diff --git a/eccodes/highlevel/_bufr/__init__.py b/eccodes/highlevel/_bufr/__init__.py
index 32f4bda..385d512 100644
--- a/eccodes/highlevel/_bufr/__init__.py
+++ b/eccodes/highlevel/_bufr/__init__.py
@@ -5,3 +5,11 @@
 from .common import change_behaviour, get_behaviour, set_behaviour
 from .helpers import missing_of
 from .message import BUFRMessage
+
+__all__ = [
+    "change_behaviour",
+    "get_behaviour",
+    "set_behaviour",
+    "missing_of",
+    "BUFRMessage",
+]
diff --git a/eccodes/highlevel/_bufr/coder.py b/eccodes/highlevel/_bufr/coder.py
index e96a1ce..b08196d 100644
--- a/eccodes/highlevel/_bufr/coder.py
+++ b/eccodes/highlevel/_bufr/coder.py
@@ -8,10 +8,14 @@
 
 import io
 import warnings
+from functools import cached_property
+
+# flake8: noqa: F405
+#   ruff: noqa: F403
 
 from .common import *
 from .helpers import ensure_array, missing_of
-from .tables import Code, Element, Tables, Version
+from .tables import Tables, Version
 
 TEMPLATE_KEYS = dict.fromkeys(
     [
@@ -706,7 +710,7 @@ def keys_of(
         for key in keys:
             if key == "unexpandedDescriptors":
                 next_key = next(keys, None)
-                if next_key == None:
+                if next_key is None:
                     if not header_only:
                         raise RuntimeError(data_keys_unaccessible)
                 else:
diff --git a/eccodes/highlevel/_bufr/common.py b/eccodes/highlevel/_bufr/common.py
index c336792..b3eb962 100644
--- a/eccodes/highlevel/_bufr/common.py
+++ b/eccodes/highlevel/_bufr/common.py
@@ -8,15 +8,12 @@
 
 import datetime as dt
 import enum
-import re
-import sys
-from collections import Counter, abc, defaultdict
+from collections import Counter, abc, defaultdict  # noqa
+from contextlib import contextmanager
 from copy import deepcopy
-from dataclasses import dataclass, field, fields
+from dataclasses import dataclass, field, fields  # noqa
 from enum import auto
-from functools import cached_property
-from pathlib import Path
-from typing import (
+from typing import (  # noqa
     Any,
     BinaryIO,
     Callable,
@@ -33,12 +30,11 @@
 
 import numpy
 import numpy as np
-from numpy.ma import MaskedArray
-from numpy.typing import DTypeLike, NDArray
+from numpy.ma import MaskedArray  # noqa
+from numpy.typing import DTypeLike, NDArray  # noqa
 
-import eccodes
 from eccodes.eccodes import KeyValueNotFoundError as NotFoundError
-from eccodes.eccodes import *
+from eccodes.eccodes import *  # noqa
 
 from .tables import Element
 
@@ -88,22 +84,19 @@ class Behaviour:
 
 
 def get_behaviour():
-    global current_behaviour
+    global current_behaviour  # noqa
     return deepcopy(current_behaviour)
 
 
 def set_behaviour(new_behaviour):
-    global current_behaviour
+    global current_behaviour  # noqa
     for f in fields(new_behaviour):
         setattr(current_behaviour, f.name, getattr(new_behaviour, f.name))
 
 
-from contextlib import contextmanager
-
-
 @contextmanager
 def change_behaviour():
-    global current_behaviour
+    global current_behaviour  # noqa
     saved_behaviour = get_behaviour()
     try:
         yield current_behaviour
diff --git a/eccodes/highlevel/_bufr/data.py b/eccodes/highlevel/_bufr/data.py
index bedbcf2..6101581 100644
--- a/eccodes/highlevel/_bufr/data.py
+++ b/eccodes/highlevel/_bufr/data.py
@@ -6,10 +6,14 @@
 # granted to it by virtue of its status as an intergovernmental organisation
 # nor does it submit to any jurisdiction.
 
+from functools import cached_property
+
+# flake8: noqa: F405
+#   ruff: noqa: F403
+
 from .coder import Coder
 from .common import *
 from .helpers import ensure_masked_array, flatten, missing_of
-from .tables import Element
 from .tree import (
     AssociationNode,
     LeafNode,
@@ -480,7 +484,7 @@ def _get_slice(self, entry, key):
             rank_count = slice_.stop - slice_.start
             if key.rank > rank_count:
                 message = (
-                    f"Rank %d is out of bounds; max. rank of '%s' in this view is %d"
+                    "Rank %d is out of bounds; max. rank of '%s' in this view is %d"
                 )
                 raise NotFoundError(message % (key.rank, entry.name, rank_count))
             start = slice_.start + key.rank - 1
diff --git a/eccodes/highlevel/_bufr/header.py b/eccodes/highlevel/_bufr/header.py
index 7cc8de9..090ff6e 100644
--- a/eccodes/highlevel/_bufr/header.py
+++ b/eccodes/highlevel/_bufr/header.py
@@ -6,6 +6,9 @@
 # granted to it by virtue of its status as an intergovernmental organisation
 # nor does it submit to any jurisdiction.
 
