diff --git a/searx/engines/__init__.py b/searx/engines/__init__.py
index 626372189..bc7b3b3bc 100644
--- a/searx/engines/__init__.py
+++ b/searx/engines/__init__.py
@@ -66,7 +66,7 @@ for engine_data in settings['engines']:
     for engine_attr in dir(engine):
         if engine_attr.startswith('_'):
             continue
-        if getattr(engine, engine_attr) == None:
+        if getattr(engine, engine_attr) is None:
             print '[E] Engine config error: Missing attribute "{0}.{1}"'.format(engine.name, engine_attr)  # noqa
             sys.exit(1)
     engines[engine.name] = engine
diff --git a/searx/engines/currency_convert.py b/searx/engines/currency_convert.py
index f08a01e00..ce6b3b854 100644
--- a/searx/engines/currency_convert.py
+++ b/searx/engines/currency_convert.py
@@ -5,7 +5,7 @@ categories = []
 url = 'http://finance.yahoo.com/d/quotes.csv?e=.csv&f=sl1d1t1&s={query}=X'
 weight = 100
 
-parser_re = re.compile(r'^\W*(\d+(?:\.\d+)?)\W*([a-z]{3})\W*(?:in)?\W*([a-z]{3})\W*$', re.I)
+parser_re = re.compile(r'^\W*(\d+(?:\.\d+)?)\W*([a-z]{3})\W*(?:in)?\W*([a-z]{3})\W*$', re.I)  # noqa
 
 
 def request(query, params):
@@ -46,9 +46,11 @@ def response(resp):
         resp.search_params['ammount'] * conversion_rate
     )
 
-    content = '1 {0} is {1} {2}'.format(resp.search_params['from'], conversion_rate, resp.search_params['to'])
+    content = '1 {0} is {1} {2}'.format(resp.search_params['from'],
+                                        conversion_rate,
+                                        resp.search_params['to'])
     now_date = datetime.now().strftime('%Y%m%d')
-    url = 'http://finance.yahoo.com/currency/converter-results/{0}/{1}-{2}-to-{3}.html'
+    url = 'http://finance.yahoo.com/currency/converter-results/{0}/{1}-{2}-to-{3}.html'  # noqa
     url = url.format(
         now_date,
         resp.search_params['ammount'],
diff --git a/searx/engines/dailymotion.py b/searx/engines/dailymotion.py
index 7e0c922a9..510dbbfae 100644
--- a/searx/engines/dailymotion.py
+++ b/searx/engines/dailymotion.py
@@ -6,7 +6,10 @@ categories = ['videos']
 locale = 'en_US'
 
 # see http://www.dailymotion.com/doc/api/obj-video.html
-search_url = 'https://api.dailymotion.com/videos?fields=title,description,duration,url,thumbnail_360_url&sort=relevance&limit=25&page=1&{query}'
+search_url = 'https://api.dailymotion.com/videos?fields=title,description,duration,url,thumbnail_360_url&sort=relevance&limit=25&page=1&{query}'  # noqa
+
+# TODO use video result template
+content_tpl = '<a href="{0}" title="{0}" ><img src="{1}" /></a><br />'
 
 
 def request(query, params):
@@ -25,7 +28,7 @@ def response(resp):
         title = res['title']
         url = res['url']
         if res['thumbnail_360_url']:
-            content = '<a href="{0}" title="{0}" ><img src="{1}" /></a><br />'.format(url, res['thumbnail_360_url'])
+            content = content_tpl.format(url, res['thumbnail_360_url'])
         else:
             content = ''
         if res['description']:
diff --git a/searx/engines/deviantart.py b/searx/engines/deviantart.py
index 9a4a8abde..94a94bf16 100644
--- a/searx/engines/deviantart.py
+++ b/searx/engines/deviantart.py
@@ -7,6 +7,7 @@ categories = ['images']
 base_url = 'https://www.deviantart.com/'
 search_url = base_url+'search?'
 
+
 def request(query, params):
     global search_url
     params['url'] = search_url + urlencode({'q': query})
@@ -22,8 +23,11 @@ def response(resp):
     for result in dom.xpath('//div[contains(@class, "tt-a tt-fh")]'):
         link = result.xpath('.//a[contains(@class, "thumb")]')[0]
         url = urljoin(base_url, link.attrib.get('href'))
-        title_links = result.xpath('.//span[@class="details"]//a[contains(@class, "t")]')
+        title_links = result.xpath('.//span[@class="details"]//a[contains(@class, "t")]')  # noqa
         title = ''.join(title_links[0].xpath('.//text()'))
         img_src = link.xpath('.//img')[0].attrib['src']
-        results.append({'url': url, 'title': title, 'img_src': img_src, 'template': 'images.html'})
+        results.append({'url': url,
+                        'title': title,
+                        'img_src': img_src,
+                        'template': 'images.html'})
     return results
diff --git a/searx/engines/duckduckgo.py b/searx/engines/duckduckgo.py
index 4bf770972..7cae87d95 100644
--- a/searx/engines/duckduckgo.py
+++ b/searx/engines/duckduckgo.py
@@ -6,8 +6,11 @@ url = 'https://duckduckgo.com/'
 search_url = url + 'd.js?{query}&p=1&s=0'
 locale = 'us-en'
 
+
 def request(query, params):
-    params['url'] = search_url.format(query=urlencode({'q': query, 'l': locale}))
+    q = urlencode({'q': query,
+                   'l': locale})
+    params['url'] = search_url.format(query=q)
     return params
 
 
@@ -17,8 +20,7 @@ def response(resp):
     for r in search_res:
         if not r.get('t'):
             continue
-        results.append({'title': r['t']
-                       ,'content': html_to_text(r['a'])
-                       ,'url': r['u']
-                       })
+        results.append({'title': r['t'],
+                       'content': html_to_text(r['a']),
+                       'url': r['u']})
     return results
diff --git a/searx/engines/duckduckgo_definitions.py b/searx/engines/duckduckgo_definitions.py
index 7b3950b85..3037aae53 100644
--- a/searx/engines/duckduckgo_definitions.py
+++ b/searx/engines/duckduckgo_definitions.py
@@ -3,8 +3,9 @@ from urllib import urlencode
 
 url = 'http://api.duckduckgo.com/?{query}&format=json&pretty=0&no_redirect=1'
 
+
 def request(query, params):
-    params['url'] =  url.format(query=urlencode({'q': query}))
+    params['url'] = url.format(query=urlencode({'q': query}))
     return params
 
 
@@ -13,11 +14,10 @@ def response(resp):
     results = []
     if 'Definition' in search_res:
         if search_res.get('AbstractURL'):
-            res = {'title'    : search_res.get('Heading', '')
-                  ,'content'  : search_res.get('Definition', '')
-                  ,'url'      : search_res.get('AbstractURL', '')
-                  ,'class'   : 'definition_result'
-                  }
+            res = {'title': search_res.get('Heading', ''),
+                   'content': search_res.get('Definition', ''),
+                   'url': search_res.get('AbstractURL', ''),
+                   'class': 'definition_result'}
             results.append(res)
 
     return results
diff --git a/searx/engines/filecrop.py b/searx/engines/filecrop.py
index 52426b84a..81340e601 100644
--- a/searx/engines/filecrop.py
+++ b/searx/engines/filecrop.py
@@ -2,7 +2,8 @@ from urllib import urlencode
 from HTMLParser import HTMLParser
 
 url = 'http://www.filecrop.com/'
-search_url = url + '/search.php?{query}&size_i=0&size_f=100000000&engine_r=1&engine_d=1&engine_e=1&engine_4=1&engine_m=1'
+search_url = url + '/search.php?{query}&size_i=0&size_f=100000000&engine_r=1&engine_d=1&engine_e=1&engine_4=1&engine_m=1'  # noqa
+
 
 class FilecropResultParser(HTMLParser):
     def __init__(self):
@@ -18,22 +19,28 @@ class FilecropResultParser(HTMLParser):
     def handle_starttag(self, tag, attrs):
 
         if tag == 'tr':
-            if ('bgcolor', '#edeff5') in attrs or ('bgcolor', '#ffffff') in attrs:
+            if ('bgcolor', '#edeff5') in attrs or\
+               ('bgcolor', '#ffffff') in attrs:
                 self.__start_processing = True
 
         if not self.__start_processing:
             return
 
         if tag == 'label':
-            self.result['title'] = [attr[1] for attr in attrs if attr[0] == 'title'][0]
-        elif tag == 'a' and ('rel', 'nofollow') in attrs and ('class', 'sourcelink') in attrs:
+            self.result['title'] = [attr[1] for attr in attrs
+                                    if attr[0] == 'title'][0]
+        elif tag == 'a' and ('rel', 'nofollow') in attrs\
+                and ('class', 'sourcelink') in attrs:
             if 'content' in self.result:
-                self.result['content'] += [attr[1] for attr in attrs if attr[0] == 'title'][0]
+                self.result['content'] += [attr[1] for attr in attrs
+                                           if attr[0] == 'title'][0]
             else:
-                self.result['content'] = [attr[1] for attr in attrs if attr[0] == 'title'][0]
+                self.result['content'] = [attr[1] for attr in attrs
+                                          if attr[0] == 'title'][0]
             self.result['content'] += ' '
         elif tag == 'a':
-            self.result['url'] = url + [attr[1] for attr in attrs if attr[0] == 'href'][0]
+            self.result['url'] = url + [attr[1] for attr in attrs
+                                        if attr[0] == 'href'][0]
 
