diff --git a/bench/compress_normal.py b/bench/compress_normal.py
index 803d54b76..608cfe8dc 100644
--- a/bench/compress_normal.py
+++ b/bench/compress_normal.py
@@ -1,9 +1,9 @@
 import sys
 import timeit
 
+import line_profiler
 import numpy as np
 
-import line_profiler
 import zarr
 from zarr import blosc
 
diff --git a/docs/release.rst b/docs/release.rst
index e2f9f3de8..d2e73f4ec 100644
--- a/docs/release.rst
+++ b/docs/release.rst
@@ -26,6 +26,9 @@ Unreleased
 Enhancements
 ~~~~~~~~~~~~
 
+* Enable ruff/isort rules (I) and fix issues.
+  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>` :issue:`1704`.
+
 Docs
 ~~~~
 
diff --git a/pyproject.toml b/pyproject.toml
index dacd45ec2..b77da145e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -105,7 +105,8 @@ exclude = [
 
 [tool.ruff.lint]
 extend-select = [
-    "B"
+    "B",
+    "I"
 ]
 
 [tool.black]
diff --git a/zarr/_storage/absstore.py b/zarr/_storage/absstore.py
index 1e49754f3..b23f5800b 100644
--- a/zarr/_storage/absstore.py
+++ b/zarr/_storage/absstore.py
@@ -1,19 +1,20 @@
 """This module contains storage classes related to Azure Blob Storage (ABS)"""
 
-from typing import Optional
 import warnings
+from typing import Optional
 
 from numcodecs.compat import ensure_bytes
-from zarr.util import normalize_storage_path
+
 from zarr._storage.store import (
+    V3_DEPRECATION_MESSAGE,
+    Store,
+    StoreV3,
     _get_metadata_suffix,
     data_root,
     meta_root,
-    Store,
-    StoreV3,
-    V3_DEPRECATION_MESSAGE,
 )
 from zarr.types import DIMENSION_SEPARATOR
+from zarr.util import normalize_storage_path
 
 __doctest_requires__ = {
     ("ABSStore", "ABSStore.*"): ["azure.storage.blob"],
diff --git a/zarr/_storage/store.py b/zarr/_storage/store.py
index dba29d13c..c182927e4 100644
--- a/zarr/_storage/store.py
+++ b/zarr/_storage/store.py
@@ -7,10 +7,10 @@
 from string import ascii_letters, digits
 from typing import Any, Dict, List, Mapping, Optional, Sequence, Tuple, Union
 
-from zarr.meta import Metadata2, Metadata3
-from zarr.util import normalize_storage_path
 from zarr.context import Context
+from zarr.meta import Metadata2, Metadata3
 from zarr.types import ZARR_VERSION
+from zarr.util import normalize_storage_path
 
 # v2 store keys
 array_meta_key = ".zarray"
diff --git a/zarr/_storage/v3.py b/zarr/_storage/v3.py
index 4987f820c..7200a048d 100644
--- a/zarr/_storage/v3.py
+++ b/zarr/_storage/v3.py
@@ -3,39 +3,36 @@
 from collections import OrderedDict
 from collections.abc import MutableMapping
 from threading import Lock
-from typing import Union, Dict, Any, Optional
-
-from zarr.errors import (
-    MetadataError,
-    ReadOnlyError,
-)
-from zarr.util import buffer_size, json_loads, normalize_storage_path
-from zarr.types import DIMENSION_SEPARATOR
+from typing import Any, Dict, Optional, Union
 
 from zarr._storage.absstore import ABSStoreV3  # noqa: F401
 from zarr._storage.store import (  # noqa: F401
+    BaseStore,
+    Store,
+    StoreV3,
     _get_hierarchy_metadata,
     _get_metadata_suffix,
     _listdir_from_keys,
+    _path_to_prefix,
+    _prefix_to_array_key,
+    _prefix_to_group_key,
     _rename_from_keys,
     _rename_metadata_v3,
     _rmdir_from_keys,
     _rmdir_from_keys_v3,
-    _path_to_prefix,
-    _prefix_to_array_key,
-    _prefix_to_group_key,
     array_meta_key,
     attrs_key,
     data_root,
     group_meta_key,
     meta_root,
-    BaseStore,
-    Store,
-    StoreV3,
+)
+from zarr.errors import (
+    MetadataError,
+    ReadOnlyError,
 )
 from zarr.storage import (
-    DBMStore,
     ConsolidatedMetadataStore,
+    DBMStore,
     DirectoryStore,
     FSStore,
     KVStore,
@@ -48,6 +45,8 @@
     ZipStore,
     _getsize,
 )
+from zarr.types import DIMENSION_SEPARATOR
+from zarr.util import buffer_size, json_loads, normalize_storage_path
 