+# flake8: noqa: F405
+#   ruff: noqa: F403
+
 from .coder import INPUT_TEMPLATE_KEYS, TEMPLATE_KEYS, Coder
 from .common import *
 from .helpers import get_date, get_datetime, get_time, set_date, set_datetime, set_time
diff --git a/eccodes/highlevel/_bufr/helpers.py b/eccodes/highlevel/_bufr/helpers.py
index 5d597c1..c944cf2 100644
--- a/eccodes/highlevel/_bufr/helpers.py
+++ b/eccodes/highlevel/_bufr/helpers.py
@@ -6,6 +6,9 @@
 # granted to it by virtue of its status as an intergovernmental organisation
 # nor does it submit to any jurisdiction.
 
+# flake8: noqa: F405
+#   ruff: noqa: F403
+
 from .common import *
 
 
diff --git a/eccodes/highlevel/_bufr/message.py b/eccodes/highlevel/_bufr/message.py
index b428803..12f68b9 100644
--- a/eccodes/highlevel/_bufr/message.py
+++ b/eccodes/highlevel/_bufr/message.py
@@ -8,6 +8,9 @@
 
 import datetime as dt
 
+# flake8: noqa: F405
+#   ruff: noqa: F403
+
 from .coder import Coder
 from .common import *
 from .data import Data
diff --git a/eccodes/highlevel/_bufr/tables.py b/eccodes/highlevel/_bufr/tables.py
index 348f253..a2ab847 100644
--- a/eccodes/highlevel/_bufr/tables.py
+++ b/eccodes/highlevel/_bufr/tables.py
@@ -7,11 +7,13 @@
 # nor does it submit to any jurisdiction.
 
 import csv
+import ctypes
+import os
 import re
 from collections import ChainMap, UserDict
-from dataclasses import dataclass, field
+from dataclasses import dataclass
 from pathlib import Path
-from typing import Iterator, List, Optional, Tuple, Union
+from typing import Iterator, List, Tuple, Union
 
 import eccodes
 import gribapi
@@ -208,10 +210,9 @@ def expand_descriptors(
             yield Descriptor(code, name)
 
 
-import ctypes
-import os
-
-libc = ctypes.CDLL(None, winmode=0)  # automatically finds and loads the C standard library
+libc = ctypes.CDLL(
+    None, winmode=0
+)  # automatically finds and loads the C standard library
 
 fseek = libc.fseek
 fseek.argtypes = [ctypes.c_void_p, ctypes.c_long, ctypes.c_int]
diff --git a/eccodes/highlevel/_bufr/tree.py b/eccodes/highlevel/_bufr/tree.py
index 80edd6a..9d6c291 100644
--- a/eccodes/highlevel/_bufr/tree.py
+++ b/eccodes/highlevel/_bufr/tree.py
@@ -6,9 +6,13 @@
 # granted to it by virtue of its status as an intergovernmental organisation
 # nor does it submit to any jurisdiction.
 
+import re
 from copy import copy
 from itertools import repeat
 
+# flake8: noqa: F405
+#   ruff: noqa: F403
+
 from .common import *
 from .helpers import RaggedArray, SingletonDict
 from .tables import Code, Element
@@ -381,7 +385,7 @@ def recurse(node):
                 for key in node.keys:
                     try:
                         entry = entries[key.name]
-                    except:
+                    except KeyError:
                         entry = DataEntry(key.name, flags=key.flags)
                         if entry.name in current_behaviour.assumed_scalar_elements:
                             entry.flags |= SCALAR
diff --git a/eccodes/highlevel/_bufr/view.py b/eccodes/highlevel/_bufr/view.py
index 0bb9aef..018891c 100644
--- a/eccodes/highlevel/_bufr/view.py
+++ b/eccodes/highlevel/_bufr/view.py
@@ -6,7 +6,8 @@
 # granted to it by virtue of its status as an intergovernmental organisation
 # nor does it submit to any jurisdiction.
 
-import datetime as dt
+# flake8: noqa: F405
+#   ruff: noqa: F403
 
 from .common import *
 from .helpers import get_datetime, set_datetime
diff --git a/eccodes/highlevel/message.py b/eccodes/highlevel/message.py
index e20884c..8b5b7e5 100644
--- a/eccodes/highlevel/message.py
+++ b/eccodes/highlevel/message.py
@@ -5,7 +5,7 @@
 
 import eccodes
 
-from ._bufr import BUFRMessage
+from ._bufr import BUFRMessage  # noqa
 
 _TYPES_MAP = {
     "float": float,
diff --git a/tox.ini b/tox.ini
index 4e7403a..e8a1b75 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,6 +22,7 @@ deps =
 commands = python setup.py test
 
 [flake8]
+alias pip='pip --disable-pip-version-check'
 ; F401 = imported but unused
 ; F405 = may be undefined, or defined from star imports
 ; F403 = import * used; unable to detect undefined names