from collections import OrderedDict
 import sys
+from collections import OrderedDict
 
 try:
-    from sqlalchemy import create_engine, Column, ForeignKey, Integer, String
+    from sqlalchemy import Column, ForeignKey, Integer, String, create_engine
 except ImportError:
     sys.exit("qrscp requires the sqlalchemy package")
 
-from sqlalchemy.orm import declarative_base
-
 from pydicom.dataset import Dataset
+from sqlalchemy.orm import declarative_base
 
 from pynetdicom import build_context
 from pynetdicom.sop_class import (
     PatientRootQueryRetrieveInformationModelFind,
-    PatientRootQueryRetrieveInformationModelMove,
     PatientRootQueryRetrieveInformationModelGet,
+    PatientRootQueryRetrieveInformationModelMove,
     StudyRootQueryRetrieveInformationModelFind,
-    StudyRootQueryRetrieveInformationModelMove,
     StudyRootQueryRetrieveInformationModelGet,
+    StudyRootQueryRetrieveInformationModelMove,
 )
 
 
diff --git a/pynetdicom/apps/qrscp/handlers.py b/pynetdicom/apps/qrscp/handlers.py
index 5874a411a..3a89f4cb3 100644
--- a/pynetdicom/apps/qrscp/handlers.py
+++ b/pynetdicom/apps/qrscp/handlers.py
@@ -3,11 +3,10 @@
 import os
 
 from pydicom import dcmread
-
 from sqlalchemy import create_engine
 from sqlalchemy.orm import sessionmaker
 
-from pynetdicom.apps.qrscp.db import add_instance, search, InvalidIdentifier, Instance
+from pynetdicom.apps.qrscp.db import Instance, InvalidIdentifier, add_instance, search
 
 
 def handle_echo(event, cli_config, logger):
diff --git a/pynetdicom/apps/qrscp/qrscp.py b/pynetdicom/apps/qrscp/qrscp.py
index 847e4e1cc..c0d029aa8 100755
--- a/pynetdicom/apps/qrscp/qrscp.py
+++ b/pynetdicom/apps/qrscp/qrscp.py
@@ -2,9 +2,9 @@
 """A Verification, Storage and Query/Retrieve SCP application."""
 
 import argparse
-from configparser import ConfigParser
 import os
 import sys
+from configparser import ConfigParser
 
 import pydicom.config
 from sqlalchemy import create_engine
@@ -12,35 +12,34 @@
 
 from pynetdicom import (
     AE,
-    _config,
-    evt,
-    _handlers,
-    AllStoragePresentationContexts,
     ALL_TRANSFER_SYNTAXES,
+    AllStoragePresentationContexts,
     UnifiedProcedurePresentationContexts,
+    _config,
+    _handlers,
+    evt,
 )
 from pynetdicom.apps.common import setup_logging
+from pynetdicom.apps.qrscp import db
+from pynetdicom.apps.qrscp.handlers import (
+    handle_echo,
+    handle_find,
+    handle_get,
+    handle_move,
+    handle_store,
+)
 from pynetdicom.sop_class import (
-    Verification,
     ModalityWorklistInformationFind,
     PatientRootQueryRetrieveInformationModelFind,
-    PatientRootQueryRetrieveInformationModelMove,
     PatientRootQueryRetrieveInformationModelGet,
+    PatientRootQueryRetrieveInformationModelMove,
     StudyRootQueryRetrieveInformationModelFind,
-    StudyRootQueryRetrieveInformationModelMove,
     StudyRootQueryRetrieveInformationModelGet,
+    StudyRootQueryRetrieveInformationModelMove,
+    Verification,
 )
 from pynetdicom.utils import set_ae
 
-from pynetdicom.apps.qrscp.handlers import (
-    handle_echo,
-    handle_find,
-    handle_get,
-    handle_move,
-    handle_store,
-)
-from pynetdicom.apps.qrscp import db
-
 # Use `None` for empty values
 pydicom.config.use_none_as_empty_text_VR_value = True
 # Don't log identifiers
diff --git a/pynetdicom/apps/storescp/storescp.py b/pynetdicom/apps/storescp/storescp.py
index 3224f48f2..ce31ca181 100755
--- a/pynetdicom/apps/storescp/storescp.py
+++ b/pynetdicom/apps/storescp/storescp.py
@@ -8,19 +8,19 @@
 import sys
 
 from pydicom.uid import (
+    ExplicitVRBigEndian,
     ExplicitVRLittleEndian,
     ImplicitVRLittleEndian,
-    ExplicitVRBigEndian,
 )
 
 from pynetdicom import (
     AE,
-    evt,
     AllStoragePresentationContexts,
     VerificationPresentationContexts,
+    evt,
 )
-from pynetdicom.apps.common import setup_logging, handle_store
 from pynetdicom._globals import ALL_TRANSFER_SYNTAXES, DEFAULT_MAX_LENGTH
+from pynetdicom.apps.common import handle_store, setup_logging
 
 __version__ = "0.6.0"
 
diff --git a/pynetdicom/apps/storescu/storescu.py b/pynetdicom/apps/storescu/storescu.py
index ff912bb7b..f20759f1c 100755
--- a/pynetdicom/apps/storescu/storescu.py
+++ b/pynetdicom/apps/storescu/storescu.py
@@ -6,21 +6,21 @@
 
 import argparse
 import os
-from pathlib import Path
 import sys
+from pathlib import Path
 
 from pydicom import dcmread
 from pydicom.errors import InvalidDicomError
 from pydicom.uid import (
+    DeflatedExplicitVRLittleEndian,
+    ExplicitVRBigEndian,
     ExplicitVRLittleEndian,
     ImplicitVRLittleEndian,
-    ExplicitVRBigEndian,
-    DeflatedExplicitVRLittleEndian,
 )
 
 from pynetdicom import AE, StoragePresentationContexts
-from pynetdicom.apps.common import setup_logging, get_files
 from pynetdicom._globals import DEFAULT_MAX_LENGTH
+from pynetdicom.apps.common import get_files, setup_logging
 
 __version__ = "0.3.0"
 
diff --git a/pynetdicom/association.py b/pynetdicom/association.py
index 415fa2a51..5bd35c16d 100644
--- a/pynetdicom/association.py
+++ b/pynetdicom/association.py
@@ -1,87 +1,87 @@
 """Defines the Association class which handles associating with peers."""
 
-from io import BytesIO
 import logging
 import os
-from pathlib import Path
 import threading
 import time
+import warnings
+from collections.abc import Callable, Iterator
+from io import BytesIO
+from pathlib import Path
 from typing import (
-    Any,
     TYPE_CHECKING,
+    Any,
     cast,
 )
-from collections.abc import Callable, Iterator
-import warnings
 
 from pydicom import dcmread
 from pydicom.dataset import Dataset
 from pydicom.tag import BaseTag
-from pydicom.uid import UID, ImplicitVRLittleEndian, ExplicitVRBigEndian
+from pydicom.uid import UID, ExplicitVRBigEndian, ImplicitVRLittleEndian
 
