diff --git a/aiocache/exceptions.py b/aiocache/exceptions.py
index ead77b9c..e5db3b4d 100644
--- a/aiocache/exceptions.py
+++ b/aiocache/exceptions.py
@@ -1,4 +1,2 @@
-
-
 class InvalidCacheType(Exception):
     pass
diff --git a/aiocache/factory.py b/aiocache/factory.py
index d24b5256..2d711e77 100644
--- a/aiocache/factory.py
+++ b/aiocache/factory.py
@@ -36,14 +36,14 @@ def _create_cache(cache, serializer=None, plugins=None, **kwargs):
 
 class Cache:
 
-    MEMORY = 'memory'
-    REDIS = 'redis'
-    MEMCACHED = 'memcached'
+    MEMORY = "memory"
+    REDIS = "redis"
+    MEMCACHED = "memcached"
 
     _PROTOCOL_MAPPING = {
-        'memory': SimpleMemoryCache,
-        'redis': RedisCache,
-        'memcached': MemcachedCache,
+        "memory": SimpleMemoryCache,
+        "redis": RedisCache,
+        "memcached": MemcachedCache,
     }
 
     def __new__(cls, cache_type=MEMORY, **kwargs):
@@ -51,8 +51,8 @@ def __new__(cls, cache_type=MEMORY, **kwargs):
             cache_class = cls.get_protocol_class(cache_type)
         except KeyError as e:
             raise InvalidCacheType(
-                'Invalid cache type, you can only use {}'.format(
-                    list(cls._PROTOCOL_MAPPING.keys()))) from e
+                "Invalid cache type, you can only use {}".format(list(cls._PROTOCOL_MAPPING.keys()))
+            ) from e
 
         instance = cache_class.__new__(cache_class, **kwargs)
         instance.__init__(**kwargs)
diff --git a/tests/ut/test_factory.py b/tests/ut/test_factory.py
index 46e28ec5..bad0e866 100644
--- a/tests/ut/test_factory.py
+++ b/tests/ut/test_factory.py
@@ -34,9 +34,9 @@ def test_create_cache_with_everything():
 
 class TestCache:
     def test_cache_types(self):
-        assert Cache.MEMORY == 'memory'
-        assert Cache.REDIS == 'redis'
-        assert Cache.MEMCACHED == 'memcached'
+        assert Cache.MEMORY == "memory"
+        assert Cache.REDIS == "redis"
+        assert Cache.MEMCACHED == "memcached"
 
     @pytest.mark.parametrize("cache_type", [Cache.MEMORY, Cache.REDIS, Cache.MEMCACHED])
     def test_new(self, cache_type):
@@ -53,9 +53,10 @@ def test_new_defaults_to_memory(self):
 
     def test_new_invalid_cache_raises(self):
         with pytest.raises(InvalidCacheType) as e:
-            Cache('file')
-        assert str(e.value) == \
-            "Invalid cache type, you can only use ['memory', 'redis', 'memcached']"
+            Cache("file")
+        assert str(e.value) == "Invalid cache type, you can only use {}".format(
+            list(Cache._PROTOCOL_MAPPING.keys())
+        )
 
     @pytest.mark.parametrize("protocol", [Cache.MEMORY, Cache.REDIS, Cache.MEMCACHED])
     def test_get_protocol_class(self, protocol):
@@ -63,7 +64,7 @@ def test_get_protocol_class(self, protocol):
 
     def test_get_protocol_class_invalid(self):
         with pytest.raises(KeyError):
-            Cache.get_protocol_class('http')
+            Cache.get_protocol_class("http")
 
 
 class TestCacheHandler: