diff --git a/bumblebee/engine.py b/bumblebee/engine.py
index ee94186..98964e0 100644
--- a/bumblebee/engine.py
+++ b/bumblebee/engine.py
@@ -39,7 +39,7 @@ class Module(object):
         self.id = self.name
 
         self._configFile = None
-        for cfg in [ os.path.expanduser("~/.bumblebee-status.conf"), os.path.expanduser("~/.config/bumblebee-status.conf") ]:
+        for cfg in [os.path.expanduser("~/.bumblebee-status.conf"), os.path.expanduser("~/.config/bumblebee-status.conf")]:
             if os.path.exists(cfg):
                 self._configFile = RawConfigParser()
                 self._configFile.read(cfg)
@@ -138,11 +138,11 @@ class Engine(object):
 
     def _register_module_callbacks(self, module):
         buttons = [
-            { "name": "left-click", "id": bumblebee.input.LEFT_MOUSE },
-            { "name": "middle-click", "id": bumblebee.input.MIDDLE_MOUSE },
-            { "name": "right-click", "id": bumblebee.input.RIGHT_MOUSE },
-            { "name": "wheel-up", "id": bumblebee.input.WHEEL_UP },
-            { "name": "wheel-down", "id": bumblebee.input.WHEEL_DOWN },
+            {"name": "left-click", "id": bumblebee.input.LEFT_MOUSE},
+            {"name": "middle-click", "id": bumblebee.input.MIDDLE_MOUSE},
+            {"name": "right-click", "id": bumblebee.input.RIGHT_MOUSE},
+            {"name": "wheel-up", "id": bumblebee.input.WHEEL_UP},
+            {"name": "wheel-down", "id": bumblebee.input.WHEEL_DOWN},
         ]
         for button in buttons:
             if module.parameter(button["name"], None):
diff --git a/bumblebee/input.py b/bumblebee/input.py
index ebe11b2..cb8c28a 100644
--- a/bumblebee/input.py
+++ b/bumblebee/input.py
@@ -137,6 +137,6 @@ class I3BarInput(object):
         except Exception:
             # fall back to global default
             if not "__fallback" in event:
-                return self.callback({ "name": None, "instance": None, "__fallback": True, "button": event["button"] })
+                return self.callback({"name": None, "instance": None, "__fallback": True, "button": event["button"]})
 
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
diff --git a/bumblebee/modules/amixer.py b/bumblebee/modules/amixer.py
index 2ac6c89..55d6878 100644
--- a/bumblebee/modules/amixer.py
+++ b/bumblebee/modules/amixer.py
@@ -38,5 +38,5 @@ class Module(bumblebee.engine.Module):
 
     def state(self, widget):
         if self._muted:
-            return [ "warning", "muted" ]
-        return [ "unmuted" ]
+            return ["warning", "muted"]
+        return ["unmuted"]
diff --git a/bumblebee/modules/battery.py b/bumblebee/modules/battery.py
index 61741ed..7638d3f 100644
--- a/bumblebee/modules/battery.py
+++ b/bumblebee/modules/battery.py
@@ -30,9 +30,9 @@ class Module(bumblebee.engine.Module):
         if self._batteries[0] == "auto":
             self._batteries = glob.glob("/sys/class/power_supply/BAT*")
         else:
-            self._batteries = [ "/sys/class/power_supply/{}".format(b) for b in self._batteries ]
+            self._batteries = ["/sys/class/power_supply/{}".format(b) for b in self._batteries]
         if len(self._batteries) == 0:
-            self._batteries = [ "/sys/class/power_supply/BAT0" ]
+            self._batteries = ["/sys/class/power_supply/BAT0"]
         self.update(widgets)
         engine.input.register_callback(self, button=bumblebee.input.LEFT_MOUSE,
             cmd="gnome-power-statistics")
@@ -108,7 +108,7 @@ class Module(bumblebee.engine.Module):
             with open("{}/status".format(widget.name)) as f:
                 charge = f.read().strip()
             if charge == "Discharging":
-                state.append("discharging-{}".format(min([10, 25, 50, 80, 100] , key=lambda i:abs(i-capacity))))
+                state.append("discharging-{}".format(min([10, 25, 50, 80, 100], key=lambda i: abs(i-capacity))))
             else:
                 if capacity > 95:
                     state.append("charged")
diff --git a/bumblebee/modules/brightness.py b/bumblebee/modules/brightness.py
index e61be7e..29ba4e3 100644
--- a/bumblebee/modules/brightness.py
+++ b/bumblebee/modules/brightness.py
@@ -39,7 +39,7 @@ class Module(bumblebee.engine.Module):
                 backlight = int(f.readline())
             with open("{}/max_brightness".format(self._device_path)) as f:
                 max_brightness = int(f.readline())
-                self._brightness=float(backlight*100/max_brightness)
+                self._brightness = float(backlight*100/max_brightness)
         except:
             return "Error"
 
