diff --git a/modules/core/xrandr.py b/modules/core/xrandr.py
index b9e5cd7..d7b23d3 100644
--- a/modules/core/xrandr.py
+++ b/modules/core/xrandr.py
@@ -1,11 +1,11 @@
 # pylint: disable=C0111,R0903
 
-"""Shows a widget for each connected screen and allows the user to enable/disable screens.
+'''Shows a widget for each connected screen and allows the user to enable/disable screens.
 
 Parameters:
     * xrandr.overwrite_i3config: If set to 'true', this module assembles a new i3 config
-        every time a screen is enabled or disabled by taking the file "~/.config/i3/config.template"
-        and appending a file "~/.config/i3/config.<screen name>" for every screen.
+        every time a screen is enabled or disabled by taking the file '~/.config/i3/config.template'
+        and appending a file '~/.config/i3/config.<screen name>' for every screen.
     * xrandr.autoupdate: If set to 'false', does *not* invoke xrandr automatically. Instead, the
         module will only refresh when displays are enabled or disabled (defaults to true)
 
@@ -14,7 +14,7 @@ Requires the following python module:
 
 Requires the following executable:
     * xrandr
-"""
+'''
 
 import os
 import re
@@ -35,11 +35,11 @@ class Module(bumblebee.engine.Module):
         widgets = []
         self._engine = engine
         super(Module, self).__init__(engine, config, widgets)
-        self._autoupdate = bumblebee.util.asbool(self.parameter("autoupdate", True))
+        self._autoupdate = bumblebee.util.asbool(self.parameter('autoupdate', True))
         self._needs_update = True
 
         try:
-            i3.Subscription(self._output_update, "output")
+            i3.Subscription(self._output_update, 'output')
         except:
             pass
 
@@ -54,10 +54,10 @@ class Module(bumblebee.engine.Module):
 
         self._needs_update = False
 
-        for line in bumblebee.util.execute("xrandr -q").split("\n"):
-            if not " connected" in line:
+        for line in bumblebee.util.execute('xrandr -q').split('\n'):
+            if not ' connected' in line:
                 continue
-            display = line.split(" ", 2)[0]
+            display = line.split(' ', 2)[0]
             m = re.search(r'\d+x\d+\+(\d+)\+\d+', line)
 
             widget = self.widget(display)
@@ -66,8 +66,8 @@ class Module(bumblebee.engine.Module):
                 self._engine.input.register_callback(widget, button=1, cmd=self._toggle)
                 self._engine.input.register_callback(widget, button=3, cmd=self._toggle)
             new_widgets.append(widget)
-            widget.set("state", "on" if m else "off")
-            widget.set("pos", int(m.group(1)) if m else sys.maxsize)
+            widget.set('state', 'on' if m else 'off')
+            widget.set('pos', int(m.group(1)) if m else sys.maxsize)
 
         while len(widgets) > 0:
             del widgets[0]
@@ -75,8 +75,8 @@ class Module(bumblebee.engine.Module):
             widgets.append(widget)
 
         if self._autoupdate == False:
-            widget = bumblebee.output.Widget(full_text="")
-            widget.set("state", "refresh")
+            widget = bumblebee.output.Widget(full_text='')
+            widget.set('state', 'refresh')
             self._engine.input.register_callback(widget, button=1, cmd=self._refresh)
             widgets.append(widget)
 
@@ -84,7 +84,7 @@ class Module(bumblebee.engine.Module):
         self.update_widgets(widgets)
 
     def state(self, widget):
-        return widget.get("state", "off")
+        return widget.get('state', 'off')
 
     def _refresh(self, event):
         self._needs_update = True
@@ -93,26 +93,26 @@ class Module(bumblebee.engine.Module):
         self._needs_update = True
         path = os.path.dirname(os.path.abspath(__file__))
 
-        if bumblebee.util.asbool(self.parameter("overwrite_i3config", False)) == True:
-            toggle_cmd = "{}/../../bin/toggle-display.sh".format(path)
+        if bumblebee.util.asbool(self.parameter('overwrite_i3config', False)) == True:
+            toggle_cmd = '{}/../../bin/toggle-display.sh'.format(path)
         else:
-            toggle_cmd = "xrandr"
+            toggle_cmd = 'xrandr'
 
-        widget = self.widget_by_id(event["instance"])
+        widget = self.widget_by_id(event['instance'])
 
-        if widget.get("state") == "on":
-            bumblebee.util.execute("{} --output {} --off".format(toggle_cmd, widget.name))
+        if widget.get('state') == 'on':
+            bumblebee.util.execute('{} --output {} --off'.format(toggle_cmd, widget.name))
         else:
-            first_neighbor = next((widget for widget in self.widgets() if widget.get("state") == "on"), None)
-            last_neighbor = next((widget for widget in reversed(self.widgets()) if widget.get("state") == "on"), None)
+            first_neighbor = next((widget for widget in self.widgets() if widget.get('state') == 'on'), None)
+            last_neighbor = next((widget for widget in reversed(self.widgets()) if widget.get('state') == 'on'), None)
 
-            neighbor = first_neighbor if event["button"] == bumblebee.input.LEFT_MOUSE else last_neighbor
+            neighbor = first_neighbor if event['button'] == bumblebee.input.LEFT_MOUSE else last_neighbor
 
             if neighbor is None:
-                bumblebee.util.execute("{} --output {} --auto".format(toggle_cmd, widget.name))
+                bumblebee.util.execute('{} --output {} --auto'.format(toggle_cmd, widget.name))
             else:
-                bumblebee.util.execute("{} --output {} --auto --{}-of {}".format(toggle_cmd, widget.name,
-                    "left" if event.get("button") == bumblebee.input.LEFT_MOUSE else "right",
+                bumblebee.util.execute('{} --output {} --auto --{}-of {}'.format(toggle_cmd, widget.name,
+                    'left' if event.get('button') == bumblebee.input.LEFT_MOUSE else 'right',
                     neighbor.name))
 
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4