     def handle_endtag(self, tag):
         if self.__start_processing is False:
@@ -60,10 +67,12 @@ class FilecropResultParser(HTMLParser):
 
         self.data_counter += 1
 
+
 def request(query, params):
-    params['url'] = search_url.format(query=urlencode({'w' :query}))
+    params['url'] = search_url.format(query=urlencode({'w': query}))
     return params
 
+
 def response(resp):
     parser = FilecropResultParser()
     parser.feed(resp.text)
diff --git a/searx/engines/flickr.py b/searx/engines/flickr.py
index a9832856d..d9554b99a 100644
--- a/searx/engines/flickr.py
+++ b/searx/engines/flickr.py
@@ -8,21 +8,27 @@ categories = ['images']
 
 url = 'https://secure.flickr.com/'
 search_url = url+'search/?{query}'
+results_xpath = '//div[@id="thumbnails"]//a[@class="rapidnofollow photo-click" and @data-track="photo-click"]'  # noqa
+
 
 def request(query, params):
     params['url'] = search_url.format(query=urlencode({'q': query}))
     return params
 
+
 def response(resp):
     global base_url
     results = []
     dom = html.fromstring(resp.text)
-    for result in dom.xpath('//div[@id="thumbnails"]//a[@class="rapidnofollow photo-click" and @data-track="photo-click"]'):
+    for result in dom.xpath(results_xpath):
         href = urljoin(url, result.attrib.get('href'))
         img = result.xpath('.//img')[0]
         title = img.attrib.get('alt', '')
         img_src = img.attrib.get('data-defer-src')
         if not img_src:
             continue
-        results.append({'url': href, 'title': title, 'img_src': img_src, 'template': 'images.html'})
+        results.append({'url': href,
+                        'title': title,
+                        'img_src': img_src,
+                        'template': 'images.html'})
     return results
diff --git a/searx/engines/github.py b/searx/engines/github.py
index b4baea6e8..be2cfe7c5 100644
--- a/searx/engines/github.py
+++ b/searx/engines/github.py
@@ -4,12 +4,15 @@ from cgi import escape
 
 categories = ['it']
 
-search_url = 'https://api.github.com/search/repositories?sort=stars&order=desc&{query}'
+search_url = 'https://api.github.com/search/repositories?sort=stars&order=desc&{query}'  # noqa
+
+accept_header = 'application/vnd.github.preview.text-match+json'
+
 
 def request(query, params):
     global search_url
     params['url'] = search_url.format(query=urlencode({'q': query}))
-    params['headers']['Accept'] = 'application/vnd.github.preview.text-match+json'
+    params['headers']['Accept'] = accept_header
     return params
 
 
diff --git a/searx/engines/google_images.py b/searx/engines/google_images.py
index d828a9c4b..57e749265 100644
--- a/searx/engines/google_images.py
+++ b/searx/engines/google_images.py
@@ -6,12 +6,14 @@ from json import loads
 categories = ['images']
 
 url = 'https://ajax.googleapis.com/'
-search_url = url + 'ajax/services/search/images?v=1.0&start=0&rsz=large&safe=off&filter=off&{query}'
+search_url = url + 'ajax/services/search/images?v=1.0&start=0&rsz=large&safe=off&filter=off&{query}'  # noqa
+
 
 def request(query, params):
     params['url'] = search_url.format(query=urlencode({'q': query}))
     return params
 
+
 def response(resp):
     results = []
     search_res = loads(resp.text)
@@ -24,5 +26,9 @@ def response(resp):
         title = result['title']
         if not result['url']:
             continue
-        results.append({'url': href, 'title': title, 'content': '', 'img_src': result['url'], 'template': 'images.html'})
+        results.append({'url': href,
+                        'title': title,
+                        'content': '',
+                        'img_src': result['url'],
+                        'template': 'images.html'})
     return results
diff --git a/searx/engines/json_engine.py b/searx/engines/json_engine.py
index 0386d53f7..e7cc808bb 100644
--- a/searx/engines/json_engine.py
+++ b/searx/engines/json_engine.py
@@ -2,12 +2,13 @@ from urllib import urlencode
 from json import loads
 from collections import Iterable
 