diff --git a/bumblebee/modules/cmus.py b/bumblebee/modules/cmus.py
index 2db4c0c..de638e4 100644
--- a/bumblebee/modules/cmus.py
+++ b/bumblebee/modules/cmus.py
@@ -68,7 +68,7 @@ class Module(bumblebee.engine.Module):
         return returns.get(widget.name, self._status)
 
     def _eval_line(self, line):
-        name, key, value  = (line.split(" ", 2) + [None, None])[:3]
+        name, key, value = (line.split(" ", 2) + [None, None])[:3]
 
         if name == "status":
             self._status = key
diff --git a/bumblebee/modules/datetime.py b/bumblebee/modules/datetime.py
index b116ee9..fe380b4 100644
--- a/bumblebee/modules/datetime.py
+++ b/bumblebee/modules/datetime.py
@@ -16,7 +16,7 @@ import datetime
 import locale
 import bumblebee.engine
 
-ALIASES = [ "date", "time" ]
+ALIASES = ["date", "time"]
 
 def default_format(module):
     default = "%x %X"
diff --git a/bumblebee/modules/disk.py b/bumblebee/modules/disk.py
index a9b7888..db4d522 100644
--- a/bumblebee/modules/disk.py
+++ b/bumblebee/modules/disk.py
@@ -50,11 +50,11 @@ class Module(bumblebee.engine.Module):
         spercent = self.has_parameter("showPercent")
 
         if all(not param for param in (sused, ssize, spercent)):
-            return self._format.format(path = self._path,
-                                       used = used_str,
-                                       left = left_str,
-                                       size = size_str,
-                                       percent = percent_str)
+            return self._format.format(path=self._path,
+                                       used=used_str,
+                                       left=left_str,
+                                       size=size_str,
+                                       percent=percent_str)
         else:
             rv = ""
             sused = bumblebee.util.asbool(self.parameter("showUsed", True))
diff --git a/bumblebee/modules/getcrypto.py b/bumblebee/modules/getcrypto.py
index 0884463..502e100 100644
--- a/bumblebee/modules/getcrypto.py
+++ b/bumblebee/modules/getcrypto.py
@@ -20,7 +20,7 @@ import bumblebee.input
 import bumblebee.output
 import bumblebee.engine
 from requests.exceptions import RequestException
-def getfromkrak(coin,currency):
+def getfromkrak(coin, currency):
     abbrev = {
         "Btc": ["xbt", "XXBTZ"],
         "Eth": ["eth", "XETHZ"],
@@ -63,11 +63,11 @@ class Module(bumblebee.engine.Module):
             currency = self._getcur
             btcprice, ethprice, ltcprice = "", "", ""
             if self._getbtc:
-                btcprice= getfromkrak('Btc',currency)
+                btcprice = getfromkrak('Btc', currency)
             if self._geteth:
-                ethprice=getfromkrak('Eth',currency)
+                ethprice = getfromkrak('Eth', currency)
             if self._getltc:
-                ltcprice=getfromkrak('Ltc',currency)
+                ltcprice = getfromkrak('Ltc', currency)
             self._curprice = btcprice+" "*(self._getbtc*self._geteth)+ethprice+" "*(self._getltc*max(self._getbtc, self._geteth))+ltcprice
 
