diff --git a/utils/helpers.py b/utils/helpers.py
index f18d78a..5739b7f 100644
--- a/utils/helpers.py
+++ b/utils/helpers.py
@@ -26,7 +26,6 @@ class AsyncCrawler(object):
         self.client_session = None
         self.semaphore = asyncio.BoundedSemaphore(concurrency)
 
-
     async def crawl_url(self, url=None):
         '''
         Crawls the given URL and finds all new URLs in the initial page.
@@ -38,7 +37,6 @@ class AsyncCrawler(object):
 
         return urls
 
-
     def validate_url(self, url=None):
         '''
         Ensures we have a valid URL to crawl and that the site's robots.txt
@@ -52,7 +50,6 @@ class AsyncCrawler(object):
         else:
             return False
 
-
     async def get_source(self, url=None):
         '''
         Obtains the URL's source, provided it is HTML. Usage of semaphores
@@ -72,7 +69,6 @@ class AsyncCrawler(object):
                     except Exception:
                         return None
 
-
     def find_all_urls(self, source=None):
         '''
         Find all URLs in a page's source. Returns a list of URLs which have
@@ -91,13 +87,12 @@ class AsyncCrawler(object):
 
         return urls
 
-
     async def run(self, urls=None):
         '''
         Crawls a batch of URLs of any size (resource usage is bounded by n
         semaphores (where n = concurrency). Returns a set of URLs to be added
-        to the list of URLs which need to be crawled (find_all_urls only returns
-        unseen URLs).
+        to the list of URLs which need to be crawled (find_all_urls only
+        returns unseen URLs).
         '''
         tasks = []
         all_urls = set()
@@ -111,7 +106,6 @@ class AsyncCrawler(object):
         for task in asyncio.as_completed(tasks):
             urls = None
             try:
-                # completed.append((await task))
                 urls = await task
             except Exception as e:
                 print(e)
@@ -124,7 +118,6 @@ class AsyncCrawler(object):
 
         return all_urls
 
-
     async def main(self):
         '''
         Runs a crawl with batches of URLs. Once complete returns a list of all
@@ -180,7 +173,6 @@ class RobotsTxt(object):
 
         self.robots = robots
 
-
     def check(self, url):
         '''
         Test if robots allows us to crawl that URL.
@@ -190,19 +182,21 @@ class RobotsTxt(object):
 
 def standardise_url(url=None, base_url=None):
     '''
-    If `base_url` is None then we attempt to standarise the URL to ensure it can
-    be prepended to relative URLs. If no scheme has been provided then we default
-    to http as any sane https-only site should 301 redirect http > https.
+    If `base_url` is None then we attempt to standarise the URL to ensure it
+    can be prepended to relative URLs. If no scheme has been provided then we
+    default to http as any sane https-only site should 301 redirect http to
+    https.
 
-    If `base_url` is set, we standardise URLs to strip queries and fragments (we
-    don't want to scrape in-page anchors etc). Any relative URLs will be appended
-    to the base url.
+    If `base_url` is set, we standardise URLs to strip queries and fragments
+    (we don't want to scrape in-page anchors etc). Any relative URLs will be
+    appended to the base url.
 
     Returns a standardised URL as a string.
     '''
     default_proto = 'http'
     delim = '://'
-    file_extensions = ('/', 'htm', 'html', 'xhtml', 'php', 'asp', 'aspx', 'cfm')
+    file_extensions = ('/', 'htm', 'html', 'xhtml', 'php', 'asp', 'aspx',
+                       'cfm')
 
     split_url = urlsplit(url)
 
@@ -219,6 +213,7 @@ def standardise_url(url=None, base_url=None):
         if url.startswith('/'):
             return urljoin(base_url, split_url.path)
         elif url.startswith(base_url):
-            return "".join([split_url.scheme, delim, split_url.netloc, split_url.path])
+            return "".join([split_url.scheme, delim, split_url.netloc,
+                            split_url.path])
 
     return None