diff --git a/data/hooks/diagnosis/14-ports.py b/data/hooks/diagnosis/14-ports.py
index 38f6e0089..eec2e5f03 100644
--- a/data/hooks/diagnosis/14-ports.py
+++ b/data/hooks/diagnosis/14-ports.py
@@ -3,7 +3,6 @@
 import os
 
 from yunohost.diagnosis import Diagnoser
-from yunohost.utils.error import YunohostError
 from yunohost.service import _get_services
 
 class PortsDiagnoser(Diagnoser):
diff --git a/data/hooks/diagnosis/21-web.py b/data/hooks/diagnosis/21-web.py
index c1f6d912a..94665a6e6 100644
--- a/data/hooks/diagnosis/21-web.py
+++ b/data/hooks/diagnosis/21-web.py
@@ -8,7 +8,6 @@ from moulinette.utils.filesystem import read_file
 
 from yunohost.diagnosis import Diagnoser
 from yunohost.domain import domain_list
-from yunohost.utils.error import YunohostError
 
 DIAGNOSIS_SERVER = "diagnosis.yunohost.org"
 
diff --git a/data/hooks/diagnosis/70-regenconf.py b/data/hooks/diagnosis/70-regenconf.py
index 0dff71b5b..396f64a0f 100644
--- a/data/hooks/diagnosis/70-regenconf.py
+++ b/data/hooks/diagnosis/70-regenconf.py
@@ -2,7 +2,6 @@
 
 import os
 
-import subprocess
 from yunohost.diagnosis import Diagnoser
 from yunohost.regenconf import _get_regenconf_infos, _calculate_hash
 
diff --git a/src/yunohost/app.py b/src/yunohost/app.py
index f9f31c64a..0caa9d5e1 100644
--- a/src/yunohost/app.py
+++ b/src/yunohost/app.py
@@ -681,7 +681,7 @@ def app_install(operation_logger, app, label=None, args=None, no_remove_on_failu
 
     from yunohost.hook import hook_add, hook_remove, hook_exec, hook_callback
     from yunohost.log import OperationLogger
-    from yunohost.permission import user_permission_list, permission_create, permission_url, permission_delete, permission_sync_to_user, user_permission_update
+    from yunohost.permission import user_permission_list, permission_create, permission_url, permission_delete, permission_sync_to_user
     from yunohost.regenconf import manually_modified_files
 
     # Fetch or extract sources
diff --git a/src/yunohost/backup.py b/src/yunohost/backup.py
index bfe958a89..14d96f45c 100644
--- a/src/yunohost/backup.py
+++ b/src/yunohost/backup.py
@@ -894,8 +894,6 @@ class RestoreManager():
         """
         from permission import permission_sync_to_user
 
-        successfull_apps = self.targets.list("apps", include=["Success", "Warning"])
-
         permission_sync_to_user()
 
         if os.path.ismount(self.work_dir):
@@ -1160,7 +1158,7 @@ class RestoreManager():
             return
 
         from yunohost.user import user_group_list
-        from yunohost.permission import permission_create, permission_delete, user_permission_update, user_permission_list, permission_sync_to_user
+        from yunohost.permission import permission_create, permission_delete, user_permission_list, permission_sync_to_user
 
         # Backup old permission for apps
         # We need to do that because in case of an app is installed we can't remove the permission for this app
@@ -1257,7 +1255,7 @@ class RestoreManager():
                              name should be already install)
         """
         from yunohost.user import user_group_list
-        from yunohost.permission import permission_create, permission_delete, user_permission_list, user_permission_update, permission_sync_to_user
+        from yunohost.permission import permission_create, permission_delete, user_permission_list, permission_sync_to_user
 
         def copytree(src, dst, symlinks=False, ignore=None):
             for item in os.listdir(src):
diff --git a/src/yunohost/data_migrations/0016_php70_to_php73_pools.py b/src/yunohost/data_migrations/0016_php70_to_php73_pools.py
index 1cdb2bc4d..73875d359 100644
--- a/src/yunohost/data_migrations/0016_php70_to_php73_pools.py
+++ b/src/yunohost/data_migrations/0016_php70_to_php73_pools.py
@@ -4,7 +4,7 @@ from shutil import copy2
 
 from moulinette.utils.log import getActionLogger
 
-from yunohost.app import _is_installed, _get_app_settings, _set_app_settings, _patch_legacy_php_versions_in_settings
+from yunohost.app import _is_installed, _patch_legacy_php_versions_in_settings
 from yunohost.tools import Migration
 from yunohost.service import _run_service_command
 
diff --git a/src/yunohost/data_migrations/0017_postgresql_9p6_to_11.py b/src/yunohost/data_migrations/0017_postgresql_9p6_to_11.py
index 955393c5b..3cb904613 100644
--- a/src/yunohost/data_migrations/0017_postgresql_9p6_to_11.py
+++ b/src/yunohost/data_migrations/0017_postgresql_9p6_to_11.py
@@ -28,7 +28,7 @@ class MyMigration(Migration):
         # Make sure there's a 9.6 cluster
         try:
             self.runcmd("pg_lsclusters | grep -q '^9.6 '")
-        except Exception as e:
+        except Exception:
             logger.warning("It looks like there's not active 9.6 cluster, so probably don't need to run this migration")
             return
 
diff --git a/src/yunohost/firewall.py b/src/yunohost/firewall.py
index 4c3cfb0f7..c17e958e7 100644
--- a/src/yunohost/firewall.py
+++ b/src/yunohost/firewall.py
@@ -24,7 +24,6 @@
     Manage firewall rules
 """
 import os
-import sys
 import yaml
 import miniupnpc
 
diff --git a/src/yunohost/permission.py b/src/yunohost/permission.py
index 67a0f57b0..cd81489a2 100644
--- a/src/yunohost/permission.py
+++ b/src/yunohost/permission.py
@@ -31,7 +31,6 @@ import random
 from moulinette import m18n
 from moulinette.utils.log import getActionLogger
 from yunohost.utils.error import YunohostError
-from yunohost.user import user_list
 from yunohost.log import is_unit_operation
 
 logger = getActionLogger('yunohost.user')
diff --git a/src/yunohost/regenconf.py b/src/yunohost/regenconf.py
index 6c9b10aac..7f4f73247 100644
--- a/src/yunohost/regenconf.py
+++ b/src/yunohost/regenconf.py
@@ -21,7 +21,6 @@
 
 import os
 import yaml
-import json
 import subprocess
 import shutil
 import hashlib
@@ -31,7 +30,6 @@ from datetime import datetime
 
 from moulinette import m18n
 from moulinette.utils import log, filesystem
-from moulinette.utils.filesystem import read_file
 
 from yunohost.utils.error import YunohostError
 from yunohost.log import is_unit_operation
diff --git a/src/yunohost/tests/test_appscatalog.py b/src/yunohost/tests/test_appscatalog.py
index 40cf1489f..d9f0c14e5 100644
--- a/src/yunohost/tests/test_appscatalog.py
+++ b/src/yunohost/tests/test_appscatalog.py
@@ -6,7 +6,7 @@ import glob
 import shutil
 
 from moulinette import m18n
-from moulinette.utils.filesystem import read_json, write_to_json, write_to_yaml, mkdir
+from moulinette.utils.filesystem import read_json, write_to_json, write_to_yaml
 
 from yunohost.utils.error import YunohostError
 from yunohost.app import (_initialize_apps_catalog_system,
diff --git a/src/yunohost/tests/test_permission.py b/src/yunohost/tests/test_permission.py
index 82ec151f3..4dfc1ce6b 100644
--- a/src/yunohost/tests/test_permission.py
+++ b/src/yunohost/tests/test_permission.py
@@ -4,7 +4,7 @@ import os
 
 from conftest import message, raiseYunohostError, get_test_apps_dir
 
-from yunohost.app import app_install, app_remove, app_change_url, app_list, app_map, _installed_apps
+from yunohost.app import app_install, app_remove, app_change_url, app_map, _installed_apps
 from yunohost.user import user_list, user_create, user_delete, \
                           user_group_list, user_group_delete
 from yunohost.permission import user_permission_update, user_permission_list, user_permission_reset, \
@@ -370,16 +370,6 @@ def test_permission_reset_idempotency():
     assert set(res['blog.main']['corresponding_users']) == set(["alice", "bob"])
 