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
diff --git a/bumblebee/modules/mocp.py b/bumblebee/modules/mocp.py
index 5c203b2..7ffe263 100644
--- a/bumblebee/modules/mocp.py
+++ b/bumblebee/modules/mocp.py
@@ -35,7 +35,7 @@ class Module(bumblebee.engine.Module):
     #@scrollable
     def description(self, widget):
         if self._running == 1:
-            display =  self._status + ": " + self._artist + " - " +  self._title + " | " + self._position + "/" + self._duration
+            display = self._status + ": " + self._artist + " - " +  self._title + " | " + self._position + "/" + self._duration
         else:
             display = "Music On Console Player"
         return display
@@ -53,7 +53,7 @@ class Module(bumblebee.engine.Module):
                     self._artist = line.split(": ", 2)[1]
                 if line.startswith("Title:"):
                     self._title = line.split(": ", 2)[1]
-                    self._title = self._title.split("(by ",2)[0]
+                    self._title = self._title.split("(by ", 2)[0]
                 if line.startswith("CurrentTime:"):
                     self._position = line.split(": ", 2)[1]
                 if line.startswith("TotalTime:"):
diff --git a/bumblebee/modules/mpd.py b/bumblebee/modules/mpd.py
index af90581..9a9f253 100644
--- a/bumblebee/modules/mpd.py
+++ b/bumblebee/modules/mpd.py
@@ -106,6 +106,6 @@ class Module(bumblebee.engine.Module):
                         self._shuffle = False
             if line.startswith("tag"):
                 key, value = line.split(" ", 2)[1:]
-                self._tags.update({ key: value })
+                self._tags.update({key: value})
 
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
diff --git a/bumblebee/modules/nic.py b/bumblebee/modules/nic.py
index 01a251f..28ffc69 100644
--- a/bumblebee/modules/nic.py
+++ b/bumblebee/modules/nic.py
@@ -72,7 +72,7 @@ class Module(bumblebee.engine.Module):
         return retval
 
     def _update_widgets(self, widgets):
-        interfaces = [ i for i in netifaces.interfaces() if not i.startswith(self._exclude) ]
+        interfaces = [i for i in netifaces.interfaces() if not i.startswith(self._exclude)]
 
         for widget in widgets:
             widget.set("visited", False)
diff --git a/bumblebee/modules/nvidiagpu.py b/bumblebee/modules/nvidiagpu.py
index 42f1972..8acf68c 100644
--- a/bumblebee/modules/nvidiagpu.py
+++ b/bumblebee/modules/nvidiagpu.py
@@ -11,14 +11,14 @@ import bumblebee.output
 import bumblebee.engine
 
 class Module(bumblebee.engine.Module):
-    def __init__(self,engine,config):
-        super(Module,self).__init__(engine,config,bumblebee.output.Widget(full_text=self.utilization))
+    def __init__(self, engine, config):
+        super(Module, self).__init__(engine, config, bumblebee.output.Widget(full_text=self.utilization))
         self._utilization = "Not found: 0 0/0"
 
-    def utilization(self,widget):
+    def utilization(self, widget):
         return self._utilization
 
-    def update(self,widgets):
+    def update(self, widgets):
         sp = subprocess.Popen(['nvidia-smi', '-q'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
         out_str = sp.communicate()
         out_list = out_str[0].decode("utf-8").split('\n')
@@ -43,4 +43,4 @@ class Module(bumblebee.engine.Module):
                     name = val
             except:
                 title = item.strip()
-        self._utilization = u"%s: %s°C %s/%s"%(name,temp,usedMem,totalMem)
+        self._utilization = u"%s: %s°C %s/%s"%(name, temp, usedMem, totalMem)
diff --git a/bumblebee/modules/pacman.py b/bumblebee/modules/pacman.py
index 81941e1..44f0c9c 100644
--- a/bumblebee/modules/pacman.py
+++ b/bumblebee/modules/pacman.py
@@ -47,12 +47,12 @@ class Module(bumblebee.engine.Module):
         self._count = 0
 
     def updates(self, widget):
-        return '/'.join(map(lambda x: str(widget.get(x,0)), repos))
+        return '/'.join(map(lambda x: str(widget.get(x, 0)), repos))
 
     def update(self, widgets):
         path = os.path.dirname(os.path.abspath(__file__))
         if self._count == 0:
-            thread = threading.Thread(target=get_pacman_info, args=(widgets[0],path))
+            thread = threading.Thread(target=get_pacman_info, args=(widgets[0], path))
             thread.start()
  