-from pynetdicom.acse import ACSE
 from pynetdicom import _config, evt
+from pynetdicom._globals import (
+    DEFAULT_MAX_LENGTH,
+    MODE_ACCEPTOR,
+    MODE_REQUESTOR,
+    STATUS_CANCEL,
+    STATUS_FAILURE,
+    STATUS_PENDING,
+    STATUS_SUCCESS,
+    STATUS_WARNING,
+)
+from pynetdicom._handlers import (
+    standard_dimse_recv_handler,
+    standard_dimse_sent_handler,
+    standard_pdu_recv_handler,
+    standard_pdu_sent_handler,
+)
+from pynetdicom.acse import ACSE
 from pynetdicom.dimse import DIMSEServiceProvider
 from pynetdicom.dimse_primitives import (
+    C_CANCEL,
     C_ECHO,
+    C_FIND,
+    C_GET,
     C_MOVE,
     C_STORE,
-    C_GET,
-    C_FIND,
-    C_CANCEL,
+    N_ACTION,
+    N_CREATE,
+    N_DELETE,
     N_EVENT_REPORT,
     N_GET,
     N_SET,
-    N_CREATE,
-    N_ACTION,
-    N_DELETE,
     DimseServiceType,
 )
 from pynetdicom.dsutils import decode, encode, pretty_dataset, split_dataset
 from pynetdicom.dul import DULServiceProvider
-from pynetdicom._globals import (
-    MODE_REQUESTOR,
-    MODE_ACCEPTOR,
-    DEFAULT_MAX_LENGTH,
-    STATUS_WARNING,
-    STATUS_SUCCESS,
-    STATUS_CANCEL,
-    STATUS_PENDING,
-    STATUS_FAILURE,
-)
-from pynetdicom._handlers import (
-    standard_dimse_recv_handler,
-    standard_dimse_sent_handler,
-    standard_pdu_recv_handler,
-    standard_pdu_sent_handler,
-)
 from pynetdicom.pdu_primitives import (
-    UserIdentityNegotiation,
-    MaximumLengthNotification,
+    _UI,
+    A_ASSOCIATE,
+    AsynchronousOperationsWindowNegotiation,
     ImplementationClassUIDNotification,
     ImplementationVersionNameNotification,
-    AsynchronousOperationsWindowNegotiation,
-    SOPClassExtendedNegotiation,
-    SOPClassCommonExtendedNegotiation,
+    MaximumLengthNotification,
     SCP_SCU_RoleSelectionNegotiation,
-    A_ASSOCIATE,
-    _UI,
+    SOPClassCommonExtendedNegotiation,
+    SOPClassExtendedNegotiation,
+    UserIdentityNegotiation,
     _UITypes,
 )
 from pynetdicom.presentation import PresentationContext
 from pynetdicom.sop_class import (  # type: ignore
     RepositoryQuery,
-    uid_to_service_class,
+    UnifiedProcedureStepEvent,
     UnifiedProcedureStepPull,
     UnifiedProcedureStepPush,
-    UnifiedProcedureStepEvent,
     UnifiedProcedureStepQuery,
     UnifiedProcedureStepWatch,
     Verification,
+    uid_to_service_class,
 )
-from pynetdicom.status import code_to_category, STORAGE_SERVICE_CLASS_STATUS
+from pynetdicom.status import STORAGE_SERVICE_CLASS_STATUS, code_to_category
 from pynetdicom.transport import AddressInformation
-from pynetdicom.utils import make_target, set_timer_resolution, set_ae, decode_bytes
+from pynetdicom.utils import decode_bytes, make_target, set_ae, set_timer_resolution
 
 if TYPE_CHECKING:  # pragma: no cover
     from pynetdicom.ae import ApplicationEntity
diff --git a/pynetdicom/dimse.py b/pynetdicom/dimse.py
index c8d9f7c1c..6ae1533a8 100644
--- a/pynetdicom/dimse.py
+++ b/pynetdicom/dimse.py
@@ -2,54 +2,52 @@
 Implementation of the DIMSE service provider.
 """
 
-from io import BytesIO
 import logging
 import queue
 import threading
+from io import BytesIO
 from typing import TYPE_CHECKING, cast
 
 from pynetdicom import evt
-
 from pynetdicom.dimse_messages import (
-    C_STORE_RQ,
-    C_STORE_RSP,
+    C_CANCEL_RQ,
+    C_ECHO_RQ,
+    C_ECHO_RSP,
     C_FIND_RQ,
     C_FIND_RSP,
     C_GET_RQ,
     C_GET_RSP,
     C_MOVE_RQ,
     C_MOVE_RSP,
-    C_ECHO_RQ,
-    C_ECHO_RSP,
-    C_CANCEL_RQ,
-    N_EVENT_REPORT_RQ,
-    N_GET_RQ,
-    N_SET_RQ,
+    C_STORE_RQ,
+    C_STORE_RSP,
     N_ACTION_RQ,
+    N_ACTION_RSP,
     N_CREATE_RQ,
+    N_CREATE_RSP,
     N_DELETE_RQ,
+    N_DELETE_RSP,
+    N_EVENT_REPORT_RQ,
     N_EVENT_REPORT_RSP,
+    N_GET_RQ,
     N_GET_RSP,
+    N_SET_RQ,
     N_SET_RSP,
-    N_ACTION_RSP,
-    N_CREATE_RSP,
-    N_DELETE_RSP,
     DIMSEMessage,
 )
-
 from pynetdicom.dimse_primitives import (
-    C_STORE,
+    C_CANCEL,
+    C_ECHO,
     C_FIND,
     C_GET,
     C_MOVE,
-    C_ECHO,
-    C_CANCEL,
-    N_EVENT_REPORT,
-    N_GET,
-    N_SET,
+    C_STORE,
     N_ACTION,
     N_CREATE,
     N_DELETE,
+    N_EVENT_REPORT,
+    N_GET,
+    N_SET,
     DimsePrimitiveType,
     DimseServiceType,
 )
diff --git a/pynetdicom/dimse_messages.py b/pynetdicom/dimse_messages.py
index 5d5b161ba..c5544be74 100644
--- a/pynetdicom/dimse_messages.py
+++ b/pynetdicom/dimse_messages.py
@@ -1,12 +1,12 @@
 """Define the DIMSE Message classes."""
 
