diff --git a/mopidy_raspberry_gpio/__init__.py b/mopidy_raspberry_gpio/__init__.py
index 93bea71..859f10a 100644
--- a/mopidy_raspberry_gpio/__init__.py
+++ b/mopidy_raspberry_gpio/__init__.py
@@ -4,7 +4,6 @@ import pathlib
 from mopidy import config, ext
 
 from .pinconfig import PinConfig
-from .rotencoder import RotEncoder
 
 __version__ = "0.0.2"
 
diff --git a/mopidy_raspberry_gpio/frontend.py b/mopidy_raspberry_gpio/frontend.py
index 93475fc..215b9c3 100644
--- a/mopidy_raspberry_gpio/frontend.py
+++ b/mopidy_raspberry_gpio/frontend.py
@@ -7,6 +7,7 @@ from .rotencoder import RotEncoder
 
 logger = logging.getLogger(__name__)
 
+
 class RaspberryGPIOFrontend(pykka.ThreadingActor, core.CoreListener):
     def __init__(self, config, core):
         super().__init__()
@@ -35,9 +36,9 @@ class RaspberryGPIOFrontend(pykka.ThreadingActor, core.CoreListener):
                     pull = GPIO.PUD_DOWN
                     edge = GPIO.RISING
 
-                if 'rotenc_id' in settings.options:
+                if "rotenc_id" in settings.options:
                     edge = GPIO.BOTH
-                    rotenc_id = settings.options['rotenc_id']
+                    rotenc_id = settings.options["rotenc_id"]
                     encoder = None
                     if rotenc_id in self.rot_encoders.keys():
                         encoder = self.rot_encoders[rotenc_id]
@@ -67,7 +68,7 @@ class RaspberryGPIOFrontend(pykka.ThreadingActor, core.CoreListener):
     def gpio_event(self, pin):
         settings = self.pin_settings[pin]
         event = settings.event
-        encoder = self.find_pin_rotenc (pin)
+        encoder = self.find_pin_rotenc(pin)
         if encoder:
             event = encoder.get_event()
 
diff --git a/tests/test_frontend.py b/tests/test_frontend.py
index 0d7db26..568fbe7 100644
--- a/tests/test_frontend.py
+++ b/tests/test_frontend.py
@@ -216,8 +216,8 @@ def test_frontend_rot_encoder_event(patched_input):
     frontend.dispatch_input = dispatch_input
 
     frontend.gpio_event(4)
-    assert (dispatch_input.call_args[0][0] == "volume_up")
-    assert (encoder.state == (False, False))
+    assert dispatch_input.call_args[0][0] == "volume_up"
+    assert encoder.state == (False, False)
 
     # Check that we do not submit an event for the invalid transition
     # (False, False) -> (False, False)