diff --git a/Tests/check_j2k_overflow.py b/Tests/check_j2k_overflow.py
index de671a53f..474b49948 100644
--- a/Tests/check_j2k_overflow.py
+++ b/Tests/check_j2k_overflow.py
@@ -1,6 +1,7 @@
 from PIL import Image
 from helper import unittest, PillowTestCase
 
+
 class TestJ2kEncodeOverflow(PillowTestCase):
     def test_j2k_overflow(self):
 
@@ -12,7 +13,7 @@ class TestJ2kEncodeOverflow(PillowTestCase):
         except IOError as err:
             self.assertTrue(True, "IOError is expected")
         except Exception as err:
-            self.assertTrue(False, "Expected IOError, got %s" %type(err))
+            self.assertTrue(False, "Expected IOError, got %s" % type(err))
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/Tests/test_file_bmp.py b/Tests/test_file_bmp.py
index 5d6b30e79..36bc84d84 100644
--- a/Tests/test_file_bmp.py
+++ b/Tests/test_file_bmp.py
@@ -77,6 +77,5 @@ class TestFileBmp(PillowTestCase):
         self.assert_image_equal(im, target)
 
 
-
 if __name__ == '__main__':
     unittest.main()
diff --git a/Tests/test_file_libtiff.py b/Tests/test_file_libtiff.py
index ef86a1136..378bd6377 100644
--- a/Tests/test_file_libtiff.py
+++ b/Tests/test_file_libtiff.py
@@ -170,7 +170,8 @@ class TestFileLibTiff(LibTiffTestCase):
                                 'RowsPerStrip',
                                 'StripOffsets']
             for field in requested_fields:
-                self.assertTrue(field in reloaded, "%s not in metadata" % field)
+                self.assertTrue(field in reloaded,
+                                "%s not in metadata" % field)
 
     def test_additional_metadata(self):
         # these should not crash. Seriously dummy data, most of it doesn't make
@@ -183,7 +184,8 @@ class TestFileLibTiff(LibTiffTestCase):
                                                         in TiffTags.LIBTIFF_CORE]
                           if info.type is not None)
 
-        # Exclude ones that have special meaning that we're already testing them
+        # Exclude ones that have special meaning
+        # that we're already testing them
         im = Image.open('Tests/images/hopper_g4.tif')
         for tag in im.tag_v2.keys():
             try:
@@ -422,8 +424,8 @@ class TestFileLibTiff(LibTiffTestCase):
     def test_gray_semibyte_per_pixel(self):
         test_files = (
             (
-                24.8,#epsilon
-                (#group
+                24.8,  # epsilon
+                (  # group
                     "Tests/images/tiff_gray_2_4_bpp/hopper2.tif",
                     "Tests/images/tiff_gray_2_4_bpp/hopper2I.tif",
                     "Tests/images/tiff_gray_2_4_bpp/hopper2R.tif",
@@ -431,8 +433,8 @@ class TestFileLibTiff(LibTiffTestCase):
                 )
             ),
             (
-                7.3,#epsilon
-                (#group
+                7.3,  # epsilon
+                (  # group
                     "Tests/images/tiff_gray_2_4_bpp/hopper4.tif",
                     "Tests/images/tiff_gray_2_4_bpp/hopper4I.tif",
                     "Tests/images/tiff_gray_2_4_bpp/hopper4R.tif",
@@ -504,6 +506,5 @@ class TestFileLibTiff(LibTiffTestCase):
         im.save(outfile)
 
 
-
 if __name__ == '__main__':
     unittest.main()
diff --git a/Tests/test_file_png.py b/Tests/test_file_png.py
index 4bdfb603b..418aaf41e 100644
--- a/Tests/test_file_png.py
+++ b/Tests/test_file_png.py
@@ -313,7 +313,7 @@ class TestFilePng(PillowTestCase):
         #                  -14: malformed chunk
 
         for offset in (-10, -13, -14):
-            with open(TEST_PNG_FILE,'rb') as f:
+            with open(TEST_PNG_FILE, 'rb') as f:
                 test_file = f.read()[:offset]
 
             im = Image.open(BytesIO(test_file))
@@ -347,7 +347,6 @@ class TestFilePng(PillowTestCase):
         finally:
             ImageFile.LOAD_TRUNCATED_IMAGES = False
 
-
     def test_roundtrip_dpi(self):
         # Check dpi roundtripping
 
diff --git a/Tests/test_image_access.py b/Tests/test_image_access.py
index 40f648f27..be7457bb7 100644
--- a/Tests/test_image_access.py
+++ b/Tests/test_image_access.py
@@ -105,6 +105,7 @@ class TestCffiPutPixel(TestImagePutPixel):
     def setUp(self):
         try:
             import cffi
+            assert cffi  # silence warning
         except ImportError:
             self.skipTest("No cffi")
 
@@ -115,6 +116,7 @@ class TestCffiGetPixel(TestImageGetPixel):
     def setUp(self):
         try:
             import cffi
+            assert cffi  # silence warning
         except ImportError:
             self.skipTest("No cffi")
 