-from io import BytesIO
 import logging
+from collections.abc import Iterator
+from io import BytesIO
 from math import ceil
 from pathlib import Path
 from tempfile import NamedTemporaryFile
 from typing import TYPE_CHECKING, cast
-from collections.abc import Iterator
 
 from pydicom.dataset import Dataset
 from pydicom.filewriter import write_file_meta_info
@@ -15,21 +15,21 @@
 
 from pynetdicom import _config
 from pynetdicom.dimse_primitives import (
-    C_STORE,
+    C_CANCEL,
+    C_ECHO,
     C_FIND,
     C_GET,
     C_MOVE,
-    C_ECHO,
-    C_CANCEL,
-    N_EVENT_REPORT,
-    N_GET,
-    N_SET,
+    C_STORE,
     N_ACTION,
     N_CREATE,
     N_DELETE,
+    N_EVENT_REPORT,
+    N_GET,
+    N_SET,
     DimsePrimitiveType,
 )
-from pynetdicom.dsutils import encode, decode, create_file_meta
+from pynetdicom.dsutils import create_file_meta, decode, encode
 from pynetdicom.pdu_primitives import P_DATA
 
 if TYPE_CHECKING:  # pragma: no cover
diff --git a/pynetdicom/dimse_primitives.py b/pynetdicom/dimse_primitives.py
index 77ed79cc0..e89021ed7 100644
--- a/pynetdicom/dimse_primitives.py
+++ b/pynetdicom/dimse_primitives.py
@@ -6,18 +6,18 @@
     in order for the DIMSE messages/primitives to be created correctly.
 """
 
+import logging
+import warnings
 from collections.abc import Sequence
 from io import BytesIO
-import logging
 from pathlib import Path
 from typing import TYPE_CHECKING, TypeAlias
-import warnings
 
-from pydicom.tag import Tag, BaseTag
+from pydicom.tag import BaseTag, Tag
 from pydicom.uid import UID
 
 from pynetdicom._globals import OptionalUIDType
-from pynetdicom.utils import set_ae, decode_bytes, set_uid
+from pynetdicom.utils import decode_bytes, set_ae, set_uid
 
 if TYPE_CHECKING:  # pragma: no cover
     from io import BufferedWriter
diff --git a/pynetdicom/dsutils.py b/pynetdicom/dsutils.py
index 965fa421c..fa2d72a05 100644
--- a/pynetdicom/dsutils.py
+++ b/pynetdicom/dsutils.py
@@ -1,13 +1,13 @@
 """DICOM dataset utility functions."""
 
-from io import BytesIO
 import logging
-from pathlib import Path
 import zlib
+from io import BytesIO
+from pathlib import Path
 
 from pydicom import Dataset
-from pydicom.dataset import FileMetaDataset
 from pydicom.dataelem import DataElement
+from pydicom.dataset import FileMetaDataset
 from pydicom.filebase import DicomBytesIO
 from pydicom.filereader import read_dataset, read_preamble
 from pydicom.filewriter import write_dataset, write_file_meta_info
diff --git a/pynetdicom/dul.py b/pynetdicom/dul.py
index a5f03b0db..b7699ea2f 100644
--- a/pynetdicom/dul.py
+++ b/pynetdicom/dul.py
@@ -5,27 +5,27 @@
 import logging
 import queue
 import struct
-from threading import Thread
 import time
+from threading import Thread
 from typing import TYPE_CHECKING, cast
 
