diff --git a/searx/engines/acgsou.py b/searx/engines/acgsou.py
index 7bab64f5..553b49b6 100644
--- a/searx/engines/acgsou.py
+++ b/searx/engines/acgsou.py
@@ -11,7 +11,7 @@
 
 from urllib.parse import urlencode
 from lxml import html
-from searx.utils import extract_text, get_torrent_size, int_or_zero
+from searx.utils import extract_text, get_torrent_size
 
 # engine dependent config
 categories = ['files', 'images', 'videos', 'music']
diff --git a/searx/engines/arxiv.py b/searx/engines/arxiv.py
index 77ddc572..e54de4a5 100644
--- a/searx/engines/arxiv.py
+++ b/searx/engines/arxiv.py
@@ -11,7 +11,6 @@
  More info on api: https://arxiv.org/help/api/user-manual
 """
 
-from urllib.parse import urlencode
 from lxml import html
 from datetime import datetime
 
diff --git a/searx/engines/bing.py b/searx/engines/bing.py
index a4fa1db7..f0882fcc 100644
--- a/searx/engines/bing.py
+++ b/searx/engines/bing.py
@@ -16,8 +16,8 @@
 import re
 from urllib.parse import urlencode
 from lxml import html
-from searx import logger, utils
-from searx.utils import extract_text, match_language, gen_useragent, eval_xpath
+from searx import logger
+from searx.utils import eval_xpath, extract_text, match_language
 
 logger = logger.getChild('bing engine')
 
@@ -98,7 +98,6 @@ def response(resp):
             result_len = int(result_len_container)
     except Exception as e:
         logger.debug('result error :\n%s', e)
-        pass
 
     if result_len and _get_offset_from_pageno(resp.search_params.get("pageno", 0)) > result_len:
         return []
diff --git a/searx/engines/bing_images.py b/searx/engines/bing_images.py
index 10da42b5..3085e1de 100644
--- a/searx/engines/bing_images.py
+++ b/searx/engines/bing_images.py
@@ -15,10 +15,10 @@
 from urllib.parse import urlencode
 from lxml import html
 from json import loads
-import re
 from searx.utils import match_language
 
-from searx.engines.bing import _fetch_supported_languages, supported_languages_url, language_aliases
+from searx.engines.bing import language_aliases
+from searx.engines.bing import _fetch_supported_languages, supported_languages_url  # NOQA
 
 # engine dependent config
 categories = ['images']
diff --git a/searx/engines/bing_news.py b/searx/engines/bing_news.py
index fbe51fae..aeef7d19 100644
--- a/searx/engines/bing_news.py
+++ b/searx/engines/bing_news.py
@@ -16,7 +16,8 @@ from dateutil import parser
 from urllib.parse import urlencode, urlparse, parse_qsl
 from lxml import etree
 from searx.utils import list_get, match_language
-from searx.engines.bing import _fetch_supported_languages, supported_languages_url, language_aliases
+from searx.engines.bing import language_aliases
+from searx.engines.bing import _fetch_supported_languages, supported_languages_url  # NOQA
 
 # engine dependent config
 categories = ['news']
diff --git a/searx/engines/bing_videos.py b/searx/engines/bing_videos.py
index 63264de6..4393ea59 100644
--- a/searx/engines/bing_videos.py
+++ b/searx/engines/bing_videos.py
@@ -15,7 +15,8 @@ from lxml import html
 from urllib.parse import urlencode
 from searx.utils import match_language
 
-from searx.engines.bing import _fetch_supported_languages, supported_languages_url, language_aliases
+from searx.engines.bing import language_aliases
+from searx.engines.bing import _fetch_supported_languages, supported_languages_url  # NOQA
 
 categories = ['videos']
 paging = True
diff --git a/searx/engines/btdigg.py b/searx/engines/btdigg.py
index d73ee23a..72bda8d2 100644
--- a/searx/engines/btdigg.py
+++ b/searx/engines/btdigg.py
@@ -11,7 +11,6 @@
 """
 
 from lxml import html
-from operator import itemgetter
 from urllib.parse import quote, urljoin
 from searx.utils import extract_text, get_torrent_size
 