 
-def test_permission_reset_idempotency():
-    # Reset permission
-    user_permission_reset("blog.main")
-    user_permission_reset("blog.main")
-
-    res = user_permission_list(full=True)['permissions']
-    assert res['blog.main']['allowed'] == ["all_users"]
-    assert set(res['blog.main']['corresponding_users']) == set(["alice", "bob"])
-
-
 #
 # Error on update function
 #
diff --git a/src/yunohost/tests/test_settings.py b/src/yunohost/tests/test_settings.py
index 3fdfce67c..c7105fd1b 100644
--- a/src/yunohost/tests/test_settings.py
+++ b/src/yunohost/tests/test_settings.py
@@ -64,10 +64,10 @@ def test_settings_list():
 
 def test_settings_set():
     settings_set("example.bool", False)
-    assert settings_get("example.bool") == False
+    assert settings_get("example.bool") is False
 
     settings_set("example.bool", "on")
-    assert settings_get("example.bool") == True
+    assert settings_get("example.bool") is True
 
 def test_settings_set_int():
     settings_set("example.int", 21)
diff --git a/src/yunohost/tools.py b/src/yunohost/tools.py
index b6d45b03c..2e90b38ee 100644
--- a/src/yunohost/tools.py
+++ b/src/yunohost/tools.py
@@ -26,10 +26,8 @@
 import re
 import os
 import yaml
-import json
 import subprocess
 import pwd
-import socket
 from importlib import import_module
 
 from moulinette import msignals, m18n
@@ -37,8 +35,8 @@ from moulinette.utils.log import getActionLogger
 from moulinette.utils.process import check_output, call_async_output
 from moulinette.utils.filesystem import read_json, write_to_json, read_yaml, write_to_yaml
 
-from yunohost.app import _update_apps_catalog, app_info, app_upgrade, app_ssowatconf, app_list, _initialize_apps_catalog_system
-from yunohost.domain import domain_add, domain_list
+from yunohost.app import _update_apps_catalog, app_info, app_upgrade, _initialize_apps_catalog_system
+from yunohost.domain import domain_add
 from yunohost.dyndns import _dyndns_available, _dyndns_provides
 from yunohost.firewall import firewall_upnp
 from yunohost.service import service_start, service_enable
@@ -118,7 +116,7 @@ def tools_ldapinit():
         if not os.path.isdir('/home/{0}'.format("admin")):
             logger.warning(m18n.n('user_home_creation_failed'),
                            exc_info=1)
-        
+
     logger.success(m18n.n('ldap_initialized'))
 
 
diff --git a/src/yunohost/user.py b/src/yunohost/user.py
index d19da177c..35b316859 100644
--- a/src/yunohost/user.py
+++ b/src/yunohost/user.py
@@ -27,7 +27,6 @@ import os
 import re
 import pwd
 import grp
-import json
 import crypt
 import random
 import string
@@ -36,7 +35,6 @@ import copy
 
 from moulinette import m18n
 from moulinette.utils.log import getActionLogger
-from moulinette.utils.filesystem import read_json, write_to_json, read_yaml, write_to_yaml
 
 from yunohost.utils.error import YunohostError
 from yunohost.service import service_status
@@ -239,7 +237,6 @@ def user_delete(operation_logger, username, purge=False):
     """
     from yunohost.hook import hook_callback
     from yunohost.utils.ldap import _get_ldap_interface
-    from yunohost.permission import permission_sync_to_user
 
     if username not in user_list()["users"]:
         raise YunohostError('user_unknown', user=username)
diff --git a/src/yunohost/utils/password.py b/src/yunohost/utils/password.py
index b4f7025f7..e7ff6c275 100644
--- a/src/yunohost/utils/password.py
+++ b/src/yunohost/utils/password.py
@@ -63,7 +63,7 @@ class PasswordValidator(object):
             settings = json.load(open('/etc/yunohost/settings.json', "r"))
             setting_key = "security.password." + profile + ".strength"
             self.validation_strength = int(settings[setting_key]["value"])
-        except Exception as e:
+        except Exception:
             # Fallback to default value if we can't fetch settings for some reason
             self.validation_strength = 1
 
@@ -83,11 +83,7 @@ class PasswordValidator(object):
         # on top (at least not the moulinette ones)
         # because the moulinette needs to be correctly initialized
         # as well as modules available in python's path.
-        import logging
         from yunohost.utils.error import YunohostError
-        from moulinette.utils.log import getActionLogger
-
-        logger = logging.getLogger('yunohost.utils.password')
 
         status, msg = self.validation_summary(password)
         if status == "error":
diff --git a/tests/remove_stale_translated_strings.py b/tests/remove_stale_translated_strings.py
index 0213bc2be..4e39f131e 100644
--- a/tests/remove_stale_translated_strings.py
+++ b/tests/remove_stale_translated_strings.py
@@ -1,4 +1,3 @@
-import re
 import json
 import glob
 from collections import OrderedDict