 __doctest_requires__ = {
     ("RedisStore", "RedisStore.*"): ["redis"],
diff --git a/zarr/_storage/v3_storage_transformers.py b/zarr/_storage/v3_storage_transformers.py
index 00467d44f..132616571 100644
--- a/zarr/_storage/v3_storage_transformers.py
+++ b/zarr/_storage/v3_storage_transformers.py
@@ -1,15 +1,14 @@
 import functools
 import itertools
 import os
-from typing import NamedTuple, Tuple, Optional, Union, Iterator
+from typing import Iterator, NamedTuple, Optional, Tuple, Union
 
-from numcodecs.compat import ensure_bytes
 import numpy as np
+from numcodecs.compat import ensure_bytes
 
 from zarr._storage.store import StorageTransformer, StoreV3, _rmdir_from_keys_v3
-from zarr.util import normalize_storage_path
 from zarr.types import DIMENSION_SEPARATOR
-
+from zarr.util import normalize_storage_path
 
 MAX_UINT_64 = 2**64 - 1
 
diff --git a/zarr/convenience.py b/zarr/convenience.py
index bd284e084..f90b91d8d 100644
--- a/zarr/convenience.py
+++ b/zarr/convenience.py
@@ -4,29 +4,27 @@
 import os
 import re
 from collections.abc import Mapping, MutableMapping
+from typing import Union
 
-from zarr._storage.store import data_root, meta_root, assert_zarr_v3_api_available
+from zarr._storage.store import assert_zarr_v3_api_available, data_root, meta_root
+from zarr._storage.v3 import ConsolidatedMetadataStoreV3
 from zarr.core import Array
 from zarr.creation import array as _create_array
 from zarr.creation import open_array
 from zarr.errors import CopyError, PathNotFoundError
-from zarr.hierarchy import Group
+from zarr.hierarchy import Group, open_group
 from zarr.hierarchy import group as _create_group
-from zarr.hierarchy import open_group
 from zarr.meta import json_dumps, json_loads
 from zarr.storage import (
+    BaseStore,
+    ConsolidatedMetadataStore,
     _get_metadata_suffix,
     contains_array,
     contains_group,
     normalize_store_arg,
-    BaseStore,
-    ConsolidatedMetadataStore,
 )
-from zarr._storage.v3 import ConsolidatedMetadataStoreV3
 from zarr.util import TreeViewer, buffer_size, normalize_storage_path
 
-from typing import Union
-
 StoreLike = Union[BaseStore, MutableMapping, str, None]
 
 _builtin_open = open  # builtin open is later shadowed by a local open function
diff --git a/zarr/core.py b/zarr/core.py
index 6aa86b646..2f63d7932 100644
--- a/zarr/core.py
+++ b/zarr/core.py
@@ -14,17 +14,17 @@
 from zarr.attrs import Attributes
 from zarr.codecs import AsType, get_codec
 from zarr.context import Context
-from zarr.errors import ArrayNotFoundError, ReadOnlyError, ArrayIndexError
+from zarr.errors import ArrayIndexError, ArrayNotFoundError, ReadOnlyError
 from zarr.indexing import (
     BasicIndexer,
+    BlockIndex,
+    BlockIndexer,
     CoordinateIndexer,
     MaskIndexer,
     OIndex,
     OrthogonalIndexer,
-    VIndex,
-    BlockIndex,
-    BlockIndexer,
     PartialChunkIterator,
+    VIndex,
     check_fields,
     check_no_multi_fields,
     ensure_tuple,
@@ -36,18 +36,21 @@
     pop_fields,
 )
 from zarr.storage import (
+    KVStore,
     _get_hierarchy_metadata,
     _prefix_to_array_key,
-    KVStore,
     getsize,
     listdir,
     normalize_store_arg,
 )
 from zarr.util import (
     ConstantMap,
-    all_equal,
     InfoReporter,
+    PartialReadBuffer,
+    UncompressedPartialReadBufferV3,
+    all_equal,
     check_array_shape,
+    ensure_ndarray_like,
     human_readable_size,
     is_total_slice,
     nolock,
@@ -55,9 +58,6 @@
     normalize_resize_args,
     normalize_shape,
     normalize_storage_path,
-    PartialReadBuffer,
-    UncompressedPartialReadBufferV3,
-    ensure_ndarray_like,
 )
 
 __all__ = ["Array"]
diff --git a/zarr/creation.py b/zarr/creation.py
index 9b2b1d6d4..2a36c6395 100644
--- a/zarr/creation.py
+++ b/zarr/creation.py
@@ -1,5 +1,5 @@
 from collections.abc import MutableMapping
-from typing import Optional, Tuple, Union, Sequence
+from typing import Optional, Sequence, Tuple, Union
 from warnings import warn
 
 import numpy as np
@@ -7,7 +7,7 @@
 from numcodecs.abc import Codec
 from numcodecs.registry import codec_registry
 
