diff --git a/docs/conf.py b/docs/conf.py
index 3b7e483f..8a189c14 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -142,7 +142,7 @@
 # (source start file, name, description, authors, manual section).
 man_pages = [
     (master_doc, 'pursuedpybear', 'PursuedPyBear Documentation',
-     [author], 1)
+     [author], 1),
 ]
 
 
@@ -181,4 +181,4 @@
 # -- Options for todo extension ----------------------------------------------
 
 # If true, `todo` and `todoList` produce output, else they produce nothing.
-todo_include_todos = True
\ No newline at end of file
+todo_include_todos = True
diff --git a/examples/animated_sprite.py b/examples/animated_sprite.py
index 81fd7e5c..b5aea0da 100644
--- a/examples/animated_sprite.py
+++ b/examples/animated_sprite.py
@@ -1,8 +1,8 @@
 import math
 
 import ppb
-from ppb.features.animation import Animation
 import ppb.events as events
+from ppb.features.animation import Animation
 
 
 class Blob(ppb.BaseSprite):
diff --git a/examples/framecount.py b/examples/framecount.py
index 9560b6fa..b9d6e728 100644
--- a/examples/framecount.py
+++ b/examples/framecount.py
@@ -8,6 +8,7 @@
 
 import logging
 import time
+
 import ppb
 
 
diff --git a/examples/targets.py b/examples/targets.py
index d5eff598..b6605cf7 100644
--- a/examples/targets.py
+++ b/examples/targets.py
@@ -1,7 +1,8 @@
 import logging
+
 import ppb
-from ppb import Vector
 from ppb import keycodes
+from ppb import Vector
 
 
 class MoverMixin(ppb.BaseSprite):
@@ -39,7 +40,7 @@ def on_button_pressed(self, event, signal):
     def _fire_bullet(self, scene):
         scene.add(
             Bullet(pos=self.position),
-            tags=['bullet']
+            tags=['bullet'],
         )
 
 
@@ -51,7 +52,7 @@ def on_update(self, update, signal):
         super().on_update(update, signal)  # Execute movement
 
         scene = update.scene
-        
+
         if self.position.y > scene.main_camera.frame_bottom:
             scene.remove(self)
         else:
diff --git a/examples/targets_with_twisted.py b/examples/targets_with_twisted.py
index 596e723b..f5ac3ebf 100644
--- a/examples/targets_with_twisted.py
+++ b/examples/targets_with_twisted.py
@@ -1,14 +1,15 @@
-import logging
-import ppb
-from ppb import Vector
-from ppb import keycodes
+from dataclasses import dataclass
+from typing import Any
+
+import klein
 from twisted.internet import defer
-from twisted.internet import task
 from twisted.internet import endpoints
+from twisted.internet import task
 from twisted.web.server import Site
-import klein
-from dataclasses import dataclass
-from typing import Any
+
+import ppb
+from ppb import keycodes
+from ppb import Vector
 
 
 class MoverMixin(ppb.BaseSprite):
@@ -45,7 +46,7 @@ def on_button_pressed(self, event, signal):
     def _fire_bullet(self, scene):
         scene.add(
             Bullet(pos=self.position),
-            tags=['bullet']
+            tags=['bullet'],
         )
 
 
@@ -74,7 +75,7 @@ def on_update(self, update, signal):
         super().on_update(update, signal)  # Execute movement
 
         scene = update.scene
-        
+
         if self.position.y > scene.main_camera.frame_bottom:
             scene.remove(self)
         else:
@@ -102,7 +103,7 @@ def __init__(self, *p, **kw):
             self.add(Target(pos=Vector(x, 1.875)), tags=['target'])
 
 
-######### This is "non-game-specific code" ###########
+# This is "non-game-specific code"
 class _FinishLoop(Exception):
     pass
 
@@ -119,7 +120,7 @@ def loop_once(engine):
         yield loop.start(0.001)
     except _FinishLoop:
         pass
-######### End of "non-game-specific code" ###########
+# End of "non-game-specific code"
 
