diff --git a/modules/contrib/bluetooth.py b/modules/contrib/bluetooth.py
index fc5d5b5..f10d6cc 100644
--- a/modules/contrib/bluetooth.py
+++ b/modules/contrib/bluetooth.py
@@ -30,17 +30,17 @@ class Module(bumblebee.engine.Module):
                                      bumblebee.output.Widget(
                                          full_text=self.status))
 
-        device = self.parameter("device", "hci0")
-        self.manager = self.parameter("manager", "blueman-manager")
-        self._path = "/sys/class/bluetooth/{}".format(device)
-        self._status = "Off"
+        device = self.parameter('device', 'hci0')
+        self.manager = self.parameter('manager', 'blueman-manager')
+        self._path = '/sys/class/bluetooth/{}'.format(device)
+        self._status = 'Off'
 
         engine.input.register_callback(self, button=bumblebee.input.LEFT_MOUSE,
                                        cmd=self.manager)
 
         # determine whether to use pop-up menu or simply toggle the device on/off
         right_click_popup = bumblebee.util.asbool(
-            self.parameter("right_click_popup", True))
+            self.parameter('right_click_popup', True))
 
         if right_click_popup:
             engine.input.register_callback(self,
@@ -58,27 +58,27 @@ class Module(bumblebee.engine.Module):
     def update(self, widgets):
         """Update current state."""
         if not os.path.exists(self._path):
-            self._status = "?"
+            self._status = '?'
             return
 
         # search for whichever rfkill directory available
         try:
             dirnames = next(os.walk(self._path))[1]
             for dirname in dirnames:
-                m = re.match(r"rfkill[0-9]+", dirname)
+                m = re.match(r'rfkill[0-9]+', dirname)
                 if m is not None:
                     with open(os.path.join(self._path,
                                            dirname,
                                            'state'), 'r') as f:
                         state = int(f.read())
                         if state == 1:
-                            self._status = "On"
+                            self._status = 'On'
                         else:
-                            self._status = "Off"
+                            self._status = 'Off'
                     return
 
         except IOError:
-            self._status = "?"
+            self._status = '?'
 
     def manager(self, widget):
         """Launch manager."""
@@ -87,9 +87,9 @@ class Module(bumblebee.engine.Module):
     def popup(self, widget):
         """Show a popup menu."""
         menu = bumblebee.popup.PopupMenu()
-        if self._status == "On":
+        if self._status == 'On':
             menu.add_menuitem('Disable Bluetooth')
-        elif self._status == "Off":
+        elif self._status == 'Off':
             menu.add_menuitem('Enable Bluetooth')
         else:
             return
@@ -102,17 +102,17 @@ class Module(bumblebee.engine.Module):
 
     def _toggle(self, widget=None):
         """Toggle bluetooth state."""
-        if self._status == "On":
-            state = "false"
+        if self._status == 'On':
+            state = 'false'
         else:
-            state = "true"
+            state = 'true'
 
-        dst = self.parameter("dbus_destination", "org.blueman.Mechanism")
-        dst_path = self.parameter("dbus_destination_path", "/")
+        dst = self.parameter('dbus_destination', 'org.blueman.Mechanism')
+        dst_path = self.parameter('dbus_destination_path', '/')
 
-        cmd = "dbus-send --system --print-reply --dest={}"\
-              " {} org.blueman.Mechanism.SetRfkillState"\
-              " boolean:{}".format(dst, dst_path, state)
+        cmd = 'dbus-send --system --print-reply --dest={}'\
+              ' {} org.blueman.Mechanism.SetRfkillState'\
+              ' boolean:{}'.format(dst, dst_path, state)
 
         logging.debug('bt: toggling bluetooth')
         bumblebee.util.execute(cmd)
@@ -121,11 +121,11 @@ class Module(bumblebee.engine.Module):
         """Get current state."""
         state = []
 
-        if self._status == "?":
-            state = ["unknown"]
-        elif self._status == "On":
-            state = ["ON"]
+        if self._status == '?':
+            state = ['unknown']
+        elif self._status == 'On':
+            state = ['ON']
         else:
-            state = ["OFF"]
+            state = ['OFF']
 
         return state