-from zarr._storage.store import DEFAULT_ZARR_VERSION
+from zarr._storage.store import DEFAULT_ZARR_VERSION, StorageTransformer
 from zarr.core import Array
 from zarr.errors import (
     ArrayNotFoundError,
@@ -22,9 +22,8 @@
     normalize_storage_path,
     normalize_store_arg,
 )
-from zarr._storage.store import StorageTransformer
 from zarr.sync import Synchronizer
-from zarr.types import ZARR_VERSION, DIMENSION_SEPARATOR, MEMORY_ORDER, MetaArray, PathLike
+from zarr.types import DIMENSION_SEPARATOR, MEMORY_ORDER, ZARR_VERSION, MetaArray, PathLike
 from zarr.util import normalize_dimension_separator
 
 
diff --git a/zarr/hierarchy.py b/zarr/hierarchy.py
index 8894a5ed5..b8bae1025 100644
--- a/zarr/hierarchy.py
+++ b/zarr/hierarchy.py
@@ -4,12 +4,13 @@
 import numpy as np
 
 from zarr._storage.store import (
+    DEFAULT_ZARR_VERSION,
     _get_metadata_suffix,
+    assert_zarr_v3_api_available,
     data_root,
     meta_root,
-    DEFAULT_ZARR_VERSION,
-    assert_zarr_v3_api_available,
 )
+from zarr._storage.v3 import MemoryStoreV3
 from zarr.attrs import Attributes
 from zarr.core import Array
 from zarr.creation import (
@@ -25,17 +26,17 @@
     zeros_like,
 )
 from zarr.errors import (
+    ArrayNotFoundError,
     ContainsArrayError,
     ContainsGroupError,
-    ArrayNotFoundError,
     GroupNotFoundError,
     ReadOnlyError,
 )
 from zarr.storage import (
-    _get_hierarchy_metadata,
-    _prefix_to_group_key,
     BaseStore,
     MemoryStore,
+    _get_hierarchy_metadata,
+    _prefix_to_group_key,
     attrs_key,
     contains_array,
     contains_group,
@@ -46,7 +47,6 @@
     rename,
     rmdir,
 )
-from zarr._storage.v3 import MemoryStoreV3
 from zarr.util import (
     InfoReporter,
     TreeViewer,
diff --git a/zarr/indexing.py b/zarr/indexing.py
index 2f2402fe2..a9c3d1f11 100644
--- a/zarr/indexing.py
+++ b/zarr/indexing.py
@@ -5,13 +5,12 @@
 
 import numpy as np
 
-
 from zarr.errors import (
     ArrayIndexError,
+    BoundsCheckError,
     NegativeStepError,
-    err_too_many_indices,
     VindexInvalidSelectionError,
-    BoundsCheckError,
+    err_too_many_indices,
 )
 
 
diff --git a/zarr/meta.py b/zarr/meta.py
index 5430ab305..45305387e 100644
--- a/zarr/meta.py
+++ b/zarr/meta.py
@@ -1,6 +1,8 @@
 import base64
 import itertools
 from collections.abc import Mapping
+from typing import TYPE_CHECKING, Any, List, Optional, Union, cast
+from typing import Mapping as MappingType
 
 import numcodecs
 import numpy as np
@@ -9,8 +11,6 @@
 from zarr.errors import MetadataError
 from zarr.util import json_dumps, json_loads
 
-from typing import cast, Union, Any, List, Mapping as MappingType, Optional, TYPE_CHECKING
-
 if TYPE_CHECKING:  # pragma: no cover
     from zarr._storage.store import StorageTransformer
 
@@ -458,8 +458,8 @@ def _encode_storage_transformer_metadata(
 
     @classmethod
     def _decode_storage_transformer_metadata(cls, meta: Mapping) -> "StorageTransformer":
-        from zarr.tests.test_storage_v3 import DummyStorageTransfomer
         from zarr._storage.v3_storage_transformers import ShardingStorageTransformer
+        from zarr.tests.test_storage_v3 import DummyStorageTransfomer
 
