diff --git a/searx/engines/wikipedia.py b/searx/engines/wikipedia.py
index cc806a8de..e93111cdf 100644
--- a/searx/engines/wikipedia.py
+++ b/searx/engines/wikipedia.py
@@ -25,74 +25,74 @@ supported_languages_url = 'https://meta.wikimedia.org/wiki/List_of_Wikipedias'
 language_variants = {"zh": ("zh-cn", "zh-hk", "zh-mo", "zh-my", "zh-sg", "zh-tw")}
 
 
-# set language in base_url
-def url_lang(lang):
-    lang_pre = lang.split('-')[0]
-    if lang_pre == 'all' or lang_pre not in supported_languages and lang_pre not in language_aliases:
-        return 'en'
-    return match_language(lang, supported_languages, language_aliases).split('-')[0]
+    # set language in base_url
+    def url_lang(lang):
+        lang_pre = lang.split('-')[0]
+        if lang_pre == 'all' or lang_pre not in supported_languages and lang_pre not in language_aliases:
+            return 'en'
+        return match_language(lang, supported_languages, language_aliases).split('-')[0]
 
 
-# do search-request
-def request(query, params):
-    if query.islower():
-        query = query.title()
+    # do search-request
+    def request(query, params):
+        if query.islower():
+            query = query.title()
 
-    language = url_lang(params['language'])
-    params['url'] = search_url.format(title=quote(query), language=language)
+        language = url_lang(params['language'])
+        params['url'] = search_url.format(title=quote(query), language=language)
 
-    if params['language'].lower() in language_variants.get(language, []):
-        params['headers']['Accept-Language'] = params['language'].lower()
+        if params['language'].lower() in language_variants.get(language, []):
+            params['headers']['Accept-Language'] = params['language'].lower()
 
-    params['headers']['User-Agent'] = searx_useragent()
-    params['raise_for_httperror'] = False
-    params['soft_max_redirects'] = 2
+        params['headers']['User-Agent'] = searx_useragent()
+        params['raise_for_httperror'] = False
+        params['soft_max_redirects'] = 2
 
-    return params
+        return params
 
 
-# get response from search-request
-def response(resp):
-    if resp.status_code == 404:
-        return []
+    # get response from search-request
+    def response(resp):
+        if resp.status_code == 404:
+            return []
 
-    if resp.status_code == 400:
-        try:
-            api_result = loads(resp.text)
-        except:
-            pass
-        else:
-            if (
-                api_result['type'] == 'https://mediawiki.org/wiki/HyperSwitch/errors/bad_request'
-                and api_result['detail'] == 'title-invalid-characters'
-            ):
-                return []
+        if resp.status_code == 400:
+            try:
+                api_result = loads(resp.text)
+            except:
+                pass
+            else:
+                if (
+                    api_result['type'] == 'https://mediawiki.org/wiki/HyperSwitch/errors/bad_request'
+                    and api_result['detail'] == 'title-invalid-characters'
+                ):
+                    return []
 
-    raise_for_httperror(resp)
+        raise_for_httperror(resp)
 
-    results = []
-    api_result = loads(resp.text)
+        results = []
+        api_result = loads(resp.text)
 
-    # skip disambiguation pages
-    if api_result.get('type') != 'standard':
-        return []
+        # skip disambiguation pages
+        if api_result.get('type') != 'standard':
+            return []
 
-    title = api_result['title']
-    wikipedia_link = api_result['content_urls']['desktop']['page']
+        title = api_result['title']
+        wikipedia_link = api_result['content_urls']['desktop']['page']
 
-    results.append({'url': wikipedia_link, 'title': title})
+        results.append({'url': wikipedia_link, 'title': title})
 
-    results.append(
-        {
-            'infobox': title,
-            'id': wikipedia_link,
-            'content': api_result.get('extract', ''),
-            'img_src': api_result.get('thumbnail', {}).get('source'),
-            'urls': [{'title': 'Wikipedia', 'url': wikipedia_link}],
-        }
-    )
+        results.append(
+            {
+                'infobox': title,
+                'id': wikipedia_link,
+                'content': api_result.get('extract', ''),
+                'img_src': api_result.get('thumbnail', {}).get('source'),
+                'urls': [{'title': 'Wikipedia', 'url': wikipedia_link}],
+            }
+        )
 
-    return results
+        return results
 
 
 # get supported languages from their site