-search_url    = None
-url_query     = None
+search_url = None
+url_query = None
 content_query = None
-title_query   = None
+title_query = None
 #suggestion_xpath = ''
 
+
 def iterate(iterable):
     if type(iterable) == dict:
         it = iterable.iteritems()
@@ -17,11 +18,15 @@ def iterate(iterable):
     for index, value in it:
         yield str(index), value
 
+
 def is_iterable(obj):
-    if type(obj) == str: return False
-    if type(obj) == unicode: return False
+    if type(obj) == str:
+        return False
+    if type(obj) == unicode:
+        return False
     return isinstance(obj, Iterable)
 
+
 def parse(query):
     q = []
     for part in query.split('/'):
@@ -31,6 +36,7 @@ def parse(query):
             q.append(part)
     return q
 
+
 def do_query(data, q):
     ret = []
     if not len(q):
@@ -38,7 +44,7 @@ def do_query(data, q):
 
     qkey = q[0]
 
-    for key,value in iterate(data):
+    for key, value in iterate(data):
 
         if len(q) == 1:
             if key == qkey:
@@ -54,11 +60,13 @@ def do_query(data, q):
                 ret.extend(do_query(value, q))
     return ret
 
+
 def query(data, query_string):
     q = parse(query_string)
 
     return do_query(data, q)
 
+
 def request(query, params):
     query = urlencode({'q': query})[2:]
     params['url'] = search_url.format(query=query)
diff --git a/searx/engines/mediawiki.py b/searx/engines/mediawiki.py
index 00ad0f106..bc4aab6df 100644
--- a/searx/engines/mediawiki.py
+++ b/searx/engines/mediawiki.py
@@ -3,10 +3,12 @@ from urllib import urlencode, quote
 
 url = 'https://en.wikipedia.org/'
 
+search_url = url + 'w/api.php?action=query&list=search&{query}&srprop=timestamp&format=json'  # noqa
+
 number_of_results = 10
 
+
 def request(query, params):
-    search_url = url + 'w/api.php?action=query&list=search&{query}&srprop=timestamp&format=json'
     params['url'] = search_url.format(query=urlencode({'srsearch': query}))
     return params
 
@@ -14,7 +16,5 @@ def request(query, params):
 def response(resp):
     search_results = loads(resp.text)
     res = search_results.get('query', {}).get('search', [])
-
-    return [{'url': url + 'wiki/' + quote(result['title'].replace(' ', '_').encode('utf-8')),
+    return [{'url': url + 'wiki/' + quote(result['title'].replace(' ', '_').encode('utf-8')),  # noqa
         'title': result['title']} for result in res[:int(number_of_results)]]
-
diff --git a/searx/engines/piratebay.py b/searx/engines/piratebay.py
index 9cf410106..7319b49c1 100644
--- a/searx/engines/piratebay.py
+++ b/searx/engines/piratebay.py
@@ -7,13 +7,18 @@ categories = ['videos', 'music']
 
 url = 'https://thepiratebay.se/'
 search_url = url + 'search/{search_term}/0/99/{search_type}'
-search_types = {'videos': '200'
-               ,'music' : '100'
-               ,'files' : '0'
-               }
+search_types = {'videos': '200',
+                'music': '100',
+                'files': '0'}
+
+magnet_xpath = './/a[@title="Download this torrent using magnet"]'
+content_xpath = './/font[@class="detDesc"]//text()'
+
 
 def request(query, params):
-    params['url'] = search_url.format(search_term=quote(query), search_type=search_types.get(params['category']))
+    search_type = search_types.get(params['category'])
+    params['url'] = search_url.format(search_term=quote(query),
+                                      search_type=search_type)
     return params
 
 
@@ -27,10 +32,14 @@ def response(resp):
         link = result.xpath('.//div[@class="detName"]//a')[0]
         href = urljoin(url, link.attrib.get('href'))
         title = ' '.join(link.xpath('.//text()'))
-        content = escape(' '.join(result.xpath('.//font[@class="detDesc"]//text()')))
+        content = escape(' '.join(result.xpath(content_xpath)))
         seed, leech = result.xpath('.//td[@align="right"]/text()')[:2]
-        magnetlink = result.xpath('.//a[@title="Download this torrent using magnet"]')[0]
-        results.append({'url': href, 'title': title, 'content': content,
-                        'seed': seed, 'leech': leech, 'magnetlink': magnetlink.attrib['href'],
+        magnetlink = result.xpath(magnet_xpath)[0]
+        results.append({'url': href,
+                        'title': title,
+                        'content': content,
+                        'seed': seed,
+                        'leech': leech,
+                        'magnetlink': magnetlink.attrib['href'],
                         'template': 'torrent.html'})
     return results
diff --git a/searx/engines/soundcloud.py b/searx/engines/soundcloud.py
index 50414f153..b1930b2ee 100644
--- a/searx/engines/soundcloud.py
+++ b/searx/engines/soundcloud.py
@@ -5,7 +5,8 @@ categories = ['music']
 
