diff --git a/modules/contrib/pomodoro.py b/modules/contrib/pomodoro.py
index 7103dc1..4e23d37 100644
--- a/modules/contrib/pomodoro.py
+++ b/modules/contrib/pomodoro.py
@@ -7,10 +7,10 @@ Right click will cancel the timer.
 Parameters:
     * pomodoro.work: The work duration of timer in minutes (defaults to 25)
     * pomodoro.break: The break duration of timer in minutes (defaults to 5)
-    * pomodoro.format: Timer display format with "%m" and "%s" for minutes and seconds (defaults to "%m:%s")
-                       Examples: "%m min %s sec", "%mm", "", "timer"
+    * pomodoro.format: Timer display format with '%m' and '%s' for minutes and seconds (defaults to '%m:%s')
+                       Examples: '%m min %s sec', '%mm', '', 'timer'
     * pomodoro.notify: Notification command to run when timer ends/starts (defaults to nothing)
-                       Example: 'notify-send "Time up!"'. If you want to chain multiple commands,
+                       Example: 'notify-send 'Time up!''. If you want to chain multiple commands,
                        please use an external wrapper script and invoke that. The module itself does
                        not support command chaining (see https://github.com/tobi-wan-kenobi/bumblebee-status/issues/532
                        for a detailled explanation)
@@ -31,24 +31,24 @@ class Module(bumblebee.engine.Module):
         super(Module, self).__init__(engine, config, widgets)
 
         # Parameters
-        self._work_period = int(self.parameter("work", 25))
-        self._break_period = int(self.parameter("break", 5))
-        self._time_format = self.parameter("format", "%m:%s")
-        self._notify_cmd = self.parameter("notify", "")
+        self._work_period = int(self.parameter('work', 25))
+        self._break_period = int(self.parameter('break', 5))
+        self._time_format = self.parameter('format', '%m:%s')
+        self._notify_cmd = self.parameter('notify', '')
 
         # TODO: Handle time formats more gracefully. This is kludge.
         self.display_seconds_p = False
         self.display_minutes_p = False
-        if "%s" in self._time_format:
+        if '%s' in self._time_format:
             self.display_seconds_p = True
-        if "%m" in self._time_format:
+        if '%m' in self._time_format:
             self.display_minutes_p = True
 
         self.remaining_time = datetime.timedelta(minutes=self._work_period)
 
         self.time = None
-        self.pomodoro = { "state":"OFF", "type": ""}
-        self._text = self.remaining_time_str() + self.pomodoro["type"]
+        self.pomodoro = { 'state':'OFF', 'type': ''}
+        self._text = self.remaining_time_str() + self.pomodoro['type']
 
         engine.input.register_callback(self, button=bumblebee.input.LEFT_MOUSE,
                                        cmd=self.timer_play_pause)
@@ -66,15 +66,15 @@ class Module(bumblebee.engine.Module):
             minutes = 0
             seconds = self.remaining_time.seconds
 
-        minutes = "{:2d}".format(minutes)
-        seconds = "{:02d}".format(seconds)
-        return self._time_format.replace("%m",minutes).replace("%s",seconds)+" "
+        minutes = '{:2d}'.format(minutes)
+        seconds = '{:02d}'.format(seconds)
+        return self._time_format.replace('%m',minutes).replace('%s',seconds)+' '
 
     def text(self, widget):
-        return "{}".format(self._text) 
+        return '{}'.format(self._text) 
         
     def update(self, widget):
-        if self.pomodoro["state"] == "ON":
+        if self.pomodoro['state'] == 'ON':
             timediff = (datetime.datetime.now() - self.time)
             if timediff.seconds >= 0:
                 self.remaining_time -= timediff
@@ -82,41 +82,41 @@ class Module(bumblebee.engine.Module):
 
             if self.remaining_time.total_seconds() <= 0:
                 self.notify()
-                if self.pomodoro["type"] == "Work":
-                    self.pomodoro["type"] = "Break"
+                if self.pomodoro['type'] == 'Work':
+                    self.pomodoro['type'] = 'Break'
                     self.remaining_time = datetime.timedelta(minutes=self._break_period)
-                elif self.pomodoro["type"] == "Break":
-                    self.pomodoro["type"] = "Work"
+                elif self.pomodoro['type'] == 'Break':
+                    self.pomodoro['type'] = 'Work'
                     self.remaining_time = datetime.timedelta(minutes=self._work_period)
 
-        self._text = self.remaining_time_str() + self.pomodoro["type"]
+        self._text = self.remaining_time_str() + self.pomodoro['type']
     
     def notify(self):
         if self._notify_cmd:
             bumblebee.util.execute(self._notify_cmd)
 
     def timer_play_pause(self, widget):
-        if self.pomodoro["state"] == "OFF":
-            self.pomodoro = {"state": "ON", "type": "Work"}
+        if self.pomodoro['state'] == 'OFF':
+            self.pomodoro = {'state': 'ON', 'type': 'Work'}
             self.remaining_time = datetime.timedelta(minutes=self._work_period)
             self.time = datetime.datetime.now()
-        elif self.pomodoro["state"] == "ON":
-            self.pomodoro["state"] = "PAUSED"
+        elif self.pomodoro['state'] == 'ON':
+            self.pomodoro['state'] = 'PAUSED'
             self.remaining_time -= (datetime.datetime.now() - self.time)
             self.time = datetime.datetime.now()
-        elif self.pomodoro["state"] == "PAUSED":
-            self.pomodoro["state"] = "ON"
+        elif self.pomodoro['state'] == 'PAUSED':
+            self.pomodoro['state'] = 'ON'
             self.time = datetime.datetime.now()
 
     def timer_reset(self, widget):
-        if self.pomodoro["state"] == "ON" or self.pomodoro["state"] == "PAUSED":
-            self.pomodoro = {"state":"OFF", "type": "" }
+        if self.pomodoro['state'] == 'ON' or self.pomodoro['state'] == 'PAUSED':
+            self.pomodoro = {'state':'OFF', 'type': '' }
             self.remaining_time = datetime.timedelta(minutes=self._work_period)
 
     def state(self, widget):
         state = [];
-        state.append(self.pomodoro["state"].lower())
-        if self.pomodoro["state"] == "ON" or self.pomodoro["state"] == "OFF":
-            state.append(self.pomodoro["type"].lower())
+        state.append(self.pomodoro['state'].lower())
+        if self.pomodoro['state'] == 'ON' or self.pomodoro['state'] == 'OFF':
+            state.append(self.pomodoro['type'].lower())
 
         return state