 
 @defer.inlineCallbacks
@@ -128,10 +129,11 @@ def main(reactor):
         TargetCounter.web_server(
             reactor=reactor,
             engine=engine,
-            description="tcp:8080"
+            description="tcp:8080",
         )
         yield twisted_engine_loop(engine)
 
+
 if __name__ == "__main__":
     import sys
     task.react(main, sys.argv[1:])
diff --git a/ppb/__init__.py b/ppb/__init__.py
index 0ec0774a..ec924da3 100644
--- a/ppb/__init__.py
+++ b/ppb/__init__.py
@@ -25,7 +25,8 @@ def _make_kwargs(setup, title):
     }
     return kwargs
 
-def run(setup: Callable[[BaseScene], None]=None, *, log_level=logging.WARNING,
+
+def run(setup: Callable[[BaseScene], None] = None, *, log_level=logging.WARNING,
         starting_scene=BaseScene, title="PursuedPyBear"):
     """
     Run a small game.
@@ -45,6 +46,6 @@ def run(setup: Callable[[BaseScene], None]=None, *, log_level=logging.WARNING,
         eng.run()
 
 
-def make_engine(setup: Callable[[BaseScene], None]=None, *,
+def make_engine(setup: Callable[[BaseScene], None] = None, *,
                 starting_scene=BaseScene, title="PursedPyBear"):
     return GameEngine(starting_scene, **_make_kwargs(setup, title))
diff --git a/ppb/abc.py b/ppb/abc.py
index 366dff96..a86a0419 100644
--- a/ppb/abc.py
+++ b/ppb/abc.py
@@ -1,4 +1,6 @@
-from typing import Type, Container, Tuple, Iterable
+from typing import Iterable
+from typing import Tuple
+from typing import Type
 
 
 class Engine(object):
diff --git a/ppb/camera.py b/ppb/camera.py
index 6a9d58ee..355356e7 100644
--- a/ppb/camera.py
+++ b/ppb/camera.py
@@ -1,17 +1,17 @@
-from typing import Sequence
-from typing import Union
 from numbers import Number
+from typing import Sequence
 
 from ppb import Vector
-from ppb.sprites import BaseSprite
 from ppb.flags import DoNotRender
+from ppb.sprites import BaseSprite
+
 
 class Camera(BaseSprite):
 
     image = DoNotRender
 
-    def __init__(self, viewport: Sequence[int]=(0, 0, 800, 600),
-                 pixel_ratio: float=64):
+    def __init__(self, viewport: Sequence[int] = (0, 0, 800, 600),
+                 pixel_ratio: float = 64):
         """
 
         viewport: A container of origin x, origin y, width, and
@@ -64,6 +64,7 @@ def half_height(self) -> float:
     @property
     def half_width(self) -> float:
         return self.frame_width / 2
+
     @property
     def viewport_width(self) -> int:
         return self._viewport_width
@@ -82,25 +83,26 @@ def viewport_height(self, value: int):
         self._viewport_height = value
         self.viewport_offset = Vector(self.viewport_width / 2, value / 2)
 
-    def point_in_viewport(self, point:Vector) -> bool:
+    def point_in_viewport(self, point: Vector) -> bool:
         px, py = point
         vpx, vpy = self.viewport_origin
         vpw = self.viewport_width
         vph = self.viewport_height
-        return vpx <= px <= (vpw+vpx) and vpy <= py <= (vph+vpy)
+        return vpx <= px <= (vpw + vpx) and vpy <= py <= (vph + vpy)
 
     def in_frame(self, sprite: BaseSprite) -> bool:
-        return (self.frame_left <= sprite.right and
-                self.frame_right >= sprite.left and
-                self.frame_top <= sprite.bottom and
-                self.frame_bottom >= sprite.top
-                )
+        return (
+            self.frame_left <= sprite.right and
+            self.frame_right >= sprite.left and
+            self.frame_top <= sprite.bottom and
+            self.frame_bottom >= sprite.top
+        )
 
     def translate_to_frame(self, point: Vector) -> Vector:
         """
         Converts a vector from pixel-based window to in-game coordinate space
         """
-        offset = (point - self.viewport_offset) * (1/self.pixel_ratio)
+        offset = (point - self.viewport_offset) * (1 / self.pixel_ratio)
         loc = self.position + offset
         return loc.update(y=-loc.y)
 
diff --git a/ppb/engine.py b/ppb/engine.py
index 4101c4a4..d6d55216 100644
--- a/ppb/engine.py
+++ b/ppb/engine.py
@@ -1,8 +1,8 @@
+import time
 from collections import defaultdict
 from collections import deque
 from contextlib import ExitStack
 from itertools import chain
-import time
 from typing import Any
 from typing import Callable
 from typing import DefaultDict
@@ -12,9 +12,9 @@
 
 import ppb.events as events
 from ppb.abc import Engine
-from ppb.events import StartScene
 from ppb.events import EventMixin
 from ppb.events import Quit
+from ppb.events import StartScene
 from ppb.systems import PygameEventPoller
 from ppb.systems import Renderer
 from ppb.systems import Updater
@@ -40,7 +40,8 @@ def __init__(self, first_scene: Type, *,
         # Engine State
         self.scenes = []
         self.events = deque()
-        self.event_extensions: DefaultDict[Union[Type, _ellipsis], List[Callable[[Any], None]]] = defaultdict(list)
+        self.event_extensions: DefaultDict[Union[Type, _ellipsis],
+                                           List[Callable[[Any], None]]] = defaultdict(list)
         self.running = False
         self.entered = False
         self._last_idle_time = None
diff --git a/ppb/events.py b/ppb/events.py
index e6ab74a1..84daa749 100644
--- a/ppb/events.py
+++ b/ppb/events.py
@@ -1,6 +1,6 @@
-from dataclasses import dataclass
 import logging
 import re
+from dataclasses import dataclass
 from typing import Any
 from typing import Collection
 from typing import Dict
@@ -8,10 +8,10 @@
 from typing import Type
 from typing import Union
 
+from ppb import Vector
 from ppb.abc import Scene
 from ppb.buttons import MouseButton
 from ppb.keycodes import KeyCode
-from ppb import Vector
 
 __all__ = (
     'StartScene',
@@ -31,6 +31,7 @@
 boundaries_finder = re.compile('(.)([A-Z][a-z]+)')
 boundaries_finder_2 = re.compile('([a-z0-9])([A-Z])')
 
+
 def camel_to_snake(txt):
     s1 = boundaries_finder.sub(r'\1_\2', txt)
     return boundaries_finder_2.sub(r'\1_\2', s1).lower()
@@ -46,9 +47,10 @@ def __init__(self, instance, method, event):
         article = ['a', 'an'][int(e_name.lower()[0] in "aeiou")]
 
         message = f"""
-{o_name}.{method}() signature incorrect, it should accept {article} {e_name} object and a signal function.
+The signature of {o_name}.{method}() is incorrect:
+it should accept {article} {e_name} object and a signal function.
 
-{e_name} is a dataclass that represents an event. Its attributes 
+{e_name} is a dataclass that represents an event. Its attributes
 tell you about the event.
 
 The signal function is a function you can call that accepts an event instance
diff --git a/ppb/features/animation.py b/ppb/features/animation.py
index f4b448ef..e0e87b99 100644
--- a/ppb/features/animation.py
+++ b/ppb/features/animation.py
@@ -3,8 +3,8 @@
 
 Only supports frame-by-frame, not gif, apng, or full motion video.
 """
-import time
 import re
+import time
 
 FILE_PATTERN = re.compile(r'\{(\d+)\.\.(\d+)\}')
 
diff --git a/ppb/keycodes.py b/ppb/keycodes.py
index ab0b9ff4..56a97537 100644
--- a/ppb/keycodes.py
+++ b/ppb/keycodes.py
@@ -48,7 +48,7 @@ class H(KeyCode):
     ""
 
 
-class I(KeyCode):
+class I(KeyCode):  # noqa: E742
     ""
 
 
@@ -72,7 +72,7 @@ class N(KeyCode):
     ""
 
 
-class O(KeyCode):
+class O(KeyCode):  # noqa: E742
     ""
 
 
@@ -291,7 +291,7 @@ class AltLeft(KeyCode):
 class Backslash(KeyCode):
     """
     \\
-    
+
     Shift+\\ is | on american keyboards
     """
 
@@ -303,7 +303,7 @@ class Backspace(KeyCode):
 class BracketLeft(KeyCode):
     """
     [
-    
+
     Shift+[ is { on american keyboards
     """
 
@@ -311,7 +311,7 @@ class BracketLeft(KeyCode):
 class BracketRight(KeyCode):
     """
     ]
-    
+
     Shift+] is } on american keyboards
     """
 
@@ -323,7 +323,7 @@ class CapsLock(KeyCode):
 class Comma(KeyCode):
     """
     ,
-    
+
     Shift+, is < on american keyboards
     """
 
@@ -395,7 +395,7 @@ class Menu(KeyCode):
 class Minus(KeyCode):
     """
     -
-    
+
     Shift+- is _ on american keyboards
     """
 
@@ -415,7 +415,7 @@ class PageUp(KeyCode):
 class Pause(KeyCode):
     """
     Pause, generally lives next to Print Screen and Scroll Lock.
-    
+
     Also Break.
     """
 
@@ -423,7 +423,7 @@ class Pause(KeyCode):
 class Period(KeyCode):
     """
     .
-    
+
     Shift+. is > on american keyboards
     """
 
@@ -499,4 +499,4 @@ class Up(KeyCode):
 # Numpad codes (unified between pygame and pyglet)
 # 0 1 2 3 4 5 6 7 8 9 add begin decimal delete divide down end enter equals
 # f1 f2 f3 f4 home insert left minus multiply next page down page up period plus
-# prior right separator space subtract tab up 
+# prior right separator space subtract tab up
diff --git a/ppb/scenes.py b/ppb/scenes.py
index cb2e61d3..0545f867 100644
--- a/ppb/scenes.py
+++ b/ppb/scenes.py
@@ -6,9 +6,7 @@
 from typing import Iterable
 from typing import Iterator
 from typing import Sequence
-from typing import Tuple
 from typing import Type
-from warnings import warn
 
 from ppb.abc import Scene
 from ppb.camera import Camera
@@ -32,7 +30,7 @@ def __iter__(self) -> Iterator[Hashable]:
     def __len__(self) -> int:
         return len(self.all)
 
-    def add(self, game_object: Hashable, tags: Iterable[Hashable]=()) -> None:
+    def add(self, game_object: Hashable, tags: Iterable[Hashable] = ()) -> None:
         """
         Add a game_object to the container.
 
@@ -46,7 +44,10 @@ def add(self, game_object: Hashable, tags: Iterable[Hashable]=()) -> None:
             container.add(MyObject(), tags=("red", "blue")
         """
         if isinstance(tags, (str, bytes)):
-            raise TypeError("You passed a string instead of an iterable, this probably isn't what you intended.\n\nTry making it a tuple.")
+            raise TypeError(
+                "You passed a string instead of an iterable, this probably isn't what you intended."
+                "\n\nTry making it a tuple.",
+            )
         self.all.add(game_object)
 
         for kind in type(game_object).mro():
@@ -54,7 +55,7 @@ def add(self, game_object: Hashable, tags: Iterable[Hashable]=()) -> None:
         for tag in tags:
             self.tags[tag].add(game_object)
 
-    def get(self, *, kind: Type=None, tag: Hashable=None, **_) -> Iterator:
+    def get(self, *, kind: Type = None, tag: Hashable = None, **_) -> Iterator:
         """
         Get an iterator of objects by kind or tag.
 
