diff --git a/modules/contrib/spotify.py b/modules/contrib/spotify.py
index abc12bd..b7fa14e 100644
--- a/modules/contrib/spotify.py
+++ b/modules/contrib/spotify.py
@@ -4,7 +4,7 @@
 Requires the following library:
     * python-dbus
 Parameters:
-    * spotify.format:   Format string (defaults to "{artist} - {title}")
+    * spotify.format:   Format string (defaults to '{artist} - {title}')
                         Available values are: {album}, {title}, {artist}, {trackNumber}, {playbackStatus}
     * spotify.previous: Change binding for previous song (default is left click)
     * spotify.next:     Change binding for next song (default is right click)
@@ -32,39 +32,39 @@ class Module(bumblebee.engine.Module):
         super(Module, self).__init__(engine, config,
                                      bumblebee.output.Widget(full_text=self.spotify)
                                      )
-        buttons = {"LEFT_CLICK":bumblebee.input.LEFT_MOUSE,
-                   "RIGHT_CLICK":bumblebee.input.RIGHT_MOUSE,
-                   "MIDDLE_CLICK":bumblebee.input.MIDDLE_MOUSE,
-                   "SCROLL_UP":bumblebee.input.WHEEL_UP,
-                   "SCROLL_DOWN":bumblebee.input.WHEEL_DOWN,
+        buttons = {'LEFT_CLICK':bumblebee.input.LEFT_MOUSE,
+                   'RIGHT_CLICK':bumblebee.input.RIGHT_MOUSE,
+                   'MIDDLE_CLICK':bumblebee.input.MIDDLE_MOUSE,
+                   'SCROLL_UP':bumblebee.input.WHEEL_UP,
+                   'SCROLL_DOWN':bumblebee.input.WHEEL_DOWN,
                    }
         
-        self._song = ""
-        self._format = self.parameter("format", "{artist} - {title}")
-        prev_button = self.parameter("previous", "LEFT_CLICK")
-        next_button = self.parameter("next", "RIGHT_CLICK")
-        pause_button = self.parameter("pause", "MIDDLE_CLICK")
+        self._song = ''
+        self._format = self.parameter('format', '{artist} - {title}')
+        prev_button = self.parameter('previous', 'LEFT_CLICK')
+        next_button = self.parameter('next', 'RIGHT_CLICK')
+        pause_button = self.parameter('pause', 'MIDDLE_CLICK')
 
-        cmd = "dbus-send --session --type=method_call --dest=org.mpris.MediaPlayer2.spotify \
-                /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player."
+        cmd = 'dbus-send --session --type=method_call --dest=org.mpris.MediaPlayer2.spotify \
+                /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.'
         engine.input.register_callback(self, button=buttons[prev_button],
-            cmd=cmd + "Previous")
+            cmd=cmd + 'Previous')
         engine.input.register_callback(self, button=buttons[next_button],
-            cmd=cmd + "Next")
+            cmd=cmd + 'Next')
         engine.input.register_callback(self, button=buttons[pause_button],
-            cmd=cmd + "PlayPause")
+            cmd=cmd + 'PlayPause')
 
     @scrollable
     def spotify(self, widget):
         return self.string_song
 
     def hidden(self):
-        return self.string_song == ""
+        return self.string_song == ''
 
     def update(self, widgets):
         try:
             bus = dbus.SessionBus()
-            spotify = bus.get_object("org.mpris.MediaPlayer2.spotify", "/org/mpris/MediaPlayer2")
+            spotify = bus.get_object('org.mpris.MediaPlayer2.spotify', '/org/mpris/MediaPlayer2')
             spotify_iface = dbus.Interface(spotify, 'org.freedesktop.DBus.Properties')
             props = spotify_iface.Get('org.mpris.MediaPlayer2.Player', 'Metadata')
             playback_status = str(spotify_iface.Get('org.mpris.MediaPlayer2.Player', 'PlaybackStatus'))
@@ -72,10 +72,10 @@ class Module(bumblebee.engine.Module):
                                              title=str(props.get('xesam:title')),
                                              artist=','.join(props.get('xesam:artist')),
                                              trackNumber=str(props.get('xesam:trackNumber')),
-                                             playbackStatus=u"\u25B6" if playback_status=="Playing" else u"\u258D\u258D" if playback_status=="Paused" else "",)
+                                             playbackStatus=u'\u25B6' if playback_status=='Playing' else u'\u258D\u258D' if playback_status=='Paused' else '',)
             
         except Exception:
-            self._song = ""
+            self._song = ''
 
     @property
     def string_song(self):