diff --git a/searx/engines/duckduckgo.py b/searx/engines/duckduckgo.py
index 4c93380f..e77ef012 100644
--- a/searx/engines/duckduckgo.py
+++ b/searx/engines/duckduckgo.py
@@ -106,7 +106,7 @@ def response(resp):
     doc = fromstring(resp.text)
 
     # parse results
-    for i,r in enumerate(doc.xpath(result_xpath)):
+    for i, r in enumerate(doc.xpath(result_xpath)):
         if i >= 30:
             break
         try:
diff --git a/searx/engines/startpage.py b/searx/engines/startpage.py
index 868b964f..0f0ec6e1 100644
--- a/searx/engines/startpage.py
+++ b/searx/engines/startpage.py
@@ -51,7 +51,6 @@ def request(query, params):
         'engine0': 'v1all',
     }
 
-
     # set language if specified
     if params['language'] != 'all':
         language = 'english'
diff --git a/searx/plugins/tracker_url_remover.py b/searx/plugins/tracker_url_remover.py
index a1ed0d05..8cc063bb 100644
--- a/searx/plugins/tracker_url_remover.py
+++ b/searx/plugins/tracker_url_remover.py
@@ -37,7 +37,7 @@ def on_result(request, search, result):
     parsed_query = parse_qsl(query)
 
     changed = False
-    for i,(param_name,_) in enumerate(list(parsed_query)):
+    for i, (param_name, _) in enumerate(list(parsed_query)):
         for reg in regexes:
             if reg.match(param_name):
                 parsed_query.pop(i)