diff --git a/arrayqueues/__init__.py b/arrayqueues/__init__.py
index 9dba91c..3d0eb95 100644
--- a/arrayqueues/__init__.py
+++ b/arrayqueues/__init__.py
@@ -8,4 +8,5 @@
 __version__ = "1.2.0"
 
 from arrayqueues.shared_arrays import ArrayQueue
+
 # from arrayqueues.portable_queue import PortableQueue
diff --git a/arrayqueues/portable_queue.py b/arrayqueues/portable_queue.py
index e40ce59..586ee69 100644
--- a/arrayqueues/portable_queue.py
+++ b/arrayqueues/portable_queue.py
@@ -2,10 +2,11 @@
 https://gist.github.com/FanchenBao/d8577599c46eab1238a81857bb7277c9
 """
 
-from multiprocessing import queues, Value, get_context
+from multiprocessing import Value, get_context, queues
+
 
 class SharedCounter(object):
-    """ A synchronized shared counter.
+    """A synchronized shared counter.
 
     The locking done by multiprocessing.Value ensures that only a single
     process or thread may read or write the in-memory ctypes object. However,
@@ -20,9 +21,9 @@ class SharedCounter(object):
     """
 
     def __init__(self, n=0):
-        self.count = Value('i', n)
+        self.count = Value("i", n)
 
-    def increment(self, n = 1):
+    def increment(self, n=1):
         """ Increment the counter by n (default = 1) """
         with self.count.get_lock():
             self.count.value += n
@@ -34,7 +35,7 @@ def value(self):
 
 
 class PortableQueue(queues.Queue):
-    """ A portable implementation of multiprocessing.Queue.
+    """A portable implementation of multiprocessing.Queue.
 
     Because of multithreading / multiprocessing semantics, Queue.qsize() may
     raise the NotImplementedError exception on Unix platforms like Mac OS X
@@ -49,16 +50,24 @@ class PortableQueue(queues.Queue):
 
     def __init__(self, *args, **kwargs):
         self.size = SharedCounter(0)
-        super(PortableQueue, self).__init__(*args, ctx=get_context(),
-                                            **kwargs)
+        super(PortableQueue, self).__init__(*args, ctx=get_context(), **kwargs)
 
     def __getstate__(self):
         state = super(PortableQueue, self).__getstate__()
         return state + (self.size,)
 
     def __setstate__(self, state):
-        (self._ignore_epipe, self._maxsize, self._reader, self._writer,
-         self._rlock, self._wlock, self._sem, self._opid, self.size) = state
+        (
+            self._ignore_epipe,
+            self._maxsize,
+            self._reader,
+            self._writer,
+            self._rlock,
+            self._wlock,
+            self._sem,
+            self._opid,
+            self.size,
+        ) = state
         super(PortableQueue, self)._after_fork()
 
     def put(self, *args, **kwargs):
@@ -77,5 +86,3 @@ def qsize(self):
     def empty(self):
         """ Reliable implementation of multiprocessing.Queue.empty() """
         return not self.qsize()
-
-
diff --git a/arrayqueues/shared_arrays.py b/arrayqueues/shared_arrays.py
index 79583fd..235d333 100644
--- a/arrayqueues/shared_arrays.py
+++ b/arrayqueues/shared_arrays.py
@@ -1,12 +1,13 @@
+from datetime import datetime
 from multiprocessing import Array
+from queue import Empty, Full
 
-#try:
-from arrayqueues.portable_queue import PortableQueue #as Queue
-#except AttributeError:
-    # from multiprocessing import Queue
+# except AttributeError:
+# from multiprocessing import Queue
 import numpy as np
-from datetime import datetime
-from queue import Empty, Full
+
+# try:
+from arrayqueues.portable_queue import PortableQueue  # as Queue
 
 
 class ArrayView:
@@ -122,11 +123,9 @@ def qsize(self):
         return self.queue.qsize()
 
 
-
 class TimestampedArrayQueue(ArrayQueue):
     """A small extension to support timestamps saved alongside arrays"""
 
-    """
     def put(self, element, timestamp=None):
 
         if self.view is None or not self.view.fits(element):
diff --git a/arrayqueues/tests/test_portable_queue.py b/arrayqueues/tests/test_portable_queue.py
index 97da2c6..c80ed5f 100644
--- a/arrayqueues/tests/test_portable_queue.py
+++ b/arrayqueues/tests/test_portable_queue.py
@@ -1,7 +1,9 @@
+import time
 from multiprocessing import Process
-from arrayqueues.portable_queue import PortableQueue
 from queue import Empty
-import time
+
+from arrayqueues.portable_queue import PortableQueue
+
 
 class SourceProcess(Process):
     def __init__(self, n_elements):
@@ -39,4 +41,4 @@ def test_portable_queue():
     time.sleep(0.5)
     assert p1.source_queue.qsize() == 0
     p2.join()
-    p1.join()
\ No newline at end of file
+    p1.join()
diff --git a/arrayqueues/tests/test_shared_arrays.py b/arrayqueues/tests/test_shared_arrays.py
index 75d7b04..147b7e2 100644
--- a/arrayqueues/tests/test_shared_arrays.py
+++ b/arrayqueues/tests/test_shared_arrays.py
@@ -1,11 +1,14 @@
-from arrayqueues.shared_arrays import ArrayQueue, TimestampedArrayQueue, IndexedArrayQueue
+import time
 from multiprocessing import Process
-import multiprocessing.queues
-from  multiprocessing import Queue
-import numpy as np
 from queue import Empty, Full
-import unittest
-import time
+
+import numpy as np
+
+from arrayqueues.shared_arrays import (
+    ArrayQueue,
+    IndexedArrayQueue,
+    TimestampedArrayQueue,
+)
 
 
 class SourceProcess(Process):
@@ -52,7 +55,6 @@ def run(self):
         print(self.source_array.view.total_shape)
 
 
-
 class SinkProcess(Process):
     def __init__(self, source_array, limit=None):
         super().__init__()
@@ -63,7 +65,7 @@ def run(self):
         while True:
             try:
                 item = self.source_array.get(timeout=0.5)
-                print('Got item')
+                print("Got item")
                 assert item[0, 0] == 5
             except Empty:
                 break
@@ -128,6 +130,3 @@ def test_clearing_queue():
     p1.source_array.clear()
     time.sleep(1.0)
     assert p1.source_array.empty()
-
-
-
diff --git a/setup.py b/setup.py
index 4e1d023..bfad377 100644
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,5 @@
 from distutils.core import setup
+
 from setuptools import find_packages
 
 with open("requirements_dev.txt") as f: