diff --git a/mopidy_raspberry_gpio/__init__.py b/mopidy_raspberry_gpio/__init__.py
index f449cb7..99adcb6 100644
--- a/mopidy_raspberry_gpio/__init__.py
+++ b/mopidy_raspberry_gpio/__init__.py
@@ -29,4 +29,5 @@ class Extension(ext.Extension):
 
     def setup(self, registry):
         from .frontend import RaspberryGPIOFrontend
+
         registry.add("frontend", RaspberryGPIOFrontend)
diff --git a/mopidy_raspberry_gpio/frontend.py b/mopidy_raspberry_gpio/frontend.py
index 2be9e50..fb730fd 100644
--- a/mopidy_raspberry_gpio/frontend.py
+++ b/mopidy_raspberry_gpio/frontend.py
@@ -12,6 +12,7 @@ class RaspberryGPIOFrontend(pykka.ThreadingActor, core.CoreListener):
     def __init__(self, config, core):
         super().__init__()
         import RPi.GPIO as GPIO
+
         self.core = core
         self.config = config["raspberry-gpio"]
         self.pin_settings = {}
@@ -30,20 +31,18 @@ class RaspberryGPIOFrontend(pykka.ThreadingActor, core.CoreListener):
 
                 pull = GPIO.PUD_UP
                 edge = GPIO.FALLING
-                if settings.active == 'active_high':
+                if settings.active == "active_high":
                     pull = GPIO.PUD_DOWN
                     edge = GPIO.RISING
 
-                GPIO.setup(
-                    pin,
-                    GPIO.IN,
-                    pull_up_down=pull)
+                GPIO.setup(pin, GPIO.IN, pull_up_down=pull)
 
                 GPIO.add_event_detect(
                     pin,
                     edge,
                     callback=self.gpio_event,
-                    bouncetime=settings.bouncetime)
+                    bouncetime=settings.bouncetime,
+                )
 
                 self.pin_settings[pin] = settings
 
diff --git a/mopidy_raspberry_gpio/pinconfig.py b/mopidy_raspberry_gpio/pinconfig.py
index 9e59ebc..9ed9e9c 100644
--- a/mopidy_raspberry_gpio/pinconfig.py
+++ b/mopidy_raspberry_gpio/pinconfig.py
@@ -4,8 +4,7 @@ from mopidy import config
 
 
 class PinConfig(config.ConfigValue):
-    tuple_pinconfig = namedtuple("PinConfig",
-                                 ("event", "active", "bouncetime"))
+    tuple_pinconfig = namedtuple("PinConfig", ("event", "active", "bouncetime"))
 
     valid_events = "play_pause", "prev", "next", "volume_up", "volume_down"
 
@@ -21,7 +20,7 @@ class PinConfig(config.ConfigValue):
         value = config.decode(value).strip()
 
         try:
-            event, active, bouncetime = value.split(',')
+            event, active, bouncetime = value.split(",")
         except ValueError:
             return None
 
@@ -52,5 +51,6 @@ class PinConfig(config.ConfigValue):
         if value is None:
             return ""
         value = "{:s},{:s},{:d}".format(
-            value.event, value.active, value.bouncetime)
+            value.event, value.active, value.bouncetime
+        )
         return config.encode(value)
diff --git a/setup.py b/setup.py
index fc1f76c..6068493 100644
--- a/setup.py
+++ b/setup.py
@@ -1,3 +1,3 @@
 from setuptools import setup
 
-setup()
\ No newline at end of file
+setup()
diff --git a/tests/test_frontend.py b/tests/test_frontend.py
index f3a1f3f..8133fcb 100644
--- a/tests/test_frontend.py
+++ b/tests/test_frontend.py
@@ -19,8 +19,8 @@ dummy_config = {
 
 
 def test_get_frontend_classes():
-    sys.modules['RPi'] = mock.Mock()
-    sys.modules['RPi.GPIO'] = mock.Mock()
+    sys.modules["RPi"] = mock.Mock()
+    sys.modules["RPi.GPIO"] = mock.Mock()
 
     ext = Extension()
     registry = mock.Mock()
@@ -28,14 +28,15 @@ def test_get_frontend_classes():
     ext.setup(registry)
 
     registry.add.assert_called_once_with(
-        'frontend', frontend_lib.RaspberryGPIOFrontend)
+        "frontend", frontend_lib.RaspberryGPIOFrontend
+    )
 
 
 def test_frontend_handler_dispatch():
-    sys.modules['RPi'] = mock.Mock()
-    sys.modules['RPi.GPIO'] = mock.Mock()
+    sys.modules["RPi"] = mock.Mock()
+    sys.modules["RPi.GPIO"] = mock.Mock()
 
     frontend = frontend_lib.RaspberryGPIOFrontend(dummy_config, mock.Mock())
 
     with pytest.raises(RuntimeError):
-        frontend.dispatch_input('tomato')
+        frontend.dispatch_input("tomato")