@@ -125,6 +127,7 @@ class TestCffi(AccessTest):
     def setUp(self):
         try:
             import cffi
+            assert cffi  # silence warning
         except ImportError:
             self.skipTest("No cffi")
 
diff --git a/Tests/test_imagepath.py b/Tests/test_imagepath.py
index 1df9715e0..d5ec5dfaa 100644
--- a/Tests/test_imagepath.py
+++ b/Tests/test_imagepath.py
@@ -5,6 +5,7 @@ from PIL import ImagePath, Image
 import array
 import struct
 
+
 class TestImagePath(PillowTestCase):
 
     def test_path(self):
@@ -61,7 +62,6 @@ class TestImagePath(PillowTestCase):
             p = ImagePath.Path(arr.tostring())
         self.assertEqual(list(p), [(0.0, 1.0)])
 
-
     def test_overflow_segfault(self):
         try:
             # post patch, this fails with a memory error
diff --git a/Tests/test_imagesequence.py b/Tests/test_imagesequence.py
index f79c5fe87..8c65e6358 100644
--- a/Tests/test_imagesequence.py
+++ b/Tests/test_imagesequence.py
@@ -56,7 +56,7 @@ class TestImageSequence(PillowTestCase):
         im = Image.open('Tests/images/multipage.tiff')
         firstFrame = None
         for frame in ImageSequence.Iterator(im):
-            if firstFrame == None:
+            if firstFrame is None:
                 firstFrame = frame.copy()
             pass
         for frame in ImageSequence.Iterator(im):
diff --git a/Tests/test_imagetk.py b/Tests/test_imagetk.py
index d29953453..f56333a59 100644
--- a/Tests/test_imagetk.py
+++ b/Tests/test_imagetk.py
@@ -8,6 +8,7 @@ except (OSError, ImportError) as v:
     # Skipped via setUp()
     pass
 
+
 class TestImageTk(PillowTestCase):
 
     def setUp(self):
@@ -24,7 +25,7 @@ class TestImageTk(PillowTestCase):
         im2 = Image.open(TEST_PNG)
         with open(TEST_PNG, 'rb') as fp:
             data = fp.read()
-        kw = {"file":TEST_JPG, "data":data}
+        kw = {"file": TEST_JPG, "data": data}
 
         # Test "file"
         im = ImageTk._get_image_from_kw(kw)
diff --git a/Tests/test_imagewin_pointers.py b/Tests/test_imagewin_pointers.py
index 692868bdf..f37c67eac 100644
--- a/Tests/test_imagewin_pointers.py
+++ b/Tests/test_imagewin_pointers.py
@@ -57,7 +57,10 @@ if sys.platform.startswith('win32'):
     DeleteObject.argtypes = [ctypes.wintypes.HGDIOBJ]
 
     CreateDIBSection = ctypes.windll.gdi32.CreateDIBSection
-    CreateDIBSection.argtypes = [ctypes.wintypes.HDC, ctypes.c_void_p, ctypes.c_uint, ctypes.POINTER(ctypes.c_void_p), ctypes.wintypes.HANDLE, ctypes.wintypes.DWORD]
+    CreateDIBSection.argtypes = [ctypes.wintypes.HDC, ctypes.c_void_p,
+                                 ctypes.c_uint,
+                                 ctypes.POINTER(ctypes.c_void_p),
+                                 ctypes.wintypes.HANDLE, ctypes.wintypes.DWORD]
     CreateDIBSection.restype = ctypes.wintypes.HBITMAP
 
     def serialize_dib(bi, pixels):
@@ -99,7 +102,8 @@ if sys.platform.startswith('win32'):
             hdc = CreateCompatibleDC(None)
             # print('hdc:',hex(hdc))
             pixels = ctypes.c_void_p()
-            dib = CreateDIBSection(hdc, ctypes.byref(hdr), DIB_RGB_COLORS, ctypes.byref(pixels), None, 0)
+            dib = CreateDIBSection(hdc, ctypes.byref(hdr), DIB_RGB_COLORS,
+                                   ctypes.byref(pixels), None, 0)
             SelectObject(hdc, dib)
 
             imdib.expose(hdc)
diff --git a/Tests/test_numpy.py b/Tests/test_numpy.py
index 804ff832f..40b7c64e3 100644
--- a/Tests/test_numpy.py
+++ b/Tests/test_numpy.py
@@ -6,6 +6,8 @@ from PIL import Image
 try:
     import site
     import numpy
+    assert site  # silence warning
+    assert numpy  # silence warning
 except ImportError:
     # Skip via setUp()
     pass
@@ -18,6 +20,8 @@ class TestNumpy(PillowTestCase):
         try:
             import site
             import numpy
+            assert site  # silence warning
+            assert numpy  # silence warning
         except ImportError:
             self.skipTest("ImportError")
 
diff --git a/Tests/test_tiff_ifdrational.py b/Tests/test_tiff_ifdrational.py
index 3a38f2237..dd3ad1b3d 100644
--- a/Tests/test_tiff_ifdrational.py
+++ b/Tests/test_tiff_ifdrational.py
@@ -48,7 +48,7 @@ class Test_IFDRational(PillowTestCase):
         methods = (True, False)
         if 'libtiff_encoder' not in dir(Image.core):
             methods = (False)
-            
+
         for libtiff in methods:
             TiffImagePlugin.WRITE_LIBTIFF = libtiff