@@ -104,8 +105,8 @@ class BaseScene(Scene, EventMixin):
     background_color: Sequence[int] = (0, 0, 100)
     container_class: Type = GameObjectCollection
 
-    def __init__(self, engine, *,                 
-                 set_up: Callable=None, pixel_ratio: Number=64,
+    def __init__(self, engine, *,
+                 set_up: Callable = None, pixel_ratio: Number = 64,
                  **kwargs):
         super().__init__(engine)
         for k, v in kwargs.items():
@@ -141,7 +142,7 @@ def main_camera(self, value: Camera):
             self.game_objects.remove(camera)
         self.game_objects.add(value, tags=["main_camera"])
 
-    def add(self, game_object: Hashable, tags: Iterable=())-> None:
+    def add(self, game_object: Hashable, tags: Iterable = ()) -> None:
         """
         Add a game_object to the scene.
 
@@ -156,7 +157,7 @@ def add(self, game_object: Hashable, tags: Iterable=())-> None:
         """
         self.game_objects.add(game_object, tags)
 
-    def get(self, *, kind: Type=None, tag: Hashable=None, **kwargs) -> Iterator:
+    def get(self, *, kind: Type = None, tag: Hashable = None, **kwargs) -> Iterator:
         """
         Get an iterator of GameObjects by kind or tag.
 
diff --git a/ppb/sprites.py b/ppb/sprites.py
index 7653ece5..168ad516 100644
--- a/ppb/sprites.py
+++ b/ppb/sprites.py
@@ -2,12 +2,11 @@
 from pathlib import Path
 from typing import Union
 
+import ppb_vector
 from ppb import Vector
 from ppb.events import EventMixin
 from ppb.utils import FauxFloat
 
-import ppb_vector
-
 
 TOP = "top"
 BOTTOM = "bottom"
@@ -23,7 +22,7 @@ class Side(FauxFloat):
         LEFT: ('x', -1),
         RIGHT: ('x', 1),
         TOP: ('y', -1),
-        BOTTOM: ('y', 1)
+        BOTTOM: ('y', 1),
     }
 
     def __init__(self, parent: 'BaseSprite', side: str):
@@ -133,7 +132,7 @@ def _mk_update_vector_center(self, value):
 
         fields = {
             self_dimension: value[self_dimension] - self_offset,
-            attr_dimension: value[attr_dimension]
+            attr_dimension: value[attr_dimension],
         }
 
         return Vector(fields)
diff --git a/ppb/systems/__init__.py b/ppb/systems/__init__.py
index 926d86e8..8aaf03f3 100644
--- a/ppb/systems/__init__.py
+++ b/ppb/systems/__init__.py
@@ -21,12 +21,14 @@ def __exit__(self, exc_type, exc_val, exc_tb):
         pass
 
 
-from ppb.systems.pg import EventPoller as PygameEventPoller  # To not break old imports.
+# This import is here for backwards-compatibility reasons.
+from ppb.systems.pg import EventPoller as PygameEventPoller  # noqa: E402,F401,I202
 
 
 class Renderer(System):
 
