update soundcloud and add comments

searx/engines/soundcloud.py

+## Soundcloud (Music)
+# 
+# @website     https://soundcloud.com
+# @provide-api yes (https://developers.soundcloud.com/)
+# 
+# @using-api   yes
+# @results     JSON
+# @stable      yes
+# @parse       url, title, content
+
 from json import loads
 from urllib import urlencode
 
+# engine dependent config
 categories = ['music']
+paging = True
 
+# api-key
 guest_client_id = 'b45b1aa10f1ac2941910a7f0d10f8e28'
-url = 'https://api.soundcloud.com/'
-search_url = url + 'search?{query}&facet=model&limit=20&offset={offset}&linked_partitioning=1&client_id='+guest_client_id  # noqa
 
-paging = True
+# search-url
+url = 'https://api.soundcloud.com/'
+search_url = url + 'search?{query}&facet=model&limit=20&offset={offset}&linked_partitioning=1&client_id={client_id}'
 
 
+# do search-request
 def request(query, params):
     offset = (params['pageno'] - 1) * 20
+
     params['url'] = search_url.format(query=urlencode({'q': query}),
-                                      offset=offset)
+                                      offset=offset,
+                                      client_id=guest_client_id)
+
     return params
 
 
+# get response from search-request
 def response(resp):
     results = []
+
     search_res = loads(resp.text)
+
+    # parse results
     for result in search_res.get('collection', []):
         if result['kind'] in ('track', 'playlist'):
             title = result['title']
             content = result['description']
+
+            # append result
             results.append({'url': result['permalink_url'],
                             'title': title,
                             'content': content})
+
+    # return results
     return results

searx/settings.yml

 
   - name : soundcloud
     engine : soundcloud
-    categories : music
     shortcut : sc
 
   - name : stackoverflow