diff --git a/searx/engines/bing.py b/searx/engines/bing.py
index 56c6b36c..5de461cf 100644
--- a/searx/engines/bing.py
+++ b/searx/engines/bing.py
@@ -1,8 +1,9 @@
 ## Bing (Web)
-# 
+#
 # @website     https://www.bing.com
-# @provide-api yes (http://datamarket.azure.com/dataset/bing/search), max. 5000 query/month
-# 
+# @provide-api yes (http://datamarket.azure.com/dataset/bing/search),
+#              max. 5000 query/month
+#
 # @using-api   no (because of query limit)
 # @results     HTML (using search portal)
 # @stable      no (HTML can change)
@@ -58,8 +59,8 @@ def response(resp):
         content = escape(' '.join(result.xpath('.//p//text()')))
 
         # append result
-        results.append({'url': url, 
-                        'title': title, 
+        results.append({'url': url,
+                        'title': title,
                         'content': content})
 
     # return results if something is found
@@ -74,8 +75,8 @@ def response(resp):
         content = escape(' '.join(result.xpath('.//p//text()')))
 
         # append result
-        results.append({'url': url, 
-                        'title': title, 
+        results.append({'url': url,
+                        'title': title,
                         'content': content})
 
     # return results
diff --git a/searx/engines/bing_images.py b/searx/engines/bing_images.py
index b3eabba4..6c5e49bc 100644
--- a/searx/engines/bing_images.py
+++ b/searx/engines/bing_images.py
@@ -1,17 +1,19 @@
 ## Bing (Images)
-# 
+#
 # @website     https://www.bing.com/images
-# @provide-api yes (http://datamarket.azure.com/dataset/bing/search), max. 5000 query/month
-# 
+# @provide-api yes (http://datamarket.azure.com/dataset/bing/search),
+#              max. 5000 query/month
+#
 # @using-api   no (because of query limit)
 # @results     HTML (using search portal)
 # @stable      no (HTML can change)
 # @parse       url, title, img_src
 #
-# @todo        currently there are up to 35 images receive per page, because bing does not parse count=10. limited response to 10 images
+# @todo        currently there are up to 35 images receive per page,
+#              because bing does not parse count=10.
+#              limited response to 10 images
 
 from urllib import urlencode
-from cgi import escape
 from lxml import html
 from yaml import load
 import re
@@ -51,15 +53,15 @@ def response(resp):
     dom = html.fromstring(resp.content)
 
     # init regex for yaml-parsing
-    p = re.compile( '({|,)([a-z]+):(")')
+    p = re.compile('({|,)([a-z]+):(")')
 
     # parse results
     for result in dom.xpath('//div[@class="dg_u"]'):
         link = result.xpath('./a')[0]
 
         # parse yaml-data (it is required to add a space, to make it parsable)
-        yaml_data = load(p.sub( r'\1\2: \3', link.attrib.get('m')))
- 
+        yaml_data = load(p.sub(r'\1\2: \3', link.attrib.get('m')))
+
         title = link.attrib.get('t1')
         #url = 'http://' + link.attrib.get('t3')
         url = yaml_data.get('surl')
@@ -69,7 +71,7 @@ def response(resp):
         results.append({'template': 'images.html',
                         'url': url,
                         'title': title,
-                        'content': '',  
+                        'content': '',
                         'img_src': img_src})
 
         # TODO stop parsing if 10 images are found
diff --git a/searx/engines/bing_news.py b/searx/engines/bing_news.py
index 279f0d69..5dce4a2b 100644
--- a/searx/engines/bing_news.py
+++ b/searx/engines/bing_news.py
@@ -1,8 +1,9 @@
 ## Bing (News)
-# 
+#
 # @website     https://www.bing.com/news
-# @provide-api yes (http://datamarket.azure.com/dataset/bing/search), max. 5000 query/month
-# 
+# @provide-api yes (http://datamarket.azure.com/dataset/bing/search),
+#              max. 5000 query/month
+#
 # @using-api   no (because of query limit)
 # @results     HTML (using search portal)
 # @stable      no (HTML can change)
@@ -57,12 +58,12 @@ def response(resp):
         url = link.attrib.get('href')
         title = ' '.join(link.xpath('.//text()'))
         contentXPath = result.xpath('.//div[@class="sn_txt"]/div//span[@class="sn_snip"]//text()')
-        if contentXPath != None:
+        if contentXPath is not None:
             content = escape(' '.join(contentXPath))
-            
+
         # parse publishedDate
         publishedDateXPath = result.xpath('.//div[@class="sn_txt"]/div//span[contains(@class,"sn_ST")]//span[contains(@class,"sn_tm")]//text()')
-        if publishedDateXPath != None:
+        if publishedDateXPath is not None:
             publishedDate = escape(' '.join(publishedDateXPath))
 