-    def __init__(self, resolution=default_resolution, window_title: str="PursuedPyBear", target_frame_rate: int=30, **kwargs):
+    def __init__(self, resolution=default_resolution,
+                 window_title: str = "PursuedPyBear", target_frame_rate: int = 30, **kwargs):
         self.resolution = resolution
         self.resources = {}
         self.window = None
@@ -121,7 +123,7 @@ def resize_image(self, image, game_unit_size):
         # TODO: Pygame specific code To be abstracted somehow.
         key = (image, game_unit_size)
         resized_image = self.old_resized_images.get(key)
-        if  resized_image is None:
+        if resized_image is None:
             height = image.get_height()
             width = image.get_width()
             target_resolution = self.target_resolution(width,
@@ -162,6 +164,7 @@ def on_idle(self, idle_event: events.Idle, signal):
         self.accumulated_time += this_tick - self.last_tick
         self.last_tick = this_tick
         while self.accumulated_time >= self.time_step:
-            # This might need to change for the Idle event system to signal _only_ once per idle event.
+            # This might need to change for the Idle event system
+            # to signal _only_ once per idle event.
             self.accumulated_time += -self.time_step
             signal(events.Update(self.time_step))
diff --git a/ppb/systems/pg.py b/ppb/systems/pg.py
index e830613e..521928a7 100644
--- a/ppb/systems/pg.py
+++ b/ppb/systems/pg.py
@@ -3,11 +3,11 @@
 import pygame
 
 import ppb.buttons as buttons
-from ppb import Vector
 from ppb import events
 from ppb import keycodes as keys
-from ppb.systems import System  # TODO: Be aware of circular imports
+from ppb import Vector
 from ppb.systems import default_resolution
+from ppb.systems import System  # TODO: Be aware of circular imports
 
 
 class EventPoller(System):
@@ -130,7 +130,7 @@ class EventPoller(System):
         pygame.KMOD_LMETA: keys.SuperLeft,
         pygame.KMOD_RMETA: keys.SuperRight,
         pygame.KMOD_NUM: keys.NumLock,
-        pygame.KMOD_CAPS: keys.CapsLock
+        pygame.KMOD_CAPS: keys.CapsLock,
     }
 
     def __new__(cls, *args, **kwargs):
@@ -141,7 +141,7 @@ def __new__(cls, *args, **kwargs):
                 pygame.MOUSEBUTTONDOWN: "button_pressed",
                 pygame.MOUSEBUTTONUP: "button_released",
                 pygame.KEYDOWN: "key_pressed",
-                pygame.KEYUP: "key_released"
+                pygame.KEYUP: "key_released",
             }
         return super().__new__(cls)
 
@@ -170,9 +170,9 @@ def mouse_motion(self, event, scene):
         screen_position = Vector(*event.pos)
         camera = scene.main_camera
         scene_position = camera.translate_to_frame(screen_position)
-        delta = Vector(*event.rel) * (1/camera.pixel_ratio)
+        delta = Vector(*event.rel) * (1 / camera.pixel_ratio)
         buttons = {
-            self.button_map[btn+1]
+            self.button_map[btn + 1]
             for btn, value in enumerate(event.buttons)
             if value
         }
diff --git a/ppb/testutils.py b/ppb/testutils.py
index b36daade..5a633954 100644
--- a/ppb/testutils.py
+++ b/ppb/testutils.py
@@ -10,7 +10,7 @@
 class Failer(System):
 
     def __init__(self, *, fail: Callable[[GameEngine], bool], message: str,
-                 run_time: float=1, engine, **kwargs):
+                 run_time: float = 1, engine, **kwargs):
         super().__init__(**kwargs)
         self.fail = fail
         self.message = message
diff --git a/ppb/utils.py b/ppb/utils.py
index fc01952b..95e71651 100644
--- a/ppb/utils.py
+++ b/ppb/utils.py
@@ -1,9 +1,9 @@
 import logging
-import sys
-import numbers
 import math
+import numbers
+import sys
 
-__all__ = 'LoggingMixin', 'FauxFloat',
+__all__ = 'LoggingMixin', 'FauxFloat'
 