         # This might be changed to a proper registry in the future
         KNOWN_STORAGE_TRANSFORMERS = [DummyStorageTransfomer, ShardingStorageTransformer]
diff --git a/zarr/n5.py b/zarr/n5.py
index 3d3e9afa2..c25f10b1a 100644
--- a/zarr/n5.py
+++ b/zarr/n5.py
@@ -4,8 +4,8 @@
 import os
 import struct
 import sys
-from typing import Any, Dict, Optional, cast
 import warnings
+from typing import Any, Dict, Optional, cast
 
 import numpy as np
 from numcodecs.abc import Codec
@@ -13,8 +13,7 @@
 from numcodecs.registry import get_codec, register_codec
 
 from .meta import ZARR_FORMAT, json_dumps, json_loads
-from .storage import FSStore
-from .storage import NestedDirectoryStore, _prog_ckey, _prog_number, normalize_storage_path
+from .storage import FSStore, NestedDirectoryStore, _prog_ckey, _prog_number, normalize_storage_path
 from .storage import array_meta_key as zarr_array_meta_key
 from .storage import attrs_key as zarr_attrs_key
 from .storage import group_meta_key as zarr_group_meta_key
diff --git a/zarr/storage.py b/zarr/storage.py
index f412870f7..803719dca 100644
--- a/zarr/storage.py
+++ b/zarr/storage.py
@@ -25,6 +25,8 @@
 import shutil
 import sys
 import tempfile
+import time
+import uuid
 import warnings
 import zipfile
 from collections import OrderedDict
@@ -33,28 +35,50 @@
 from os import scandir
 from pickle import PicklingError
 from threading import Lock, RLock
-from typing import Sequence, Mapping, Optional, Union, List, Tuple, Dict, Any
-import uuid
-import time
+from typing import Any, Dict, List, Mapping, Optional, Sequence, Tuple, Union
 
 from numcodecs.abc import Codec
-from numcodecs.compat import ensure_bytes, ensure_text, ensure_contiguous_ndarray_like
+from numcodecs.compat import ensure_bytes, ensure_contiguous_ndarray_like, ensure_text
 from numcodecs.registry import codec_registry
-from zarr.context import Context
-from zarr.types import PathLike as Path, DIMENSION_SEPARATOR
-from zarr.util import NoLock
 
+from zarr._storage.absstore import ABSStore  # noqa: F401
+from zarr._storage.store import (  # noqa: F401
+    DEFAULT_ZARR_VERSION,
+    V3_DEPRECATION_MESSAGE,
+    BaseStore,
+    Store,
+    _get_hierarchy_metadata,
+    _get_metadata_suffix,
+    _listdir_from_keys,
+    _path_to_prefix,
+    _prefix_to_array_key,
+    _prefix_to_group_key,
+    _rename_from_keys,
+    _rename_metadata_v3,
+    _rmdir_from_keys,
+    _rmdir_from_keys_v3,
+    array_meta_key,
+    attrs_key,
+    data_root,
+    group_meta_key,
+    meta_root,
+)
+from zarr.context import Context
 from zarr.errors import (
-    MetadataError,
     BadCompressorError,
     ContainsArrayError,
     ContainsGroupError,
     FSPathExistNotDir,
+    MetadataError,
     ReadOnlyError,
 )
 from zarr.meta import encode_array_metadata, encode_group_metadata
+from zarr.types import DIMENSION_SEPARATOR
+from zarr.types import PathLike as Path
 from zarr.util import (
+    NoLock,
     buffer_size,
+    ensure_contiguous_ndarray_or_bytes,
     json_loads,
     nolock,
     normalize_chunks,
@@ -65,30 +89,6 @@
     normalize_shape,
     normalize_storage_path,
     retry_call,
-    ensure_contiguous_ndarray_or_bytes,
-)
-
-from zarr._storage.absstore import ABSStore  # noqa: F401
-from zarr._storage.store import (  # noqa: F401
-    _get_hierarchy_metadata,
-    _get_metadata_suffix,
-    _listdir_from_keys,
-    _rename_from_keys,
-    _rename_metadata_v3,
-    _rmdir_from_keys,
-    _rmdir_from_keys_v3,
-    _path_to_prefix,
-    _prefix_to_array_key,
-    _prefix_to_group_key,
-    array_meta_key,
-    attrs_key,
-    data_root,
-    group_meta_key,
-    meta_root,
-    DEFAULT_ZARR_VERSION,
-    BaseStore,
-    Store,
-    V3_DEPRECATION_MESSAGE,
 )
 
 __doctest_requires__ = {
diff --git a/zarr/tests/test_attrs.py b/zarr/tests/test_attrs.py
index 2d9553971..0d37923a3 100644
--- a/zarr/tests/test_attrs.py
+++ b/zarr/tests/test_attrs.py
@@ -1,15 +1,15 @@
 import json
-
 import pathlib
+
 import pytest
 
 import zarr
 from zarr._storage.store import meta_root
-from zarr.attrs import Attributes
-from zarr.storage import KVStore, DirectoryStore
 from zarr._storage.v3 import KVStoreV3
-from zarr.tests.util import CountingDict, CountingDictV3
+from zarr.attrs import Attributes
 from zarr.hierarchy import group
+from zarr.storage import DirectoryStore, KVStore
+from zarr.tests.util import CountingDict, CountingDictV3
 
 
 @pytest.fixture(params=[2, 3])
diff --git a/zarr/tests/test_convenience.py b/zarr/tests/test_convenience.py
index 7d190adc2..203336613 100644
--- a/zarr/tests/test_convenience.py
+++ b/zarr/tests/test_convenience.py
@@ -9,17 +9,26 @@
 from numpy.testing import assert_array_equal
 
 import zarr
+from zarr._storage.store import v3_api_available
+from zarr._storage.v3 import (
+    ConsolidatedMetadataStoreV3,
+    DirectoryStoreV3,
+    FSStoreV3,
+    KVStoreV3,
+    MemoryStoreV3,
+    SQLiteStoreV3,
+)
 from zarr.convenience import (
     consolidate_metadata,
     copy,
+    copy_all,
     copy_store,
     load,
     open,
     open_consolidated,
     save,
-    save_group,
     save_array,
-    copy_all,
+    save_group,
 )
 from zarr.core import Array
 from zarr.errors import CopyError
@@ -31,17 +40,8 @@
     MemoryStore,
     atexit_rmtree,
     data_root,
-    meta_root,
     getsize,
-)
-from zarr._storage.store import v3_api_available
-from zarr._storage.v3 import (
-    ConsolidatedMetadataStoreV3,
-    DirectoryStoreV3,
-    FSStoreV3,
-    KVStoreV3,
-    MemoryStoreV3,
-    SQLiteStoreV3,
+    meta_root,
 )
 from zarr.tests.util import have_fsspec
 
diff --git a/zarr/tests/test_core.py b/zarr/tests/test_core.py
index 730f72431..6a595f7f4 100644
--- a/zarr/tests/test_core.py
+++ b/zarr/tests/test_core.py
@@ -1,12 +1,13 @@
 import atexit
 import os
-import sys
 import pickle
 import shutil
-from typing import Any, Literal, Optional, Tuple, Union, Sequence
+import sys
 import unittest
 from itertools import zip_longest
 from tempfile import mkdtemp
+from typing import Any, Literal, Optional, Sequence, Tuple, Union
+
 import numpy as np
 import packaging.version
 import pytest
@@ -36,11 +37,22 @@
     BaseStore,
     v3_api_available,
 )
-from .._storage.v3_storage_transformers import ShardingStorageTransformer, v3_sharding_available
+from zarr._storage.v3 import (
+    ABSStoreV3,
+    DBMStoreV3,
+    DirectoryStoreV3,
+    FSStoreV3,
+    KVStoreV3,
+    LMDBStoreV3,
+    LRUStoreCacheV3,
+    RmdirV3,
+    SQLiteStoreV3,
+    StoreV3,
+)
 from zarr.core import Array
 from zarr.errors import ArrayNotFoundError, ContainsGroupError
 from zarr.meta import json_loads
-from zarr.n5 import N5Store, N5FSStore, n5_keywords
+from zarr.n5 import N5FSStore, N5Store, n5_keywords
 from zarr.storage import (
     ABSStore,
     DBMStore,
@@ -59,20 +71,7 @@
     meta_root,
     normalize_store_arg,
 )
-from zarr._storage.v3 import (
-    ABSStoreV3,
-    DBMStoreV3,
-    DirectoryStoreV3,
-    FSStoreV3,
-    KVStoreV3,
-    LMDBStoreV3,
-    LRUStoreCacheV3,
-    RmdirV3,
-    SQLiteStoreV3,
-    StoreV3,
-)
 from zarr.tests.test_storage_v3 import DummyStorageTransfomer
-from zarr.util import buffer_size
 from zarr.tests.util import (
     abs_container,
     have_bsddb3,
@@ -83,6 +82,9 @@
     skip_test_env_var,
 )
 from zarr.types import DIMENSION_SEPARATOR
+from zarr.util import buffer_size
+
+from .._storage.v3_storage_transformers import ShardingStorageTransformer, v3_sharding_available
 
 # noinspection PyMethodMayBeStatic
 
diff --git a/zarr/tests/test_creation.py b/zarr/tests/test_creation.py
index 8e586abff..db1944439 100644
--- a/zarr/tests/test_creation.py
+++ b/zarr/tests/test_creation.py
@@ -7,7 +7,8 @@
 import pytest
 from numpy.testing import assert_array_equal
 