diff --git a/searx/engines/command.py b/searx/engines/command.py
index 1b73861f..08ee5da0 100644
--- a/searx/engines/command.py
+++ b/searx/engines/command.py
@@ -18,7 +18,6 @@ import re
 from os.path import expanduser, isabs, realpath, commonprefix
 from shlex import split as shlex_split
 from subprocess import Popen, PIPE
-from time import time
 from threading import Thread
 
 from searx import logger
diff --git a/searx/engines/currency_convert.py b/searx/engines/currency_convert.py
index 4a82cfdc..0e91d31e 100644
--- a/searx/engines/currency_convert.py
+++ b/searx/engines/currency_convert.py
@@ -1,10 +1,7 @@
 import json
 import re
 import unicodedata
-
-from datetime import datetime
-
-from searx.data import CURRENCIES
+from searx.data import CURRENCIES  # NOQA
 
 
 categories = []
diff --git a/searx/engines/deviantart.py b/searx/engines/deviantart.py
index b91816da..c06a79b7 100644
--- a/searx/engines/deviantart.py
+++ b/searx/engines/deviantart.py
@@ -15,7 +15,6 @@
 from lxml import html
 import re
 from urllib.parse import urlencode
-from searx.utils import extract_text
 
 
 # engine dependent config
diff --git a/searx/engines/digg.py b/searx/engines/digg.py
index 24a932d5..831d698b 100644
--- a/searx/engines/digg.py
+++ b/searx/engines/digg.py
@@ -12,10 +12,8 @@
 
 import random
 import string
-from dateutil import parser
 from json import loads
 from urllib.parse import urlencode
-from lxml import html
 from datetime import datetime
 
 # engine dependent config
diff --git a/searx/engines/duckduckgo.py b/searx/engines/duckduckgo.py
index a5397232..21cd926a 100644
--- a/searx/engines/duckduckgo.py
+++ b/searx/engines/duckduckgo.py
@@ -15,8 +15,6 @@
 
 from lxml.html import fromstring
 from json import loads
-from urllib.parse import urlencode
-from searx.poolrequests import get
 from searx.utils import extract_text, match_language, eval_xpath
 
 # engine dependent config
diff --git a/searx/engines/duckduckgo_definitions.py b/searx/engines/duckduckgo_definitions.py
index f8bc44e4..5758022d 100644
--- a/searx/engines/duckduckgo_definitions.py
+++ b/searx/engines/duckduckgo_definitions.py
@@ -15,11 +15,11 @@ from lxml import html
 
 from searx import logger
 from searx.data import WIKIDATA_UNITS
-from searx.engines.duckduckgo import _fetch_supported_languages, supported_languages_url, language_aliases
+from searx.engines.duckduckgo import language_aliases
+from searx.engines.duckduckgo import _fetch_supported_languages, supported_languages_url  # NOQA
 from searx.utils import extract_text, html_to_text, match_language, get_string_replaces_function
 from searx.external_urls import get_external_url, get_earth_coordinates_url, area_to_osm_zoom
 
-
 logger = logger.getChild('duckduckgo_definitions')
 
 URL = 'https://api.duckduckgo.com/'\
diff --git a/searx/engines/duckduckgo_images.py b/searx/engines/duckduckgo_images.py
index 27ef7442..943b7488 100644
--- a/searx/engines/duckduckgo_images.py
+++ b/searx/engines/duckduckgo_images.py
@@ -15,12 +15,9 @@
 
 from json import loads
 from urllib.parse import urlencode
-from searx.engines.duckduckgo import (
-    _fetch_supported_languages, supported_languages_url,
-    get_region_code, language_aliases
-)
+from searx.engines.duckduckgo import get_region_code
+from searx.engines.duckduckgo import _fetch_supported_languages, supported_languages_url  # NOQA
 from searx.poolrequests import get
-from searx.utils import extract_text
 