 
 # Dictionary mapping file names -> module names
diff --git a/tests/test_camera.py b/tests/test_camera.py
index b28bfec7..e14e29c4 100644
--- a/tests/test_camera.py
+++ b/tests/test_camera.py
@@ -52,7 +52,9 @@ def test_sprite_in_viewport():
     cam = Camera(viewport=(0, 0, 800, 600), pixel_ratio=80)
 
     class Thing(BaseSprite):
-        def __init__(self, position=Vector(2, 2)):
+        default_pos = Vector(2, 2)
+
+        def __init__(self, position=default_pos):
             super().__init__()
             self.size = 2
             self.position = position
diff --git a/tests/test_engine.py b/tests/test_engine.py
index bb74a417..acd8791a 100644
--- a/tests/test_engine.py
+++ b/tests/test_engine.py
@@ -4,8 +4,10 @@
 
 from pygame import Surface
 
-from ppb import GameEngine, BaseScene, Vector
+from ppb import BaseScene
 from ppb import events
+from ppb import GameEngine
+from ppb import Vector
 from ppb.systems import System
 from ppb.systems import Updater
 from ppb.testutils import Failer
@@ -37,6 +39,7 @@ def test_signal():
     engine.run()
     assert not engine.running
 
+
 def test_signal_once():
 
     engine = GameEngine(BaseScene, systems=[Quitter])
@@ -208,7 +211,8 @@ def on_scene_stopped(self, event, signal):
             assert event.scene is self
             test_function()
 
-    with GameEngine(TestScene, systems=[Updater, Failer], fail=lambda x: False, message="Will only time out.") as ge:
+    with GameEngine(TestScene, systems=[Updater, Failer],
+                    fail=lambda x: False, message="Will only time out.") as ge:
         ge.run()
 
     test_function.assert_called()
@@ -233,7 +237,6 @@ def test_event_extension():
     class TestEvent:
         pass
 
-
     class TestScene(BaseScene):
 
         def __init__(self, engine):
@@ -250,7 +253,8 @@ def on_test_event(self, event, signal):
         def event_extension(self, event):
             event.test_value = "Red"
 
-    with GameEngine(TestScene, systems=[Updater, Failer], message="Will only time out.", fail=lambda x: False) as ge:
+    with GameEngine(TestScene, systems=[Updater, Failer],
+                    message="Will only time out.", fail=lambda x: False) as ge:
         ge.run()
 
 
@@ -263,7 +267,6 @@ def all_extension(event):
     class TestEvent:
         pass
 
-
     class TestScene(BaseScene):
 
         def on_update(self, event, signal):
@@ -300,5 +303,6 @@ def on_idle(self, event: events.Idle, signal):
             was_called = True
             signal(events.Quit())
 
-    with GameEngine(BaseScene, systems=[TestSystem, Failer], fail=lambda x: False, message="Can only time out.") as ge:
+    with GameEngine(BaseScene, systems=[TestSystem, Failer],
+                    fail=lambda x: False, message="Can only time out.") as ge:
         ge.run()
diff --git a/tests/test_events.py b/tests/test_events.py
index 1b73e2a6..928269e4 100644
--- a/tests/test_events.py
+++ b/tests/test_events.py
@@ -20,7 +20,7 @@ def on_spam(self, bag, fire_event):
             passed_bag = bag
 
     bag = Spam()
-    fire_event = lambda: None
+    def fire_event(): return None
 
     e = Eventable()
 
@@ -34,11 +34,9 @@ def test_event_mixin_with_bad_signature():
     class BadSpam:
         pass
 
-
     class Spam:
         pass
 
-
     class Eventable(EventMixin):
         def on_spam(self, spam_event):
             pass
diff --git a/tests/test_fauxfloat.py b/tests/test_fauxfloat.py
index 001bfe1a..c649b382 100644
--- a/tests/test_fauxfloat.py
+++ b/tests/test_fauxfloat.py
@@ -2,12 +2,12 @@
 import operator
 import typing
 
-from ppb.utils import FauxFloat
-
 import pytest
+from hypothesis import assume
+from hypothesis import given
+from hypothesis import strategies as st
 
-from hypothesis import given, assume
-import hypothesis.strategies as st
+from ppb.utils import FauxFloat
 
 
 class RealFauxFloat(FauxFloat):
@@ -21,7 +21,6 @@ def __float__(self):
         return self.num
 