-from zarr._storage.store import DEFAULT_ZARR_VERSION
+from zarr._storage.store import DEFAULT_ZARR_VERSION, v3_api_available
+from zarr._storage.v3 import DirectoryStoreV3, KVStoreV3
 from zarr.codecs import Zlib
 from zarr.core import Array
 from zarr.creation import (
@@ -27,12 +28,9 @@
 from zarr.hierarchy import open_group
 from zarr.n5 import N5Store
 from zarr.storage import DirectoryStore, KVStore
-from zarr._storage.store import v3_api_available
-from zarr._storage.v3 import DirectoryStoreV3, KVStoreV3
 from zarr.sync import ThreadSynchronizer
 from zarr.tests.test_storage_v3 import DummyStorageTransfomer
-from zarr.tests.util import mktemp, have_fsspec
-
+from zarr.tests.util import have_fsspec, mktemp
 
 _VERSIONS = (None, 2, 3) if v3_api_available else (None, 2)
 _VERSIONS2 = (2, 3) if v3_api_available else (2,)
diff --git a/zarr/tests/test_dim_separator.py b/zarr/tests/test_dim_separator.py
index 0a5814e65..6554e024b 100644
--- a/zarr/tests/test_dim_separator.py
+++ b/zarr/tests/test_dim_separator.py
@@ -1,15 +1,14 @@
 import pathlib
+from functools import partial
 
 import pytest
 from numpy.testing import assert_array_equal
-from functools import partial
 
 import zarr
 from zarr.core import Array
-from zarr.storage import DirectoryStore, NestedDirectoryStore, FSStore
+from zarr.storage import DirectoryStore, FSStore, NestedDirectoryStore
 from zarr.tests.util import have_fsspec
 
-
 needs_fsspec = pytest.mark.skipif(not have_fsspec, reason="needs fsspec")
 
 
diff --git a/zarr/tests/test_hierarchy.py b/zarr/tests/test_hierarchy.py
index 161e1eb81..dc2494750 100644
--- a/zarr/tests/test_hierarchy.py
+++ b/zarr/tests/test_hierarchy.py
@@ -1,9 +1,9 @@
 import atexit
 import operator
 import os
-import sys
 import pickle
 import shutil
+import sys
 import tempfile
 import textwrap
 import unittest
@@ -20,6 +20,18 @@
 from numpy.testing import assert_array_equal
 
 from zarr._storage.store import _get_metadata_suffix, v3_api_available
+from zarr._storage.v3 import (
+    ABSStoreV3,
+    DBMStoreV3,
+    DirectoryStoreV3,
+    FSStoreV3,
+    KVStoreV3,
+    LMDBStoreV3,
+    LRUStoreCacheV3,
+    MemoryStoreV3,
+    SQLiteStoreV3,
+    ZipStoreV3,
+)
 from zarr.attrs import Attributes
 from zarr.core import Array
 from zarr.creation import open_array
@@ -27,9 +39,9 @@
 from zarr.storage import (
     ABSStore,
     DBMStore,
-    KVStore,
     DirectoryStore,
     FSStore,
+    KVStore,
     LMDBStore,
     LRUStoreCache,
     MemoryStore,
@@ -45,21 +57,8 @@
     init_group,
     meta_root,
 )
-from zarr._storage.v3 import (
-    ABSStoreV3,
-    KVStoreV3,
-    DirectoryStoreV3,
-    MemoryStoreV3,
-    FSStoreV3,
-    ZipStoreV3,
-    DBMStoreV3,
-    LMDBStoreV3,
-    SQLiteStoreV3,
-    LRUStoreCacheV3,
-)
+from zarr.tests.util import abs_container, have_fsspec, mktemp, skip_test_env_var
 from zarr.util import InfoReporter, buffer_size
-from zarr.tests.util import skip_test_env_var, have_fsspec, abs_container, mktemp
-
 
 _VERSIONS = (2, 3) if v3_api_available else (2,)
 
diff --git a/zarr/tests/test_indexing.py b/zarr/tests/test_indexing.py
index a3afc101c..156f4b300 100644
--- a/zarr/tests/test_indexing.py
+++ b/zarr/tests/test_indexing.py
@@ -5,14 +5,13 @@
 
 import zarr
 from zarr.indexing import (
+    PartialChunkIterator,
     make_slice_selection,
     normalize_integer_selection,
     oindex,
     oindex_set,
     replace_ellipsis,
-    PartialChunkIterator,
 )
-
 from zarr.tests.util import CountingDict
 