 from pynetdicom import evt
 from pynetdicom.fsm import StateMachine
 from pynetdicom.pdu import (
-    A_ASSOCIATE_RQ,
+    A_ABORT_RQ,
     A_ASSOCIATE_AC,
     A_ASSOCIATE_RJ,
-    P_DATA_TF,
-    A_RELEASE_RQ,
+    A_ASSOCIATE_RQ,
     A_RELEASE_RP,
-    A_ABORT_RQ,
+    A_RELEASE_RQ,
+    P_DATA_TF,
     _PDUType,
 )
 from pynetdicom.pdu_primitives import (
-    A_ASSOCIATE,
-    A_RELEASE,
     A_ABORT,
+    A_ASSOCIATE,
     A_P_ABORT,
+    A_RELEASE,
     P_DATA,
     _PDUPrimitiveType,
 )
diff --git a/pynetdicom/events.py b/pynetdicom/events.py
index e8d8c83ee..a7d54e5d9 100644
--- a/pynetdicom/events.py
+++ b/pynetdicom/events.py
@@ -2,22 +2,22 @@
 the state machine events.
 """
 
-from datetime import datetime
-from io import BytesIO
 import inspect
 import logging
-from pathlib import Path
 import sys
-from typing import Any, NamedTuple, TYPE_CHECKING, cast, TypeAlias
 from collections.abc import Callable, Iterator
+from datetime import datetime
+from io import BytesIO
+from pathlib import Path
+from typing import TYPE_CHECKING, Any, NamedTuple, TypeAlias, cast
 
 from pydicom.dataset import Dataset, FileMetaDataset
-from pynetdicom.dimse_primitives import C_STORE
 from pydicom.filereader import dcmread
 from pydicom.tag import BaseTag
 from pydicom.uid import UID
 
-from pynetdicom.dsutils import decode, create_file_meta, encode_file_meta
+from pynetdicom.dimse_primitives import C_STORE
+from pynetdicom.dsutils import create_file_meta, decode, encode_file_meta
 
 if TYPE_CHECKING:  # pragma: no cover
     from pynetdicom.association import Association
diff --git a/pynetdicom/fsm.py b/pynetdicom/fsm.py
index 5a182a9fa..695d9ae11 100644
--- a/pynetdicom/fsm.py
+++ b/pynetdicom/fsm.py
@@ -8,21 +8,21 @@
 
 from pynetdicom import evt
 from pynetdicom.pdu import (
-    A_ASSOCIATE_RQ,
-    A_ASSOCIATE_RJ,
+    A_ABORT_RQ,
     A_ASSOCIATE_AC,
-    P_DATA_TF,
-    A_RELEASE_RQ,
+    A_ASSOCIATE_RJ,
+    A_ASSOCIATE_RQ,
     A_RELEASE_RP,
-    A_ABORT_RQ,
+    A_RELEASE_RQ,
+    P_DATA_TF,
 )
-from pynetdicom.pdu_primitives import A_P_ABORT, A_ABORT
-from pynetdicom.transport import T_CONNECT, AssociationSocket, AddressInformation
+from pynetdicom.pdu_primitives import A_ABORT, A_P_ABORT
+from pynetdicom.transport import T_CONNECT, AddressInformation, AssociationSocket
 
 if TYPE_CHECKING:  # pragma: no cover
     from pynetdicom.dul import DULServiceProvider
+    from pynetdicom.pdu_primitives import A_ASSOCIATE, A_RELEASE, P_DATA
     from pynetdicom.transport import AssociationSocket
-    from pynetdicom.pdu_primitives import A_ASSOCIATE, P_DATA, A_RELEASE
 