         # TODO: improve this waiting mechanism a bit
@@ -60,7 +60,7 @@ class Module(bumblebee.engine.Module):
         self._count = 0 if self._count > 300 else self._count
 
     def state(self, widget):
-        weightedCount = sum(map(lambda x: (len(repos)-x[0]) * widget.get(x[1],0), enumerate(repos)))
+        weightedCount = sum(map(lambda x: (len(repos)-x[0]) * widget.get(x[1], 0), enumerate(repos)))
 
         if weightedCount < 10:
             return "good"
diff --git a/bumblebee/modules/ping.py b/bumblebee/modules/ping.py
index e19d603..0a1419b 100644
--- a/bumblebee/modules/ping.py
+++ b/bumblebee/modules/ping.py
@@ -30,10 +30,10 @@ def get_rtt(module, widget):
         ))
 
         for line in res.split("\n"):
-            if line.startswith( "{} packets transmitted".format( widget.get( "rtt-probes" ) ) ):
-                m = re.search( r'(\d+)% packet loss', line )
+            if line.startswith("{} packets transmitted".format(widget.get("rtt-probes"))):
+                m = re.search(r'(\d+)% packet loss', line)
 
-                widget.set( 'packet-loss', m.group(1) )
+                widget.set('packet-loss', m.group(1))
 
             if not line.startswith("rtt"): continue
             m = re.search(r'([0-9\.]+)/([0-9\.]+)/([0-9\.]+)/([0-9\.]+)\s+(\S+)', line)
@@ -67,7 +67,7 @@ class Module(bumblebee.engine.Module):
             widget.get("address"),
             widget.get("rtt-avg"),
             widget.get("rtt-unit"),
-            widget.get( 'packet-loss' )
+            widget.get('packet-loss')
         )
 
     def state(self, widget):
@@ -77,7 +77,7 @@ class Module(bumblebee.engine.Module):
     def update(self, widgets):
         if int(time.time()) < self._next_check:
             return
-        thread = threading.Thread(target=get_rtt, args=(self,widgets[0],))
+        thread = threading.Thread(target=get_rtt, args=(self, widgets[0],))
         thread.start()
         self._next_check = int(time.time()) + int(widgets[0].get("interval"))
 
diff --git a/bumblebee/modules/pulseaudio.py b/bumblebee/modules/pulseaudio.py
index 5e60d55..d74f4f6 100644
--- a/bumblebee/modules/pulseaudio.py
+++ b/bumblebee/modules/pulseaudio.py
@@ -18,7 +18,7 @@ import bumblebee.input
 import bumblebee.output
 import bumblebee.engine
 
-ALIASES = [ "pasink", "pasource" ]
+ALIASES = ["pasink", "pasource"]
 
 class Module(bumblebee.engine.Module):
     def __init__(self, engine, config):
@@ -38,17 +38,17 @@ class Module(bumblebee.engine.Module):
         channel = "sink" if self.name == "pasink" else "source"
 
         self._patterns = [
-            { "expr": "name:", "callback": (lambda line: False) },
-            { "expr": "muted:", "callback": (lambda line: self.mute(False if " no" in line.lower() else True)) },
-            { "expr": "volume:", "callback": self.getvolume },
+            {"expr": "name:", "callback": (lambda line: False)},
+            {"expr": "muted:", "callback": (lambda line: self.mute(False if " no" in line.lower() else True))},
+            {"expr": "volume:", "callback": self.getvolume},
         ]
 
         engine.input.register_callback(self, button=bumblebee.input.RIGHT_MOUSE, cmd="pavucontrol")
 
         events = [
-            { "type": "mute", "action": "toggle", "button": bumblebee.input.LEFT_MOUSE },
-            { "type": "volume", "action": "+2%", "button": bumblebee.input.WHEEL_UP },
-            { "type": "volume", "action": "-2%", "button": bumblebee.input.WHEEL_DOWN },
+            {"type": "mute", "action": "toggle", "button": bumblebee.input.LEFT_MOUSE},
+            {"type": "volume", "action": "+2%", "button": bumblebee.input.WHEEL_UP},
+            {"type": "volume", "action": "-2%", "button": bumblebee.input.WHEEL_DOWN},
         ]
 
         for event in events:
@@ -120,7 +120,7 @@ class Module(bumblebee.engine.Module):
 
     def state(self, widget):
         if self._mute:
-            return [ "warning", "muted" ]
-        return [ "unmuted" ]
+            return ["warning", "muted"]
+        return ["unmuted"]
 
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
diff --git a/bumblebee/modules/sensors.py b/bumblebee/modules/sensors.py
index 2772dff..ed518f5 100644
--- a/bumblebee/modules/sensors.py
+++ b/bumblebee/modules/sensors.py
@@ -46,14 +46,14 @@ class Module(bumblebee.engine.Module):
             log.debug("retrieved temperature from 'sensors -u'")
         return temperature
 