 
-
 # The use of pytest.mark.parametrize is prefered to st.sampled_from for
 # operators and datatypes for 2 reasons:
 # - It guarantees the parameter space is explored exhaustively.
diff --git a/tests/test_flags.py b/tests/test_flags.py
index d7677910..5152ad3d 100644
--- a/tests/test_flags.py
+++ b/tests/test_flags.py
@@ -1,5 +1,7 @@
 import inspect
+
 import pytest
+
 from ppb.flags import Flag
 
 
@@ -11,14 +13,18 @@ class TestFlag(Flag):
 
 
 def test_subclass():
-     class SpecialFlag(Flag, abstract=True): pass
-     class TestFlag(SpecialFlag): pass
+    class SpecialFlag(Flag, abstract=True):
+        pass
+
+    class TestFlag(SpecialFlag):
+        pass
 
-     assert isinstance(TestFlag, SpecialFlag)
+    assert isinstance(TestFlag, SpecialFlag)
 
 
 def test_instantiate():
-    class TestFlag(Flag): pass
+    class TestFlag(Flag):
+        pass
 
     with pytest.raises(TypeError):
         TestFlag()
@@ -28,18 +34,21 @@ class TestFlag(Flag): pass
 
 
 def test_abstract_instantiate():
-     class SpecialFlag(Flag, abstract=True): pass
+    class SpecialFlag(Flag, abstract=True):
+        pass
 
-     with pytest.raises(TypeError):
+    with pytest.raises(TypeError):
         SpecialFlag()
 
 
 def test_comparison():
-     class FlagA(Flag): pass
-     class FlagB(Flag): pass
+    class FlagA(Flag):
+        pass
 
-     assert FlagA is FlagA
-     assert FlagB is not FlagA
-     assert FlagA == FlagA
-     assert FlagB != FlagA
+    class FlagB(Flag):
+        pass
 
+    assert FlagA is FlagA
+    assert FlagB is not FlagA
+    assert FlagA == FlagA
+    assert FlagB != FlagA
diff --git a/tests/test_scenes.py b/tests/test_scenes.py
index e6454ac8..b33b0d33 100644
--- a/tests/test_scenes.py
+++ b/tests/test_scenes.py
@@ -4,8 +4,8 @@
 from pytest import mark
 from pytest import raises
 
-from ppb.scenes import BaseScene
 from ppb.camera import Camera
+from ppb.scenes import BaseScene
 from ppb.scenes import GameObjectCollection
 
 
diff --git a/tests/test_sprites.py b/tests/test_sprites.py
index da84761f..fb55644c 100644
--- a/tests/test_sprites.py
+++ b/tests/test_sprites.py
@@ -1,7 +1,8 @@
 from unittest import TestCase
 from unittest.mock import patch
 
-from ppb import BaseSprite, Vector
+from ppb import BaseSprite
+from ppb import Vector
 from ppb.sprites import Rotatable
 
 
diff --git a/tests/test_testutil.py b/tests/test_testutil.py
index f2e5f4bf..b2375e54 100644
--- a/tests/test_testutil.py
+++ b/tests/test_testutil.py
@@ -13,7 +13,7 @@
 def test_quitter(loop_count):
     quitter = testutil.Quitter(loop_count=loop_count)
     signal_mock = Mock()
-    for i in range(loop_count):
+    for _ in range(loop_count):
         quitter.__event__(Idle(.01), signal_mock)
     signal_mock.assert_called_once()
     assert len(signal_mock.call_args[0]) == 1
@@ -29,7 +29,8 @@ def test_failer_immediate():
 
 
 def test_failer_timed():
-    failer = testutil.Failer(fail=lambda e: False, message="Should time out", run_time=0.1, engine=None)
+    failer = testutil.Failer(fail=lambda e: False, message="Should time out",
+                             run_time=0.1, engine=None)
 
     start_time = monotonic()