 
 LOGGER = logging.getLogger(__name__)
diff --git a/pynetdicom/pdu.py b/pynetdicom/pdu.py
index cf66c6ab2..ac4ee0adc 100644
--- a/pynetdicom/pdu.py
+++ b/pynetdicom/pdu.py
@@ -20,31 +20,31 @@
 """
 
 import logging
+from collections.abc import Callable, Iterator
 from struct import Struct
-from typing import Any, TYPE_CHECKING, cast, TypeAlias
-from collections.abc import Iterator, Callable
+from typing import TYPE_CHECKING, Any, TypeAlias, cast
 
 from pydicom.uid import UID
 
 from pynetdicom.pdu_items import (
+    PDU_ITEM_TYPES,
     ApplicationContextItem,
-    PresentationContextItemRQ,
+    PDUItem,
     PresentationContextItemAC,
-    UserInformationItem,
+    PresentationContextItemRQ,
     PresentationDataValueItem,
-    PDU_ITEM_TYPES,
+    UserInformationItem,
     _PDUItemType,
-    PDUItem,
 )
 from pynetdicom.utils import decode_bytes, set_ae
 
 if TYPE_CHECKING:  # pragma: no cover
     from pynetdicom.pdu_primitives import (
-        A_ASSOCIATE,
-        P_DATA,
-        A_RELEASE,
         A_ABORT,
+        A_ASSOCIATE,
         A_P_ABORT,
+        A_RELEASE,
+        P_DATA,
     )
 
 
diff --git a/pynetdicom/pdu_items.py b/pynetdicom/pdu_items.py
index d23ddece6..cfefd8bbb 100644
--- a/pynetdicom/pdu_items.py
+++ b/pynetdicom/pdu_items.py
@@ -41,26 +41,26 @@
 """
 
 import logging
+from collections.abc import Callable, Iterator
 from struct import Struct
-from typing import Any, TYPE_CHECKING, cast, TypeAlias
-from collections.abc import Iterator, Callable
+from typing import TYPE_CHECKING, Any, TypeAlias, cast
 
 from pydicom.uid import UID
 
 from pynetdicom._globals import OptionalUIDType
 from pynetdicom.presentation import PresentationContext
-from pynetdicom.utils import validate_uid, decode_bytes, set_ae, set_uid
+from pynetdicom.utils import decode_bytes, set_ae, set_uid, validate_uid
 
 if TYPE_CHECKING:  # pragma: no cover
     from pynetdicom.pdu_primitives import (
-        MaximumLengthNotification,
-        ImplementationVersionNameNotification,
+        AsynchronousOperationsWindowNegotiation,
         ImplementationClassUIDNotification,
-        SOPClassExtendedNegotiation,
-        SOPClassCommonExtendedNegotiation,
+        ImplementationVersionNameNotification,
+        MaximumLengthNotification,
         SCP_SCU_RoleSelectionNegotiation,
+        SOPClassCommonExtendedNegotiation,
+        SOPClassExtendedNegotiation,
         UserIdentityNegotiation,
-        AsynchronousOperationsWindowNegotiation,
         _UserInformationPrimitiveType,
     )
 
diff --git a/pynetdicom/pdu_primitives.py b/pynetdicom/pdu_primitives.py
index 8fa642b42..fac847dec 100644
--- a/pynetdicom/pdu_primitives.py
+++ b/pynetdicom/pdu_primitives.py
@@ -3,25 +3,24 @@
 """
 
 import logging
-from typing import cast, TypeAlias, TYPE_CHECKING
+from typing import TYPE_CHECKING, TypeAlias, cast
 
 from pydicom.uid import UID
 
-from pynetdicom._globals import OptionalUIDType
+from pynetdicom._globals import DEFAULT_MAX_LENGTH, OptionalUIDType
 from pynetdicom.pdu_items import (
-    MaximumLengthSubItem,
+    AsynchronousOperationsWindowSubItem,
     ImplementationClassUIDSubItem,
     ImplementationVersionNameSubItem,
-    AsynchronousOperationsWindowSubItem,
+    MaximumLengthSubItem,
     SCP_SCU_RoleSelectionSubItem,
-    SOPClassExtendedNegotiationSubItem,
     SOPClassCommonExtendedNegotiationSubItem,
-    UserIdentitySubItemRQ,
+    SOPClassExtendedNegotiationSubItem,
     UserIdentitySubItemAC,
+    UserIdentitySubItemRQ,
 )
 from pynetdicom.presentation import PresentationContext
-from pynetdicom.utils import validate_uid, decode_bytes, set_ae, set_uid
-from pynetdicom._globals import DEFAULT_MAX_LENGTH
+from pynetdicom.utils import decode_bytes, set_ae, set_uid, validate_uid
 