 guest_client_id = 'b45b1aa10f1ac2941910a7f0d10f8e28'
 url = 'https://api.soundcloud.com/'
-search_url = url + 'search?{query}&facet=model&limit=20&offset=0&linked_partitioning=1&client_id='+guest_client_id
+search_url = url + 'search?{query}&facet=model&limit=20&offset=0&linked_partitioning=1&client_id='+guest_client_id  # noqa
+
 
 def request(query, params):
     global search_url
@@ -21,5 +22,7 @@ def response(resp):
         if result['kind'] in ('track', 'playlist'):
             title = result['title']
             content = result['description']
-            results.append({'url': result['permalink_url'], 'title': title, 'content': content})
+            results.append({'url': result['permalink_url'],
+                            'title': title,
+                            'content': content})
     return results
diff --git a/searx/engines/stackoverflow.py b/searx/engines/stackoverflow.py
index 9ee89bc6e..35230600f 100644
--- a/searx/engines/stackoverflow.py
+++ b/searx/engines/stackoverflow.py
@@ -7,6 +7,8 @@ categories = ['it']
 
 url = 'http://stackoverflow.com/'
 search_url = url+'search?'
+result_xpath = './/div[@class="excerpt"]//text()'
+
 
 def request(query, params):
     params['url'] = search_url + urlencode({'q': query})
@@ -20,6 +22,6 @@ def response(resp):
         link = result.xpath('.//div[@class="result-link"]//a')[0]
         href = urljoin(url, link.attrib.get('href'))
         title = escape(' '.join(link.xpath('.//text()')))
-        content = escape(' '.join(result.xpath('.//div[@class="excerpt"]//text()')))
+        content = escape(' '.join(result.xpath(result_xpath)))
         results.append({'url': href, 'title': title, 'content': content})
     return results
diff --git a/searx/engines/startpage.py b/searx/engines/startpage.py
index 87c091e2d..d6d7cf44d 100644
--- a/searx/engines/startpage.py
+++ b/searx/engines/startpage.py
@@ -1,11 +1,10 @@
 from urllib import urlencode
 from lxml import html
-from urlparse import urlparse
-from cgi import escape
 
 base_url = 'https://startpage.com/'
 search_url = base_url+'do/search'
 
+
 def request(query, params):
     global search_url
     query = urlencode({'q': query})[2:]
@@ -20,11 +19,10 @@ def response(resp):
     results = []
     dom = html.fromstring(resp.content)
     # ads xpath //div[@id="results"]/div[@id="sponsored"]//div[@class="result"]
-    # not ads : div[@class="result"] are the direct childs of div[@id="results"]
+    # not ads: div[@class="result"] are the direct childs of div[@id="results"]
     for result in dom.xpath('//div[@id="results"]/div[@class="result"]'):
         link = result.xpath('.//h3/a')[0]
         url = link.attrib.get('href')
-        parsed_url = urlparse(url)
         title = link.text_content()
         content = result.xpath('./p[@class="desc"]')[0].text_content()
         results.append({'url': url, 'title': title, 'content': content})
diff --git a/searx/engines/twitter.py b/searx/engines/twitter.py
index f9d9e26ad..23393ac4d 100644
--- a/searx/engines/twitter.py
+++ b/searx/engines/twitter.py
@@ -7,6 +7,9 @@ categories = ['social media']
 
 base_url = 'https://twitter.com/'
 search_url = base_url+'search?'
+title_xpath = './/span[@class="username js-action-profile-name"]//text()'
+content_xpath = './/p[@class="js-tweet-text tweet-text"]//text()'
+
 