 
diff --git a/zarr/tests/test_meta.py b/zarr/tests/test_meta.py
index f9010d678..effc11355 100644
--- a/zarr/tests/test_meta.py
+++ b/zarr/tests/test_meta.py
@@ -9,18 +9,18 @@
 from zarr.errors import MetadataError
 from zarr.meta import (
     ZARR_FORMAT,
+    Metadata3,
+    _default_entry_point_metadata_v3,
+    _v3_complex_types,
+    _v3_datetime_types,
     decode_array_metadata,
     decode_dtype,
+    decode_fill_value,
     decode_group_metadata,
     encode_array_metadata,
     encode_dtype,
     encode_fill_value,
-    decode_fill_value,
     get_extended_dtype_info,
-    _v3_complex_types,
-    _v3_datetime_types,
-    _default_entry_point_metadata_v3,
-    Metadata3,
 )
 from zarr.util import normalize_dtype, normalize_fill_value
 
diff --git a/zarr/tests/test_meta_array.py b/zarr/tests/test_meta_array.py
index 2545c6d62..9313dcdff 100644
--- a/zarr/tests/test_meta_array.py
+++ b/zarr/tests/test_meta_array.py
@@ -1,7 +1,7 @@
 from typing import Optional
+
 import numpy as np
 import pytest
-
 from numcodecs.abc import Codec
 from numcodecs.compat import ensure_contiguous_ndarray_like
 from numcodecs.registry import get_codec, register_codec
@@ -9,7 +9,7 @@
 import zarr.codecs
 from zarr.core import Array
 from zarr.creation import array, empty, full, ones, open_array, zeros
-from zarr.hierarchy import open_group, group
+from zarr.hierarchy import group, open_group
 from zarr.storage import DirectoryStore, MemoryStore, Store, ZipStore
 
 
diff --git a/zarr/tests/test_n5.py b/zarr/tests/test_n5.py
index 2602aa06c..b66cc4fcf 100644
--- a/zarr/tests/test_n5.py
+++ b/zarr/tests/test_n5.py
@@ -1,14 +1,14 @@
+import atexit
+import json
+from typing import Tuple
+
+import numpy as np
 import pytest
+from numcodecs import GZip
 
-from zarr.n5 import N5ChunkWrapper, N5FSStore
 from zarr.creation import create
+from zarr.n5 import N5ChunkWrapper, N5FSStore
 from zarr.storage import atexit_rmtree
-from numcodecs import GZip
-import numpy as np
-from typing import Tuple
-import json
-import atexit
-
 from zarr.tests.util import have_fsspec
 
 
diff --git a/zarr/tests/test_storage.py b/zarr/tests/test_storage.py
index da690f595..95357d142 100644
--- a/zarr/tests/test_storage.py
+++ b/zarr/tests/test_storage.py
@@ -3,9 +3,9 @@
 import json
 import os
 import pathlib
-import sys
 import pickle
 import shutil
+import sys
 import tempfile
 from contextlib import contextmanager
 from pickle import PicklingError
@@ -13,25 +13,26 @@
 
 import numpy as np
 import pytest
-from numpy.testing import assert_array_almost_equal, assert_array_equal
-
 from numcodecs.compat import ensure_bytes
+from numpy.testing import assert_array_almost_equal, assert_array_equal
 
 import zarr
 from zarr._storage.store import _get_hierarchy_metadata
+from zarr._storage.v3 import KVStoreV3
 from zarr.codecs import BZ2, AsType, Blosc, Zlib
 from zarr.context import Context
 from zarr.convenience import consolidate_metadata
 from zarr.errors import ContainsArrayError, ContainsGroupError, MetadataError
 from zarr.hierarchy import group
 from zarr.meta import ZARR_FORMAT, decode_array_metadata
-from zarr.n5 import N5Store, N5FSStore, N5_FORMAT, n5_attrs_key
+from zarr.n5 import N5_FORMAT, N5FSStore, N5Store, n5_attrs_key
 from zarr.storage import (
     ABSStore,
     ConsolidatedMetadataStore,
     DBMStore,
     DictStore,
     DirectoryStore,
+    FSStore,
     KVStore,
     LMDBStore,
     LRUStoreCache,
@@ -53,13 +54,13 @@
     group_meta_key,
     init_array,
     init_group,
-    migrate_1to2,
+    listdir,
     meta_root,
+    migrate_1to2,
     normalize_store_arg,
+    rename,
 )
-from zarr.storage import FSStore, rename, listdir
-from zarr._storage.v3 import KVStoreV3
-from zarr.tests.util import CountingDict, have_fsspec, skip_test_env_var, abs_container, mktemp
+from zarr.tests.util import CountingDict, abs_container, have_fsspec, mktemp, skip_test_env_var
 from zarr.util import ConstantMap, json_dumps
 
 
diff --git a/zarr/tests/test_storage_v3.py b/zarr/tests/test_storage_v3.py
index e8675786e..608d0931d 100644
--- a/zarr/tests/test_storage_v3.py
+++ b/zarr/tests/test_storage_v3.py
@@ -11,23 +11,10 @@
 