 if TYPE_CHECKING:  # pragma: no cover
     from pynetdicom.transport import AddressInformation
diff --git a/pynetdicom/presentation.py b/pynetdicom/presentation.py
index 2bb889af7..16ad663a3 100644
--- a/pynetdicom/presentation.py
+++ b/pynetdicom/presentation.py
@@ -5,8 +5,8 @@
 
 from pydicom.uid import UID
 
-from pynetdicom._globals import DEFAULT_TRANSFER_SYNTAXES
 from pynetdicom import sop_class as SOP_CLASS_MODULE
+from pynetdicom._globals import DEFAULT_TRANSFER_SYNTAXES
 from pynetdicom.sop_class import (
     _APPLICATION_EVENT_CLASSES,
     _BASIC_WORKLIST_CLASSES,
@@ -31,7 +31,7 @@
     _UNIFIED_PROCEDURE_STEP_CLASSES,
     _VERIFICATION_CLASSES,
 )
-from pynetdicom.utils import validate_uid, set_uid
+from pynetdicom.utils import set_uid, validate_uid
 
 if TYPE_CHECKING:  # pragma: no cover
     from pynetdicom.pdu_primitives import SCP_SCU_RoleSelectionNegotiation
diff --git a/pynetdicom/service_class.py b/pynetdicom/service_class.py
index 1df54a067..5e6d1258c 100644
--- a/pynetdicom/service_class.py
+++ b/pynetdicom/service_class.py
@@ -1,57 +1,57 @@
 """Implements the supported Service Classes."""
 
-from io import BytesIO
 import logging
 import os
 import sys
 import traceback
+from collections.abc import Iterator, Sequence
+from io import BytesIO
 from types import TracebackType
 from typing import (
     TYPE_CHECKING,
-    cast,
     Any,
     TypeVar,
+    cast,
 )
-from collections.abc import Iterator, Sequence
 
 from pydicom.dataset import Dataset
 from pydicom.tag import Tag
 
-from pynetdicom import evt, _config
-from pynetdicom.dsutils import decode, encode, pretty_dataset
+from pynetdicom import _config, evt
+from pynetdicom._globals import (
+    STATUS_CANCEL,
+    STATUS_FAILURE,
+    STATUS_PENDING,
+    STATUS_SUCCESS,
+    STATUS_WARNING,
+)
 from pynetdicom.dimse_primitives import (
-    C_STORE,
     C_ECHO,
-    C_MOVE,
-    C_GET,
     C_FIND,
+    C_GET,
+    C_MOVE,
+    C_STORE,
     N_ACTION,
     N_CREATE,
     N_DELETE,
     N_EVENT_REPORT,
     N_GET,
     N_SET,
-    DimseServiceType,
     DIMSEPrimitive,
+    DimseServiceType,
 )
-from pynetdicom._globals import (
-    STATUS_FAILURE,
-    STATUS_SUCCESS,
-    STATUS_WARNING,
-    STATUS_PENDING,
-    STATUS_CANCEL,
-)
+from pynetdicom.dsutils import decode, encode, pretty_dataset
 from pynetdicom.status import (
-    StatusDictType,
     GENERAL_STATUS,
+    NON_PATIENT_SERVICE_CLASS_STATUS,
     QR_FIND_SERVICE_CLASS_STATUS,
     QR_GET_SERVICE_CLASS_STATUS,
     QR_MOVE_SERVICE_CLASS_STATUS,
-    NON_PATIENT_SERVICE_CLASS_STATUS,
     RELEVANT_PATIENT_SERVICE_CLASS_STATUS,
-    SUBSTANCE_ADMINISTRATION_SERVICE_CLASS_STATUS,
     STORAGE_SERVICE_CLASS_STATUS,
+    SUBSTANCE_ADMINISTRATION_SERVICE_CLASS_STATUS,
     VERIFICATION_SERVICE_CLASS_STATUS,
+    StatusDictType,
 )
 
 if TYPE_CHECKING:  # pragma: no cover
diff --git a/pynetdicom/service_class_n.py b/pynetdicom/service_class_n.py
index fccb11453..d996b1770 100644
--- a/pynetdicom/service_class_n.py
+++ b/pynetdicom/service_class_n.py
@@ -4,24 +4,24 @@
 from typing import TYPE_CHECKING
 