 # engine dependent config
 categories = ['images']
diff --git a/searx/engines/duden.py b/searx/engines/duden.py
index bbe11de9..1484a21e 100644
--- a/searx/engines/duden.py
+++ b/searx/engines/duden.py
@@ -60,7 +60,6 @@ def response(resp):
 
     except:
         logger.debug("Couldn't read number of results.")
-        pass
 
     for result in eval_xpath(dom, '//section[not(contains(@class, "essay"))]'):
         try:
diff --git a/searx/engines/elasticsearch.py b/searx/engines/elasticsearch.py
index bad65fb2..99e93d87 100644
--- a/searx/engines/elasticsearch.py
+++ b/searx/engines/elasticsearch.py
@@ -1,8 +1,5 @@
 from json import loads, dumps
-from lxml import html
-from urllib.parse import quote, urljoin
 from requests.auth import HTTPBasicAuth
-from searx.utils import extract_text, get_torrent_size
 
 
 base_url = 'http://localhost:9200'
diff --git a/searx/engines/google_images.py b/searx/engines/google_images.py
index 8cfb1e17..9669d81c 100644
--- a/searx/engines/google_images.py
+++ b/searx/engines/google_images.py
@@ -29,12 +29,9 @@ from lxml import html
 from flask_babel import gettext
 from searx import logger
 from searx.utils import extract_text, eval_xpath
+from searx.engines.google import _fetch_supported_languages, supported_languages_url  # NOQA
 
 # pylint: disable=unused-import
-from searx.engines.google import (
-    supported_languages_url,
-    _fetch_supported_languages,
-)
 # pylint: enable=unused-import
 
 from searx.engines.google import (
diff --git a/searx/engines/google_news.py b/searx/engines/google_news.py
index 08875328..6cfc0c8e 100644
--- a/searx/engines/google_news.py
+++ b/searx/engines/google_news.py
@@ -12,8 +12,8 @@
 
 from urllib.parse import urlencode
 from lxml import html
-from searx.engines.google import _fetch_supported_languages, supported_languages_url
 from searx.utils import match_language
+from searx.engines.google import _fetch_supported_languages, supported_languages_url  # NOQA
 
 # search-url
 categories = ['news']
diff --git a/searx/engines/google_videos.py b/searx/engines/google_videos.py
index 78e1eb1c..1e6c8b3e 100644
--- a/searx/engines/google_videos.py
+++ b/searx/engines/google_videos.py
@@ -11,7 +11,6 @@
 """
 
 from datetime import date, timedelta
-from json import loads
 from urllib.parse import urlencode
 from lxml import html
 from searx.utils import extract_text
diff --git a/searx/engines/piratebay.py b/searx/engines/piratebay.py
index b56b92a2..828241ec 100644
--- a/searx/engines/piratebay.py
+++ b/searx/engines/piratebay.py
@@ -12,8 +12,8 @@ from json import loads
 from datetime import datetime
 from operator import itemgetter
 
-from urllib.parse import quote, urljoin
-from searx.utils import extract_text, get_torrent_size
+from urllib.parse import quote
+from searx.utils import get_torrent_size
 
 # engine dependent config
 categories = ["videos", "music", "files"]
diff --git a/searx/engines/soundcloud.py b/searx/engines/soundcloud.py
index 5165ea3e..b1e01759 100644
--- a/searx/engines/soundcloud.py
+++ b/searx/engines/soundcloud.py
@@ -14,7 +14,6 @@ import re
 from json import loads
 from lxml import html
 from dateutil import parser
-from io import StringIO
 from urllib.parse import quote_plus, urlencode
 from searx import logger
 from searx.poolrequests import get as http_get
diff --git a/searx/engines/startpage.py b/searx/engines/startpage.py
index d26c2d10..90ed0a7a 100644
--- a/searx/engines/startpage.py
+++ b/searx/engines/startpage.py
@@ -17,7 +17,6 @@ import re
 from unicodedata import normalize, combining
 from babel import Locale
 from babel.localedata import locale_identifiers
-from searx.languages import language_codes
 from searx.utils import extract_text, eval_xpath, match_language
 
 # engine dependent config
diff --git a/searx/engines/wikidata.py b/searx/engines/wikidata.py
index 01e873de..3d8daca5 100644
--- a/searx/engines/wikidata.py
+++ b/searx/engines/wikidata.py
@@ -21,9 +21,9 @@ from babel.dates import format_datetime, format_date, format_time, get_datetime_
 from searx import logger
 from searx.data import WIKIDATA_UNITS
 from searx.poolrequests import post, get
-from searx.engines.wikipedia import _fetch_supported_languages, supported_languages_url
 from searx.utils import match_language, searx_useragent, get_string_replaces_function
 from searx.external_urls import get_external_url, get_earth_coordinates_url, area_to_osm_zoom
+from searx.engines.wikipedia import _fetch_supported_languages, supported_languages_url  # NOQA
 
 logger = logger.getChild('wikidata')
 
diff --git a/searx/engines/yahoo_news.py b/searx/engines/yahoo_news.py
index e9dd5d6d..11941cfe 100644
--- a/searx/engines/yahoo_news.py
+++ b/searx/engines/yahoo_news.py
@@ -13,9 +13,8 @@ import re
 from datetime import datetime, timedelta
 from urllib.parse import urlencode
 from lxml import html
-from searx.engines.yahoo import (
-    parse_url, _fetch_supported_languages, supported_languages_url, language_aliases
-)
+from searx.engines.yahoo import parse_url, language_aliases
+from searx.engines.yahoo import _fetch_supported_languages, supported_languages_url  # NOQA
 from dateutil import parser
 from searx.utils import extract_text, extract_url, match_language
 
diff --git a/searx/engines/youtube_noapi.py b/searx/engines/youtube_noapi.py
index 16c0edde..5f7d2cea 100644
--- a/searx/engines/youtube_noapi.py
+++ b/searx/engines/youtube_noapi.py
@@ -11,7 +11,6 @@
 from functools import reduce
 from json import loads
 from urllib.parse import quote_plus
-from searx.utils import extract_text, list_get
 
 # engine dependent config
 categories = ['videos', 'music']
diff --git a/searx/plugins/__init__.py b/searx/plugins/__init__.py
index 8221f7c1..fe7ae057 100644
--- a/searx/plugins/__init__.py
+++ b/searx/plugins/__init__.py
@@ -20,7 +20,6 @@ from importlib import import_module
 from os import listdir, makedirs, remove, stat, utime
 from os.path import abspath, basename, dirname, exists, join
 from shutil import copyfile
-from traceback import print_exc
 
 from searx import logger, settings, static_path
 
diff --git a/searx/results.py b/searx/results.py
index 34a94511..e0bbe335 100644
--- a/searx/results.py
+++ b/searx/results.py
@@ -1,5 +1,4 @@
 import re
-from collections import defaultdict
 from operator import itemgetter
 from threading import RLock
 from urllib.parse import urlparse, unquote
diff --git a/searx/utils.py b/searx/utils.py
index 9e43c67f..4eed87f2 100644
--- a/searx/utils.py
+++ b/searx/utils.py
@@ -7,7 +7,7 @@ from numbers import Number
 from os.path import splitext, join
 from random import choice
 from html.parser import HTMLParser
-from urllib.parse import urljoin, urlparse, unquote
+from urllib.parse import urljoin, urlparse
 
 from lxml import html
 from lxml.etree import XPath, _ElementStringResult, _ElementUnicodeResult
diff --git a/searx/webapp.py b/searx/webapp.py
index 326200ce..65308275 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -40,7 +40,7 @@ from datetime import datetime, timedelta
 from time import time
 from html import escape
 from io import StringIO
-from urllib.parse import urlencode, urlparse, urljoin, urlsplit
+from urllib.parse import urlencode, urljoin, urlparse
 
 from pygments import highlight
 from pygments.lexers import get_lexer_by_name
diff --git a/tests/unit/engines/test_command.py b/tests/unit/engines/test_command.py
index 0aa1c620..8f88b617 100644
--- a/tests/unit/engines/test_command.py
+++ b/tests/unit/engines/test_command.py
@@ -14,7 +14,6 @@ along with searx. If not, see < http://www.gnu.org/licenses/ >.
 
 '''
 
-from sys import version_info
 
 from searx.engines import command as command_engine
 from searx.testing import SearxTestCase
diff --git a/tests/unit/test_webadapter.py b/tests/unit/test_webadapter.py
index 7806353d..f620cf30 100644
--- a/tests/unit/test_webadapter.py
+++ b/tests/unit/test_webadapter.py
@@ -5,7 +5,7 @@ from searx.preferences import Preferences
 from searx.engines import engines
 
 import searx.search
-from searx.search import EngineRef, SearchQuery
+from searx.search import EngineRef
 from searx.webadapter import validate_engineref_list