diff --git a/datumaro/cli/commands/add.py b/datumaro/cli/commands/add.py
index c43936ec81..4f12975aca 100644
--- a/datumaro/cli/commands/add.py
+++ b/datumaro/cli/commands/add.py
@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-# pylint: disable=unused-import
-
 from ..contexts.source import build_add_parser as build_parser
+
+__all__ = [
+    'build_parser',
+]
diff --git a/datumaro/cli/commands/create.py b/datumaro/cli/commands/create.py
index 1396d5f9ed..bc3a6de7fe 100644
--- a/datumaro/cli/commands/create.py
+++ b/datumaro/cli/commands/create.py
@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-# pylint: disable=unused-import
+from ..contexts.project import build_create_parser as build_parser
 
-from ..contexts.project import build_create_parser as build_parser
\ No newline at end of file
+__all__ = [
+    'build_parser',
+]
diff --git a/datumaro/cli/commands/diff.py b/datumaro/cli/commands/diff.py
index a50c8f0a4e..3c4ce32714 100644
--- a/datumaro/cli/commands/diff.py
+++ b/datumaro/cli/commands/diff.py
@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-# pylint: disable=unused-import
+from ..contexts.project import build_diff_parser as build_parser
 
-from ..contexts.project import build_diff_parser as build_parser
\ No newline at end of file
+__all__ = [
+    'build_parser',
+]
diff --git a/datumaro/cli/commands/ediff.py b/datumaro/cli/commands/ediff.py
index ac5ba8c467..e835d2e58f 100644
--- a/datumaro/cli/commands/ediff.py
+++ b/datumaro/cli/commands/ediff.py
@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-# pylint: disable=unused-import
+from ..contexts.project import build_ediff_parser as build_parser
 
-from ..contexts.project import build_ediff_parser as build_parser
\ No newline at end of file
+__all__ = [
+    'build_parser',
+]
diff --git a/datumaro/cli/commands/export.py b/datumaro/cli/commands/export.py
index 1efb506459..52bf5505e6 100644
--- a/datumaro/cli/commands/export.py
+++ b/datumaro/cli/commands/export.py
@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-# pylint: disable=unused-import
+from ..contexts.project import build_export_parser as build_parser
 
-from ..contexts.project import build_export_parser as build_parser
\ No newline at end of file
+__all__ = [
+    'build_parser',
+]
diff --git a/datumaro/cli/commands/filter.py b/datumaro/cli/commands/filter.py
index 0b0d28cb9f..13468665a6 100644
--- a/datumaro/cli/commands/filter.py
+++ b/datumaro/cli/commands/filter.py
@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-# pylint: disable=unused-import
+from ..contexts.project import build_filter_parser as build_parser
 
-from ..contexts.project import build_filter_parser as build_parser
\ No newline at end of file
+__all__ = [
+    'build_parser',
+]
diff --git a/datumaro/cli/commands/import_.py b/datumaro/cli/commands/import_.py
index 74c47ab3cc..0d6ef829c0 100644
--- a/datumaro/cli/commands/import_.py
+++ b/datumaro/cli/commands/import_.py
@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-# pylint: disable=unused-import
+from ..contexts.project import build_import_parser as build_parser
 
-from ..contexts.project import build_import_parser as build_parser
\ No newline at end of file
+__all__ = [
+    'build_parser',
+]
diff --git a/datumaro/cli/commands/info.py b/datumaro/cli/commands/info.py
index fa2af5ddd9..e6c693bbf3 100644
--- a/datumaro/cli/commands/info.py
+++ b/datumaro/cli/commands/info.py
@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-# pylint: disable=unused-import
+from ..contexts.project import build_info_parser as build_parser
 
-from ..contexts.project import build_info_parser as build_parser
\ No newline at end of file
+__all__ = [
+    'build_parser',
+]
diff --git a/datumaro/cli/commands/remove.py b/datumaro/cli/commands/remove.py
index 3ea0bbffa9..003c36f800 100644
--- a/datumaro/cli/commands/remove.py
+++ b/datumaro/cli/commands/remove.py
@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-# pylint: disable=unused-import
+from ..contexts.source import build_remove_parser as build_parser
 
-from ..contexts.source import build_remove_parser as build_parser
\ No newline at end of file
+__all__ = [
+    'build_parser',
+]
diff --git a/datumaro/cli/commands/stats.py b/datumaro/cli/commands/stats.py
index cb54eec394..fdbb75bbae 100644
--- a/datumaro/cli/commands/stats.py
+++ b/datumaro/cli/commands/stats.py
@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-# pylint: disable=unused-import
+from ..contexts.project import build_stats_parser as build_parser
 
-from ..contexts.project import build_stats_parser as build_parser
\ No newline at end of file
+__all__ = [
+    'build_parser',
+]
diff --git a/datumaro/cli/commands/transform.py b/datumaro/cli/commands/transform.py
index 474d6a2128..ff4d509486 100644
--- a/datumaro/cli/commands/transform.py
+++ b/datumaro/cli/commands/transform.py
@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-# pylint: disable=unused-import
+from ..contexts.project import build_transform_parser as build_parser
 
-from ..contexts.project import build_transform_parser as build_parser
\ No newline at end of file
+__all__ = [
+    'build_parser',
+]
diff --git a/datumaro/cli/commands/validate.py b/datumaro/cli/commands/validate.py
index 13794187a7..94ed9c6232 100644
--- a/datumaro/cli/commands/validate.py
+++ b/datumaro/cli/commands/validate.py
@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-# pylint: disable=unused-import
-
 from ..contexts.project import build_validate_parser as build_parser
+
+__all__ = [
+    'build_parser',
+]
diff --git a/datumaro/util/__init__.py b/datumaro/util/__init__.py
index 3280eb4e1c..7d1af4031a 100644
--- a/datumaro/util/__init__.py
+++ b/datumaro/util/__init__.py
@@ -1,18 +1,20 @@
 
-# Copyright (C) 2019-2020 Intel Corporation
+# Copyright (C) 2019-2021 Intel Corporation
 #
 # SPDX-License-Identifier: MIT
 
 from contextlib import ExitStack
-from distutils.util import strtobool as str_to_bool # pylint: disable=unused-import
 from functools import partial, wraps
 from itertools import islice
 from typing import Iterable, Tuple
-import attr
+import distutils.util
 
+import attr
 
 NOTSET = object()
 
+str_to_bool = distutils.util.strtobool
+
 def find(iterable, pred=lambda x: True, default=None):
     return next((x for x in iterable if pred(x)), default)
 
diff --git a/datumaro/util/image.py b/datumaro/util/image.py
index 2f8c6056e6..514d74f052 100644
--- a/datumaro/util/image.py
+++ b/datumaro/util/image.py
@@ -3,9 +3,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-# pylint: disable=unused-import
-
 from enum import Enum, auto
+import importlib
 from io import BytesIO
 from typing import Any, Callable, Iterator, Iterable, Optional, Tuple, Union
 import os
@@ -18,7 +17,7 @@ class _IMAGE_BACKENDS(Enum):
 _IMAGE_BACKEND = None
 _image_loading_errors = (FileNotFoundError, )
 try:
-    import cv2
+    importlib.import_module('cv2')
     _IMAGE_BACKEND = _IMAGE_BACKENDS.cv2
 except ImportError:
     import PIL