 def request(query, params):
     global search_url
@@ -21,7 +24,9 @@ def response(resp):
     for tweet in dom.xpath('//li[@data-item-type="tweet"]'):
         link = tweet.xpath('.//small[@class="time"]//a')[0]
         url = urljoin(base_url, link.attrib.get('href'))
-        title = ''.join(tweet.xpath('.//span[@class="username js-action-profile-name"]//text()'))
-        content = escape(''.join(tweet.xpath('.//p[@class="js-tweet-text tweet-text"]//text()')))
-        results.append({'url': url, 'title': title, 'content': content})
+        title = ''.join(tweet.xpath(title_xpath))
+        content = escape(''.join(tweet.xpath(content_xpath)))
+        results.append({'url': url,
+                        'title': title,
+                        'content': content})
     return results
diff --git a/searx/engines/vimeo.py b/searx/engines/vimeo.py
index 35bc3d50a..924497a99 100644
--- a/searx/engines/vimeo.py
+++ b/searx/engines/vimeo.py
@@ -5,27 +5,31 @@ from lxml import html
 
 base_url = 'http://vimeo.com'
 search_url = base_url + '/search?{query}'
-url_xpath     = None
+url_xpath = None
 content_xpath = None
-title_xpath   = None
+title_xpath = None
 results_xpath = ''
+content_tpl = '<a href="{0}">  <img src="{2}"/> </a>'
 
-# the cookie set by vimeo contains all the following values, but only __utma seems to be requiered
+# the cookie set by vimeo contains all the following values,
+# but only __utma seems to be requiered
 cookie = {
     #'vuid':'918282893.1027205400'
     # 'ab_bs':'%7B%223%22%3A279%7D'
-     '__utma':'00000000.000#0000000.0000000000.0000000000.0000000000.0'
+     '__utma': '00000000.000#0000000.0000000000.0000000000.0000000000.0'
     # '__utmb':'18302654.1.10.1388942090'
     #, '__utmc':'18302654'
-    #, '__utmz':'18#302654.1388942090.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)'
+    #, '__utmz':'18#302654.1388942090.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)'  # noqa
     #, '__utml':'search'
 }
 
+
 def request(query, params):
-    params['url'] = search_url.format(query=urlencode({'q' :query}))
+    params['url'] = search_url.format(query=urlencode({'q': query}))
     params['cookies'] = cookie
     return params
 
+
 def response(resp):
     results = []
     dom = html.fromstring(resp.text)
@@ -36,10 +40,9 @@ def response(resp):
         url = base_url + result.xpath(url_xpath)[0]
         title = p.unescape(extract_text(result.xpath(title_xpath)))
         thumbnail = extract_text(result.xpath(content_xpath)[0])
-        content = '<a href="{0}">  <img src="{2}"/> </a>'.format(url, title, thumbnail)
-        results.append({'url': url
-                        , 'title': title
-                        , 'content': content 
-                        , 'template':'videos.html'
-                        , 'thumbnail': thumbnail})
+        results.append({'url': url,
+                        'title': title,
+                        'content': content_tpl.format(url, title, thumbnail),
+                        'template': 'videos.html',
+                        'thumbnail': thumbnail})
     return results
diff --git a/searx/engines/xpath.py b/searx/engines/xpath.py
index 5e2c3c38b..a7d24e2a2 100644
--- a/searx/engines/xpath.py
+++ b/searx/engines/xpath.py
@@ -1,21 +1,24 @@
 from lxml import html
 from urllib import urlencode, unquote
 from urlparse import urlparse, urljoin
-from cgi import escape
 from lxml.etree import _ElementStringResult
 
-search_url    = None
-url_xpath     = None
+search_url = None
+url_xpath = None
 content_xpath = None
-title_xpath   = None
+title_xpath = None
 suggestion_xpath = ''
 results_xpath = ''
 
+
 '''
 if xpath_results is list, extract the text from each result and concat the list
-if xpath_results is a xml element, extract all the text node from it ( text_content() method from lxml )
+if xpath_results is a xml element, extract all the text node from it
+   ( text_content() method from lxml )
 if xpath_results is a string element, then it's already done
 '''
+
+
 def extract_text(xpath_results):
     if type(xpath_results) == list:
         # it's list of result : concat everything using recursive call
@@ -60,7 +63,8 @@ def normalize_url(url):
         url += '/'
 