         if re.match("^[0-9]+ minute(s|) ago$", publishedDate):
@@ -89,10 +90,10 @@ def response(resp):
             except TypeError:
                 # FIXME
                 publishedDate = datetime.now()
-                
+
         # append result
-        results.append({'url': url, 
-                        'title': title, 
+        results.append({'url': url,
+                        'title': title,
                         'publishedDate': publishedDate,
                         'content': content})
 
diff --git a/searx/engines/currency_convert.py b/searx/engines/currency_convert.py
index b5f0953d..d8841c1d 100644
--- a/searx/engines/currency_convert.py
+++ b/searx/engines/currency_convert.py
@@ -55,6 +55,6 @@ def response(resp):
         resp.search_params['to'].lower()
     )
 
-    results.append({'answer' : answer, 'url': url})
+    results.append({'answer': answer, 'url': url})
 
     return results
diff --git a/searx/engines/dailymotion.py b/searx/engines/dailymotion.py
index 75c2e507..a5bffa86 100644
--- a/searx/engines/dailymotion.py
+++ b/searx/engines/dailymotion.py
@@ -1,8 +1,8 @@
 ## Dailymotion (Videos)
-# 
+#
 # @website     https://www.dailymotion.com
 # @provide-api yes (http://www.dailymotion.com/developer)
-# 
+#
 # @using-api   yes
 # @results     JSON
 # @stable      yes
@@ -12,7 +12,6 @@
 
 from urllib import urlencode
 from json import loads
-from lxml import html
 
 # engine dependent config
 categories = ['videos']
diff --git a/searx/engines/deviantart.py b/searx/engines/deviantart.py
index ff5e1d46..d436e816 100644
--- a/searx/engines/deviantart.py
+++ b/searx/engines/deviantart.py
@@ -1,8 +1,8 @@
 ## Deviantart (Images)
-# 
+#
 # @website     https://www.deviantart.com/
 # @provide-api yes (https://www.deviantart.com/developers/) (RSS)
-# 
+#
 # @using-api   no (TODO, rewrite to api)
 # @results     HTML
 # @stable      no (HTML can change)
diff --git a/searx/engines/duckduckgo.py b/searx/engines/duckduckgo.py
index 296dd9b2..583e33f7 100644
--- a/searx/engines/duckduckgo.py
+++ b/searx/engines/duckduckgo.py
@@ -1,15 +1,17 @@
 ## DuckDuckGo (Web)
-# 
+#
 # @website     https://duckduckgo.com/
-# @provide-api yes (https://duckduckgo.com/api), but not all results from search-site
-# 
+# @provide-api yes (https://duckduckgo.com/api),
+#              but not all results from search-site
+#
 # @using-api   no
 # @results     HTML (using search portal)
 # @stable      no (HTML can change)
 # @parse       url, title, content
 #
 # @todo        rewrite to api
-# @todo        language support (the current used site does not support language-change)
+# @todo        language support
+#              (the current used site does not support language-change)
 
 from urllib import urlencode
 from lxml.html import fromstring
@@ -37,7 +39,7 @@ def request(query, params):
     if params['language'] == 'all':
         locale = 'en-us'
     else:
-        locale = params['language'].replace('_','-').lower()
+        locale = params['language'].replace('_', '-').lower()
 
     params['url'] = url.format(
         query=urlencode({'q': query, 'kl': locale}),
diff --git a/searx/engines/dummy.py b/searx/engines/dummy.py
index 5a2cdf6b..c60b7a5d 100644
--- a/searx/engines/dummy.py
+++ b/searx/engines/dummy.py
@@ -1,5 +1,5 @@
 ## Dummy
-# 
+#
 # @results     empty array
 # @stable      yes
 
diff --git a/searx/engines/faroo.py b/searx/engines/faroo.py
index 8c69c5be..dada4758 100644
--- a/searx/engines/faroo.py
+++ b/searx/engines/faroo.py
@@ -1,8 +1,8 @@
 ## Faroo (Web, News)
-# 
+#
 # @website     http://www.faroo.com
 # @provide-api yes (http://www.faroo.com/hp/api/api.html), require API-key
-# 
+#
 # @using-api   yes
 # @results     JSON
 # @stable      yes
@@ -24,9 +24,10 @@ api_key = None
 url = 'http://www.faroo.com/'
 search_url = url + 'api?{query}&start={offset}&length={number_of_results}&l={language}&src={categorie}&i=false&f=json&key={api_key}'
 
