diff --git a/screen.py b/screen.py
index c6b3c02..5c03e9e 100644
--- a/screen.py
+++ b/screen.py
@@ -121,7 +121,7 @@ class Bitmap:
     def to_bytemap(self) -> Bytemap:
         return self._to_bytemap(self.bitmap)
 
-    def to_memory_map(self, screen_page:int) -> "MemoryMap":
+    def to_memory_map(self, screen_page: int) -> "MemoryMap":
         return self.to_bytemap().to_memory_map(screen_page)
 
     @staticmethod
@@ -176,7 +176,7 @@ class DHGRBitmap(Bitmap):
 class FlatMemoryMap:
     """Linear 8K representation of HGR screen memory."""
 
-    def __init__(self, screen_page: int, data: np.array=None):
+    def __init__(self, screen_page: int, data: np.array = None):
         if screen_page not in [1, 2]:
             raise ValueError("Screen page out of bounds: %d" % screen_page)
         self.screen_page = screen_page  # type: int
@@ -205,7 +205,7 @@ class FlatMemoryMap:
 class MemoryMap:
     """Page/offset-structured representation of HGR screen memory."""
 
-    def __init__(self, screen_page: int, page_offset: np.array=None):
+    def __init__(self, screen_page: int, page_offset: np.array = None):
         if screen_page not in [1, 2]:
             raise ValueError("Screen page out of bounds: %d" % screen_page)
         self.screen_page = screen_page  # type: int
diff --git a/symbol_table_test.py b/symbol_table_test.py
index 4d1855c..965b36c 100644
--- a/symbol_table_test.py
+++ b/symbol_table_test.py
@@ -23,8 +23,8 @@ class TestSymbolTable(unittest.TestCase):
     def test_parse(self):
         dbg = io.StringIO(DEBUG_FILE)
         s = symbol_table.SymbolTable()
-        self.assertEqual({"\"op_ack\"", "\"op_tick\"", "\"rle1\""},
-                            s.parse(dbg).keys())
+        self.assertEqual(
+            {"\"op_ack\"", "\"op_tick\"", "\"rle1\""}, s.parse(dbg).keys())
 
 
 if __name__ == '__main__':
diff --git a/video.py b/video.py
index 061edb0..6009910 100644
--- a/video.py
+++ b/video.py
@@ -56,7 +56,7 @@ class Video:
             yield Image.fromarray(frame_array)
 
     @staticmethod
-    def _rgb(r,g,b):
+    def _rgb(r, g, b):
         return (r << 16) + (g << 8) + b
 
     # def dither_framesframes(self) -> Iterator[screen.MemoryMap]:
diff --git a/video_test.py b/video_test.py
index 771a44c..a5f8d87 100644
--- a/video_test.py
+++ b/video_test.py
@@ -39,7 +39,6 @@ class TestByteToColourString(unittest.TestCase):
             "1OOO", video.byte_to_colour_string(0xd5, is_odd_offset=True))
 
 
-
 class TestEditWeight(unittest.TestCase):
     def testTransposition(self):
         self.assertEqual("WKK0", video.byte_to_colour_string(