diff --git a/CONTRIBUTORS.txt b/CONTRIBUTORS.txt
index 576f9cb..10537ff 100644
--- a/CONTRIBUTORS.txt
+++ b/CONTRIBUTORS.txt
@@ -86,5 +86,8 @@ In chronological order:
 * @p-vitt & @M4a1x
   * Documentation on troubleshooting for uberspace users
 
+* @benjhess
+  * Optionnal gravatar support
+
 * [Your name or handle] <[email or website]>
   * [Brief summary of your changes]
diff --git a/isso/migrate.py b/isso/migrate.py
index f6297b7..2296e3c 100644
--- a/isso/migrate.py
+++ b/isso/migrate.py
@@ -55,7 +55,7 @@ class Progress(object):
 
         if time() - self.last > 0.2:
             sys.stdout.write("\r{0}".format(" " * cols))
-            sys.stdout.write("\r[{0:.0%}]  {1}".format(i/self.end, message))
+            sys.stdout.write("\r[{0:.0%}]  {1}".format(i / self.end, message))
             sys.stdout.flush()
             self.last = time()
 
diff --git a/isso/tests/test_comments.py b/isso/tests/test_comments.py
index a4ae5a5..fa32039 100644
--- a/isso/tests/test_comments.py
+++ b/isso/tests/test_comments.py
@@ -134,13 +134,13 @@ class TestComments(unittest.TestCase):
             self.assertFalse(verify({"text": text}))
 
         # email/website length
-        self.assertTrue(verify({"text": "...", "email": "*"*254}))
+        self.assertTrue(verify({"text": "...", "email": "*" * 254}))
         self.assertTrue(
-            verify({"text": "...", "website": "google.de/" + "a"*128}))
+            verify({"text": "...", "website": "google.de/" + "a" * 128}))
 
-        self.assertFalse(verify({"text": "...", "email": "*"*1024}))
+        self.assertFalse(verify({"text": "...", "email": "*" * 1024}))
         self.assertFalse(
-            verify({"text": "...", "website": "google.de/" + "*"*1024}))
+            verify({"text": "...", "website": "google.de/" + "*" * 1024}))
 
         # valid website url
         self.assertTrue(comments.isurl("example.tld"))
diff --git a/isso/utils/__init__.py b/isso/utils/__init__.py
index 254aab1..ed925a9 100644
--- a/isso/utils/__init__.py
+++ b/isso/utils/__init__.py
@@ -36,7 +36,7 @@ def anonymize(remote_addr):
             ipv6 = ipaddress.IPv6Address(remote_addr)
             if ipv6.ipv4_mapped is not None:
                 return anonymize(ipv6.ipv4_mapped)
-            return u'' + ipv6.exploded.rsplit(':', 5)[0] + ':' + ':'.join(['0000']*5)
+            return u'' + ipv6.exploded.rsplit(':', 5)[0] + ':' + ':'.join(['0000'] * 5)
         except ipaddress.AddressValueError:
             return u'0.0.0.0'
 
@@ -89,11 +89,11 @@ class Bloomfilter:
 
     def add(self, key):
         for i in self.get_probes(key):
-            self.array[i//8] |= 2 ** (i % 8)
+            self.array[i // 8] |= 2 ** (i % 8)
         self.elements += 1
 
     def __contains__(self, key):
-        return all(self.array[i//8] & (2 ** (i % 8)) for i in self.get_probes(key))
+        return all(self.array[i // 8] & (2 ** (i % 8)) for i in self.get_probes(key))
 
     def __len__(self):
         return self.elements
diff --git a/isso/utils/hash.py b/isso/utils/hash.py
index d964036..93a084e 100644
--- a/isso/utils/hash.py
+++ b/isso/utils/hash.py
@@ -110,4 +110,4 @@ def new(conf):
 
 
 sha1 = Hash(func="sha1").uhash
-md5 = Hash(func="md5").uhash
\ No newline at end of file
+md5 = Hash(func="md5").uhash
diff --git a/isso/views/comments.py b/isso/views/comments.py
index a6f39fc..b76be46 100644
--- a/isso/views/comments.py
+++ b/isso/views/comments.py
@@ -732,6 +732,7 @@ class API(object):
                 comment['replies'] = self._process_fetched_list(replies, plain)
 
         return JSON(rv, 200)
+
     def _add_gravatar_image(self, item):
         if not self.conf.getboolean('gravatar'):
             return item
@@ -743,6 +744,7 @@ class API(object):
         item['gravatar_image'] = gravatar_url.format(email_md5_hash)
 
         return item
+
     def _process_fetched_list(self, fetched_list, plain=False):
         for item in fetched_list:
 
@@ -851,7 +853,6 @@ class API(object):
     @apiSuccessExample Counts of 5 threads:
         [2, 18, 4, 0, 3]
     """
-
     def counts(self, environ, request):
 
         data = request.get_json()
diff --git a/isso/wsgi.py b/isso/wsgi.py
index 60c1a58..864d017 100644
--- a/isso/wsgi.py
+++ b/isso/wsgi.py
@@ -30,7 +30,7 @@ def host(environ):  # pragma: no cover
     of http://www.python.org/dev/peps/pep-0333/#url-reconstruction
     """
 
-    url = environ['wsgi.url_scheme']+'://'
+    url = environ['wsgi.url_scheme'] + '://'
 
     if environ.get('HTTP_HOST'):
         url += environ['HTTP_HOST']