-search_category = {'general': 'web',                
+search_category = {'general': 'web',
                 'news': 'news'}
 
+
 # do search-request
 def request(query, params):
     offset = (params['pageno']-1) * number_of_results + 1
@@ -48,7 +49,7 @@ def request(query, params):
                                       query=urlencode({'q': query}),
                                       language=language,
                                       categorie=categorie,
-                                      api_key=api_key )
+                                      api_key=api_key)
 
     # using searx User-Agent
     params['headers']['User-Agent'] = searx_useragent()
@@ -101,7 +102,7 @@ def response(resp):
             results.append({'template': 'images.html',
                             'url': result['url'],
                             'title': result['title'],
-                            'content': result['kwic'],  
+                            'content': result['kwic'],
                             'img_src': result['iurl']})
 
     # return results
diff --git a/searx/engines/generalfile.py b/searx/engines/generalfile.py
index 11d8b695..b7d71629 100644
--- a/searx/engines/generalfile.py
+++ b/searx/engines/generalfile.py
@@ -1,8 +1,8 @@
 ## General Files (Files)
-# 
+#
 # @website     http://www.general-files.org
 # @provide-api no (nothing found)
-# 
+#
 # @using-api   no (because nothing found)
 # @results     HTML (using search portal)
 # @stable      no (HTML can change)
diff --git a/searx/engines/github.py b/searx/engines/github.py
index 53fec029..a68aed14 100644
--- a/searx/engines/github.py
+++ b/searx/engines/github.py
@@ -1,8 +1,8 @@
 ## Github (It)
-# 
+#
 # @website     https://github.com/
 # @provide-api yes (https://developer.github.com/v3/)
-# 
+#
 # @using-api   yes
 # @results     JSON
 # @stable      yes (using api)
diff --git a/searx/engines/google_images.py b/searx/engines/google_images.py
index 6c99f280..7b8b15b4 100644
--- a/searx/engines/google_images.py
+++ b/searx/engines/google_images.py
@@ -1,8 +1,9 @@
 ## Google (Images)
-# 
+#
 # @website     https://www.google.com
-# @provide-api yes (https://developers.google.com/web-search/docs/), deprecated!
-# 
+# @provide-api yes (https://developers.google.com/web-search/docs/),
+#              deprecated!
+#
 # @using-api   yes
 # @results     JSON
 # @stable      yes (but deprecated)
diff --git a/searx/engines/google_news.py b/searx/engines/google_news.py
index becc7e21..eb114f9c 100644
--- a/searx/engines/google_news.py
+++ b/searx/engines/google_news.py
@@ -1,8 +1,9 @@
 ## Google (News)
-# 
+#
 # @website     https://www.google.com
-# @provide-api yes (https://developers.google.com/web-search/docs/), deprecated!
-# 
+# @provide-api yes (https://developers.google.com/web-search/docs/),
+#              deprecated!
+#
 # @using-api   yes
 # @results     JSON
 # @stable      yes (but deprecated)
diff --git a/searx/engines/openstreetmap.py b/searx/engines/openstreetmap.py
index f727ca8e..36b6011e 100644
--- a/searx/engines/openstreetmap.py
+++ b/searx/engines/openstreetmap.py
@@ -39,16 +39,16 @@ def response(resp):
         url = result_base_url.format(osm_type=osm_type,
                                      osm_id=r['osm_id'])
 
-        osm = {'type':osm_type,
-               'id':r['osm_id']}
+        osm = {'type': osm_type,
+               'id': r['osm_id']}
 
-        geojson =  r.get('geojson')
+        geojson = r.get('geojson')
 
         # if no geojson is found and osm_type is a node, add geojson Point
         if not geojson and\
            osm_type == 'node':
-            geojson = {u'type':u'Point', 
-                       u'coordinates':[r['lon'],r['lat']]}
+            geojson = {u'type': u'Point',
+                       u'coordinates': [r['lon'], r['lat']]}
 
         address_raw = r.get('address')
         address = {}
@@ -59,20 +59,20 @@ def response(resp):
            r['class'] == 'tourism' or\
            r['class'] == 'leisure':
             if address_raw.get('address29'):
-                address = {'name':address_raw.get('address29')}
+                address = {'name': address_raw.get('address29')}
             else:
-                address = {'name':address_raw.get(r['type'])}
+                address = {'name': address_raw.get(r['type'])}
 
         # add rest of adressdata, if something is already found
         if address.get('name'):
-            address.update({'house_number':address_raw.get('house_number'),
-                       'road':address_raw.get('road'),
-                       'locality':address_raw.get('city',
-                                  address_raw.get('town', 
-                                  address_raw.get('village'))),
-                       'postcode':address_raw.get('postcode'),
-                       'country':address_raw.get('country'),
-                       'country_code':address_raw.get('country_code')})
+            address.update({'house_number': address_raw.get('house_number'),
+                           'road': address_raw.get('road'),
+                           'locality': address_raw.get('city',
+                                       address_raw.get('town',
+                                       address_raw.get('village'))),
+                           'postcode': address_raw.get('postcode'),
+                           'country': address_raw.get('country'),
+                           'country_code': address_raw.get('country_code')})
         else:
             address = None
 
diff --git a/searx/engines/piratebay.py b/searx/engines/piratebay.py
index 9533b629..14905dc8 100644
--- a/searx/engines/piratebay.py
+++ b/searx/engines/piratebay.py
@@ -1,8 +1,8 @@
 ## Piratebay (Videos, Music, Files)
-# 
+#
 # @website     https://thepiratebay.se
 # @provide-api no (nothing found)
-# 
+#
 # @using-api   no
 # @results     HTML (using search portal)
 # @stable      yes (HTML can change)
@@ -23,7 +23,7 @@ url = 'https://thepiratebay.se/'
 search_url = url + 'search/{search_term}/{pageno}/99/{search_type}'
 
 # piratebay specific type-definitions
-search_types = {'files': '0',                
+search_types = {'files': '0',
                 'music': '100',
                 'videos': '200'}
 
diff --git a/searx/engines/soundcloud.py b/searx/engines/soundcloud.py
index aebea239..390e7ca1 100644
--- a/searx/engines/soundcloud.py
+++ b/searx/engines/soundcloud.py
@@ -1,8 +1,8 @@
 ## Soundcloud (Music)
-# 
+#
 # @website     https://soundcloud.com
 # @provide-api yes (https://developers.soundcloud.com/)
-# 
+#
 # @using-api   yes
 # @results     JSON
 # @stable      yes
diff --git a/searx/engines/stackoverflow.py b/searx/engines/stackoverflow.py
index edbe74a7..dcbb1890 100644
--- a/searx/engines/stackoverflow.py
+++ b/searx/engines/stackoverflow.py
@@ -1,8 +1,8 @@
 ## Stackoverflow (It)
-# 
+#
 # @website     https://stackoverflow.com/
 # @provide-api not clear (https://api.stackexchange.com/docs/advanced-search)
-# 
+#
 # @using-api   no
 # @results     HTML
 # @stable      no (HTML can change)
@@ -50,8 +50,8 @@ def response(resp):
         content = escape(' '.join(result.xpath(content_xpath)))
 
         # append result
-        results.append({'url': href, 
-                        'title': title, 
+        results.append({'url': href,
+                        'title': title,
                         'content': content})
 
     # return results
diff --git a/searx/engines/twitter.py b/searx/engines/twitter.py
index 8de78144..0689150c 100644
--- a/searx/engines/twitter.py
+++ b/searx/engines/twitter.py
@@ -1,8 +1,8 @@
 ## Twitter (Social media)
-# 
+#
 # @website     https://www.bing.com/news
 # @provide-api yes (https://dev.twitter.com/docs/using-search)
-# 
+#
 # @using-api   no
 # @results     HTML (using search portal)
 # @stable      no (HTML can change)
diff --git a/searx/engines/vimeo.py b/searx/engines/vimeo.py
index 2a91e76f..c66c4148 100644
--- a/searx/engines/vimeo.py
+++ b/searx/engines/vimeo.py
@@ -1,8 +1,9 @@
 ## Vimeo (Videos)
-# 
+#
 # @website     https://vimeo.com/
-# @provide-api yes (http://developer.vimeo.com/api), they have a maximum count of queries/hour
-# 
+# @provide-api yes (http://developer.vimeo.com/api),
+#              they have a maximum count of queries/hour
+#
 # @using-api   no (TODO, rewrite to api)
 # @results     HTML (using search portal)
 # @stable      no (HTML can change)
@@ -35,11 +36,12 @@ publishedDate_xpath = './/p[@class="meta"]//attribute::datetime'
 
 # do search-request
 def request(query, params):
-    params['url'] = search_url.format(pageno=params['pageno'] ,
+    params['url'] = search_url.format(pageno=params['pageno'],
                                       query=urlencode({'q': query}))
 
     # TODO required?
-    params['cookies']['__utma'] = '00000000.000#0000000.0000000000.0000000000.0000000000.0'
+    params['cookies']['__utma'] =\
+        '00000000.000#0000000.0000000000.0000000000.0000000000.0'
 
     return params
 
diff --git a/searx/engines/yacy.py b/searx/engines/yacy.py
index 2345b24f..3ee0e91c 100644
--- a/searx/engines/yacy.py
+++ b/searx/engines/yacy.py
@@ -1,8 +1,9 @@
 ## Yacy (Web, Images, Videos, Music, Files)
-# 
+#
 # @website     http://yacy.net
-# @provide-api yes (http://www.yacy-websuche.de/wiki/index.php/Dev:APIyacysearch)
-# 
+# @provide-api yes
+#              (http://www.yacy-websuche.de/wiki/index.php/Dev:APIyacysearch)
+#
 # @using-api   yes
 # @results     JSON
 # @stable      yes
@@ -16,7 +17,7 @@ from urllib import urlencode
 from dateutil import parser
 
 # engine dependent config
-categories = ['general', 'images'] #TODO , 'music', 'videos', 'files'
+categories = ['general', 'images']  # TODO , 'music', 'videos', 'files'
 paging = True
 language_support = True
 number_of_results = 5
@@ -28,7 +29,7 @@ search_url = '/yacysearch.json?{query}&startRecord={offset}&maximumRecords={limi
 # yacy specific type-definitions
 search_types = {'general': 'text',
                 'images': 'image',
-                'files': 'app',               
+                'files': 'app',
                 'music': 'audio',
                 'videos': 'video'}
 
diff --git a/searx/engines/yahoo.py b/searx/engines/yahoo.py
index 5e34a2b0..938540ec 100644
--- a/searx/engines/yahoo.py
+++ b/searx/engines/yahoo.py
@@ -1,8 +1,9 @@
 ## Yahoo (Web)
-# 
+#
 # @website     https://search.yahoo.com/web
-# @provide-api yes (https://developer.yahoo.com/boss/search/), $0.80/1000 queries
-# 
+# @provide-api yes (https://developer.yahoo.com/boss/search/),
+#              $0.80/1000 queries
+#
 # @using-api   no (because pricing)
 # @results     HTML (using search portal)
 # @stable      no (HTML can change)
@@ -40,8 +41,8 @@ def parse_url(url_string):
         if endpos > -1:
             endpositions.append(endpos)
 
-    if start==0 or len(endpositions) == 0:
-        return url_string        
+    if start == 0 or len(endpositions) == 0:
+        return url_string
     else:
         end = min(endpositions)
         return unquote(url_string[start:end])
@@ -84,8 +85,8 @@ def response(resp):
         content = extract_text(result.xpath(content_xpath)[0])
 
         # append result
-        results.append({'url': url, 
-                        'title': title, 
+        results.append({'url': url,
+                        'title': title,
                         'content': content})
 
     # if no suggestion found, return results
diff --git a/searx/engines/youtube.py b/searx/engines/youtube.py
index 7d1c207f..973e799f 100644
--- a/searx/engines/youtube.py
+++ b/searx/engines/youtube.py
@@ -1,8 +1,8 @@
 ## Youtube (Videos)
-# 
+#
 # @website     https://www.youtube.com/
 # @provide-api yes (http://gdata-samples-youtube-search-py.appspot.com/)
-# 
+#
 # @using-api   yes
 # @results     JSON
 # @stable      yes