 from pynetdicom.dimse_primitives import (
+    C_FIND,
     N_ACTION,
     N_CREATE,
     N_DELETE,
     N_EVENT_REPORT,
     N_GET,
     N_SET,
-    C_FIND,
 )
 from pynetdicom.service_class import ServiceClass
 from pynetdicom.status import (
-    GENERAL_STATUS,
     APPLICATION_EVENT_LOGGING_SERVICE_CLASS_STATUS,
+    GENERAL_STATUS,
     MEDIA_CREATION_MANAGEMENT_SERVICE_CLASS_STATUS,
     PRINT_JOB_MANAGEMENT_SERVICE_CLASS_STATUS,
     PROCEDURE_STEP_STATUS,
+    RT_MACHINE_VERIFICATION_SERVICE_CLASS_STATUS,
     STORAGE_COMMITMENT_SERVICE_CLASS_STATUS,
     STORAGE_MANAGEMENT_SERVICE_CLASS_STATUS,
-    RT_MACHINE_VERIFICATION_SERVICE_CLASS_STATUS,
     UNIFIED_PROCEDURE_STEP_SERVICE_CLASS_STATUS,
 )
 
diff --git a/pynetdicom/sop_class.py b/pynetdicom/sop_class.py
index e4a50c526..65eac78ce 100644
--- a/pynetdicom/sop_class.py
+++ b/pynetdicom/sop_class.py
@@ -1,9 +1,9 @@
 """Generates the supported SOP Classes and well-known SOP Instances."""
 
 import inspect
-from keyword import iskeyword
 import logging
 import sys
+from keyword import iskeyword
 from typing import cast
 
 from pydicom.uid import UID
diff --git a/pynetdicom/status.py b/pynetdicom/status.py
index b0831ec3f..a99fad440 100644
--- a/pynetdicom/status.py
+++ b/pynetdicom/status.py
@@ -5,12 +5,12 @@
 from pydicom.dataset import Dataset
 
 from pynetdicom._globals import (
-    STATUS_SUCCESS,
-    STATUS_FAILURE,
-    STATUS_WARNING,
     STATUS_CANCEL,
+    STATUS_FAILURE,
     STATUS_PENDING,
+    STATUS_SUCCESS,
     STATUS_UNKNOWN,
+    STATUS_WARNING,
 )
 
 __all__ = [
diff --git a/pynetdicom/transport.py b/pynetdicom/transport.py
index b17a23e44..35377f73e 100644
--- a/pynetdicom/transport.py
+++ b/pynetdicom/transport.py
@@ -1,13 +1,13 @@
 """Implementation of the Transport Service."""
 
-from copy import deepcopy
-from datetime import datetime
 import gc
 import logging
 import queue
 import select
 import socket
-from socketserver import TCPServer, ThreadingMixIn, BaseRequestHandler
+from copy import deepcopy
+from datetime import datetime
+from socketserver import BaseRequestHandler, TCPServer, ThreadingMixIn
 
 try:
     import ssl
@@ -18,11 +18,11 @@
     #   and must use "ssl.SSLContext" in type hints
     _HAS_SSL = False
 import threading
-from typing import TYPE_CHECKING, Any, cast
-from collections.abc import Callable
 import warnings
+from collections.abc import Callable
+from typing import TYPE_CHECKING, Any, cast
 
-from pynetdicom import evt, _config
+from pynetdicom import _config, evt
 from pynetdicom._globals import MODE_ACCEPTOR
 from pynetdicom._handlers import (
     standard_dimse_recv_handler,
diff --git a/pynetdicom/utils.py b/pynetdicom/utils.py
index 1d4beaa4b..2cfd9f99a 100644
--- a/pynetdicom/utils.py
+++ b/pynetdicom/utils.py
@@ -1,12 +1,12 @@
 """Various utility functions."""
 
+import logging
+import sys
+from collections.abc import Callable, Iterator, Sequence
 from contextlib import contextmanager
 from contextvars import copy_context
 from io import BytesIO
-import logging
-import sys
 from typing import cast
-from collections.abc import Iterator, Callable, Sequence
 
 try:
     import ctypes