     # FIXME : hack for yahoo
-    if parsed_url.hostname == 'search.yahoo.com' and parsed_url.path.startswith('/r'):
+    if parsed_url.hostname == 'search.yahoo.com'\
+       and parsed_url.path.startswith('/r'):
         p = parsed_url.path
         mark = p.find('/**')
         if mark != -1:
@@ -82,15 +86,15 @@ def response(resp):
     if results_xpath:
         for result in dom.xpath(results_xpath):
             url = extract_url(result.xpath(url_xpath))
-            title = extract_text(result.xpath(title_xpath)[0 ])
+            title = extract_text(result.xpath(title_xpath)[0])
             content = extract_text(result.xpath(content_xpath)[0])
             results.append({'url': url, 'title': title, 'content': content})
     else:
         for url, title, content in zip(
-            map(extract_url, dom.xpath(url_xpath)), \
-            map(extract_text, dom.xpath(title_xpath)), \
-            map(extract_text, dom.xpath(content_xpath)), \
-                ):
+            map(extract_url, dom.xpath(url_xpath)),
+            map(extract_text, dom.xpath(title_xpath)),
+            map(extract_text, dom.xpath(content_xpath))
+        ):
             results.append({'url': url, 'title': title, 'content': content})
 
     if not suggestion_xpath:
diff --git a/searx/engines/yacy.py b/searx/engines/yacy.py
index c93ac522f..a4a41ac3b 100644
--- a/searx/engines/yacy.py
+++ b/searx/engines/yacy.py
@@ -4,10 +4,12 @@ from urllib import urlencode
 url = 'http://localhost:8090'
 search_url = '/yacysearch.json?{query}&maximumRecords=10'
 
+
 def request(query, params):
-    params['url'] = url + search_url.format(query=urlencode({'query':query}))
+    params['url'] = url + search_url.format(query=urlencode({'query': query}))
     return params
 
+
 def response(resp):
     raw_search_results = loads(resp.text)
 
@@ -25,7 +27,7 @@ def response(resp):
         tmp_result['content'] = ''
 
         if len(result['description']):
-            tmp_result['content'] += result['description'] +"<br/>"
+            tmp_result['content'] += result['description'] + "<br/>"
 
         if len(result['pubDate']):
             tmp_result['content'] += result['pubDate'] + "<br/>"
diff --git a/searx/engines/youtube.py b/searx/engines/youtube.py
index cefdb6536..62884702f 100644
--- a/searx/engines/youtube.py
+++ b/searx/engines/youtube.py
@@ -5,6 +5,7 @@ categories = ['videos']
 
 search_url = 'https://gdata.youtube.com/feeds/api/videos?alt=json&{query}'
 
+
 def request(query, params):
     params['url'] = search_url.format(query=urlencode({'q': query}))
     return params
@@ -30,17 +31,16 @@ def response(resp):
         thumbnail = ''
         if len(result['media$group']['media$thumbnail']):
             thumbnail = result['media$group']['media$thumbnail'][0]['url']
-            content += '<a href="{0}" title="{0}" ><img src="{1}" /></a>'.format(url, thumbnail)
+            content += '<a href="{0}" title="{0}" ><img src="{1}" /></a>'.format(url, thumbnail)  # noqa
         if len(content):
             content += '<br />' + result['content']['$t']
         else:
             content = result['content']['$t']
 
-        results.append({'url': url
-                        , 'title': title
-                        , 'content': content
-                        , 'template':'videos.html'
-                        , 'thumbnail':thumbnail})
+        results.append({'url': url,
+                        'title': title,
+                        'content': content,
+                        'template': 'videos.html',
+                        'thumbnail': thumbnail})
 
     return results
-
diff --git a/searx/utils.py b/searx/utils.py
index 4b8cb615c..af8ce952e 100644
--- a/searx/utils.py
+++ b/searx/utils.py
@@ -1,14 +1,15 @@
 from HTMLParser import HTMLParser
 #import htmlentitydefs
 import csv
-import codecs
+from codecs import getincrementalencoder
 import cStringIO
 import re
 
 
 def gen_useragent():
     # TODO
-    return "Mozilla/5.0 (X11; Linux x86_64; rv:26.0) Gecko/20100101 Firefox/26.0"
+    ua = "Mozilla/5.0 (X11; Linux x86_64; rv:26.0) Gecko/20100101 Firefox/26.0"
+    return ua
 
 
 def highlight_content(content, query):
@@ -46,7 +47,10 @@ class HTMLTextExtractor(HTMLParser):
         self.result.append(d)
 
     def handle_charref(self, number):
-        codepoint = int(number[1:], 16) if number[0] in (u'x', u'X') else int(number)
+        if number[0] in (u'x', u'X'):
+            codepoint = int(number[1:], 16)
+        else:
+            codepoint = int(number)
         self.result.append(unichr(codepoint))
 
     def handle_entityref(self, name):
@@ -75,10 +79,16 @@ class UnicodeWriter:
         self.queue = cStringIO.StringIO()
         self.writer = csv.writer(self.queue, dialect=dialect, **kwds)
         self.stream = f
-        self.encoder = codecs.getincrementalencoder(encoding)()
+        self.encoder = getincrementalencoder(encoding)()
 
     def writerow(self, row):
-        self.writer.writerow([(s.encode("utf-8").strip() if type(s) == str or type(s) == unicode else str(s)) for s in row])
+        unicode_row = []
+        for col in row:
+            if type(col) == str or type(col) == unicode:
+                unicode_row.append(col.encode('utf-8').strip())
+            else:
+                unicode_row.append(col)
+        self.writer.writerow(unicode_row)
         # Fetch UTF-8 output from the queue ...
         data = self.queue.getvalue()
         data = data.decode("utf-8")
diff --git a/searx/webapp.py b/searx/webapp.py
index a8902f635..9cefb3712 100644
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -18,7 +18,8 @@ along with searx. If not, see < http://www.gnu.org/licenses/ >.
 '''
 
 from searx import settings
-from flask import Flask, request, render_template, url_for, Response, make_response, redirect
+from flask import Flask, request, render_template
+from flask import url_for, Response, make_response, redirect
 from searx.engines import search, categories, engines, get_engines_stats
 import json
 import cStringIO
@@ -70,7 +71,8 @@ def get_base_url():
 def render(template_name, **kwargs):
     global categories
     kwargs['categories'] = ['general']
-    kwargs['categories'].extend(x for x in sorted(categories.keys()) if x != 'general')
+    kwargs['categories'].extend(x for x in
+                                sorted(categories.keys()) if x != 'general')
     if not 'selected_categories' in kwargs:
         kwargs['selected_categories'] = []
         cookie_categories = request.cookies.get('categories', '').split(',')
@@ -114,7 +116,8 @@ def index():
                     continue
                 selected_categories.append(category)
         if not len(selected_categories):
-            cookie_categories = request.cookies.get('categories', '').split(',')
+            cookie_categories = request.cookies.get('categories', '')
+            cookie_categories = cookie_categories.split(',')
             for ccateg in cookie_categories:
                 if ccateg in categories:
                     selected_categories.append(ccateg)
@@ -122,7 +125,9 @@ def index():
             selected_categories = ['general']
 
         for categ in selected_categories:
-            selected_engines.extend({'category': categ, 'name': x.name} for x in categories[categ])
+            selected_engines.extend({'category': categ,
+                                     'name': x.name}
+                                    for x in categories[categ])
 
     results, suggestions = search(query, request, selected_engines)
 
@@ -137,7 +142,8 @@ def index():
                 result['content'] = html_to_text(result['content']).strip()
             result['title'] = html_to_text(result['title']).strip()
         if len(result['url']) > 74:
-            result['pretty_url'] = result['url'][:35] + '[..]' + result['url'][-35:]
+            url_parts = result['url'][:35], result['url'][-35:]
+            result['pretty_url'] = '{0}[...]{1}'.format(*url_parts)
         else:
             result['pretty_url'] = result['url']
 
@@ -146,7 +152,8 @@ def index():
                 result['favicon'] = engine
 
     if request_data.get('format') == 'json':
-        return Response(json.dumps({'query': query, 'results': results}), mimetype='application/json')
+        return Response(json.dumps({'query': query, 'results': results}),
+                        mimetype='application/json')
     elif request_data.get('format') == 'csv':
         csv = UnicodeWriter(cStringIO.StringIO())
         keys = ('title', 'url', 'content', 'host', 'engine', 'score')
@@ -157,7 +164,8 @@ def index():
                 csv.writerow([row.get(key, '') for key in keys])
         csv.stream.seek(0)
         response = Response(csv.stream.read(), mimetype='application/csv')
-        response.headers.add('Content-Disposition', 'attachment;Filename=searx_-_{0}.csv'.format('_'.join(query.split())))
+        content_disp = 'attachment;Filename=searx_-_{0}.csv'.format(query)
+        response.headers.add('Content-Disposition', content_disp)
         return response
     elif request_data.get('format') == 'rss':
         response_rss = render(
@@ -240,15 +248,16 @@ def opensearch():
     base_url = get_base_url()
     ret = opensearch_xml.format(method=method, host=base_url)
     resp = Response(response=ret,
-                status=200,
-                mimetype="application/xml")
+                    status=200,
+                    mimetype="application/xml")
     return resp
 
 
 @app.route('/favicon.ico')
 def favicon():
     return send_from_directory(os.path.join(app.root_path, 'static/img'),
-                               'favicon.png', mimetype='image/vnd.microsoft.icon')
+                               'favicon.png',
+                               mimetype='image/vnd.microsoft.icon')
 
 
 def run():