 import zarr
 from zarr._storage.store import (
+    StorageTransformer,
     _get_hierarchy_metadata,
     assert_zarr_v3_api_available,
     v3_api_available,
-    StorageTransformer,
-)
-from zarr._storage.v3_storage_transformers import ShardingStorageTransformer, v3_sharding_available
-from zarr.core import Array
-from zarr.meta import _default_entry_point_metadata_v3
-from zarr.storage import (
-    atexit_rmglob,
-    atexit_rmtree,
-    data_root,
-    default_compressor,
-    getsize,
-    init_array,
-    meta_root,
-    normalize_store_arg,
 )
 from zarr._storage.v3 import (
     ABSStoreV3,
@@ -46,7 +33,20 @@
     StoreV3,
     ZipStoreV3,
 )
-from zarr.tests.util import CountingDictV3, have_fsspec, skip_test_env_var, mktemp
+from zarr._storage.v3_storage_transformers import ShardingStorageTransformer, v3_sharding_available
+from zarr.core import Array
+from zarr.meta import _default_entry_point_metadata_v3
+from zarr.storage import (
+    atexit_rmglob,
+    atexit_rmtree,
+    data_root,
+    default_compressor,
+    getsize,
+    init_array,
+    meta_root,
+    normalize_store_arg,
+)
+from zarr.tests.util import CountingDictV3, have_fsspec, mktemp, skip_test_env_var
 
 # pytest will fail to run if the following fixtures aren't imported here
 from .test_storage import StoreTests as _StoreTests
@@ -67,7 +67,6 @@
 from .test_storage import TestZipStore as _TestZipStore
 from .test_storage import dimension_separator_fixture, s3, skip_if_nested_chunks  # noqa
 
-
 pytestmark = pytest.mark.skipif(not v3_api_available, reason="v3 api is not available")
 
 
diff --git a/zarr/tests/test_util.py b/zarr/tests/test_util.py
index d908c7b2d..27ba45462 100644
--- a/zarr/tests/test_util.py
+++ b/zarr/tests/test_util.py
@@ -23,8 +23,8 @@
     normalize_shape,
     retry_call,
     tree_array_icon,
-    tree_group_icon,
     tree_get_icon,
+    tree_group_icon,
     tree_widget,
 )
 
diff --git a/zarr/tests/util.py b/zarr/tests/util.py
index b3c3249ca..13175c042 100644
--- a/zarr/tests/util.py
+++ b/zarr/tests/util.py
@@ -2,13 +2,13 @@
 import os
 import tempfile
 from typing import Any, Mapping, Sequence
-from zarr.context import Context
-
-from zarr.storage import Store
-from zarr._storage.v3 import StoreV3
 
 import pytest
 
+from zarr._storage.v3 import StoreV3
+from zarr.context import Context
+from zarr.storage import Store
+
 
 class CountingDict(Store):
     def __init__(self):
@@ -94,8 +94,8 @@ def skip_test_env_var(name):
 
 
 def abs_container():
-    from azure.core.exceptions import ResourceExistsError
     import azure.storage.blob as asb
+    from azure.core.exceptions import ResourceExistsError
 
     URL = "http://127.0.0.1:10000"
     ACCOUNT_NAME = "devstoreaccount1"
diff --git a/zarr/util.py b/zarr/util.py
index 8a96f92c2..60ec5808c 100644
--- a/zarr/util.py
+++ b/zarr/util.py
@@ -1,36 +1,37 @@
 import inspect
 import json
 import math
-import numbers
-from textwrap import TextWrapper
 import mmap
+import numbers
 import time
+from textwrap import TextWrapper
 from typing import (
     Any,
     Callable,
     Dict,
+    Iterable,
     Iterator,
     Mapping,
     Optional,
     Tuple,
     TypeVar,
     Union,
-    Iterable,
     cast,
 )
 
 import numpy as np
 from asciitree import BoxStyle, LeftAligned
 from asciitree.traversal import Traversal
+from numcodecs.blosc import cbuffer_metainfo, cbuffer_sizes
 from numcodecs.compat import (
-    ensure_text,
-    ensure_ndarray_like,
     ensure_bytes,
     ensure_contiguous_ndarray_like,
+    ensure_ndarray_like,
+    ensure_text,
 )
 from numcodecs.ndarray_like import NDArrayLike
 from numcodecs.registry import codec_registry
-from numcodecs.blosc import cbuffer_sizes, cbuffer_metainfo
+
 from zarr.types import DIMENSION_SEPARATOR
 
 KeyType = TypeVar("KeyType")