-    def get_mhz( self ):
+    def get_mhz(self):
         try:
             output = open("/sys/devices/system/cpu/cpufreq/policy0/scaling_cur_freq").read()
             mhz = int(float(output)/1000.0)
         except:
             output = open("/proc/cpuinfo").read()
-            m      = re.search(r"cpu MHz\s+:\s+(\d+)", output)
-            mhz    = int(m.group(1))
+            m = re.search(r"cpu MHz\s+:\s+(\d+)", output)
+            mhz = int(m.group(1))
 
         if mhz < 1000:
             return "{} MHz".format(mhz)
diff --git a/bumblebee/modules/spotify.py b/bumblebee/modules/spotify.py
index 9ed47aa..0c62543 100644
--- a/bumblebee/modules/spotify.py
+++ b/bumblebee/modules/spotify.py
@@ -28,7 +28,7 @@ class Module(bumblebee.engine.Module):
         self._song = ""
         self._format = self.parameter("format", "{artist} - {title}")
 
-        cmd="dbus-send --session --type=method_call --dest=org.mpris.MediaPlayer2.spotify \
+        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=bumblebee.input.LEFT_MOUSE,
             cmd=cmd + "Previous")
diff --git a/bumblebee/modules/test.py b/bumblebee/modules/test.py
index e4099c6..b654575 100644
--- a/bumblebee/modules/test.py
+++ b/bumblebee/modules/test.py
@@ -5,7 +5,7 @@
 
 import bumblebee.engine
 
-ALIASES = [ "test-alias" ]
+ALIASES = ["test-alias"]
 
 class Module(bumblebee.engine.Module):
     def __init__(self, engine, config):
diff --git a/bumblebee/modules/todo.py b/bumblebee/modules/todo.py
index d96388f..1151c77 100644
--- a/bumblebee/modules/todo.py
+++ b/bumblebee/modules/todo.py
@@ -29,7 +29,7 @@ class Module(bumblebee.engine.Module):
 
     
     def state(self, widgets):
-        if self._todos == 0 :
+        if self._todos == 0:
             return "empty"
         return "items"
         
diff --git a/bumblebee/modules/traffic.py b/bumblebee/modules/traffic.py
index 60d5dd7..5b49a21 100644
--- a/bumblebee/modules/traffic.py
+++ b/bumblebee/modules/traffic.py
@@ -67,7 +67,7 @@ class Module(bumblebee.engine.Module):
         return retval
 
     def _update_widgets(self, widgets):
-        interfaces = [ i for i in netifaces.interfaces() if not i.startswith(self._exclude) ]
+        interfaces = [i for i in netifaces.interfaces() if not i.startswith(self._exclude)]
 
         del widgets[:]
 
diff --git a/bumblebee/modules/weather.py b/bumblebee/modules/weather.py
index 66334dd..1bad080 100644
--- a/bumblebee/modules/weather.py
+++ b/bumblebee/modules/weather.py
@@ -60,22 +60,22 @@ class Module(bumblebee.engine.Module):
             return u"?"
         return self.city() + self.temperature()
 
-    def state( self, widget ):
+    def state(self, widget):
         if self._valid:
             if "thunderstorm" in self._weather:
-                return [ 'thunder' ]
+                return ['thunder']
             elif "drizzle" in self._weather:
-                return [ 'rain' ]
+                return ['rain']
             elif "rain" in self._weather:
-                return [ 'rain' ]
+                return ['rain']
             elif "snow" in self._weather:
-                return [ 'snow' ]
+                return ['snow']
             elif "sleet" in self._weather:
-                return [ 'sleet' ]
+                return ['sleet']
             elif "clear" in self._weather:
-                return [ 'clear' ]
+                return ['clear']
             elif "cloud" in self._weather:
-                return [ 'clouds' ]
+                return ['clouds']
             else:
                 return []
 
diff --git a/bumblebee/util.py b/bumblebee/util.py
index 11119f8..c81d64b 100644
--- a/bumblebee/util.py
+++ b/bumblebee/util.py
@@ -40,7 +40,7 @@ def execute(cmd, wait=True):
     return rv
 
 def bytefmt(num):
-    for unit in [ "", "Ki", "Mi", "Gi" ]:
+    for unit in ["", "Ki", "Mi", "Gi"]:
         if num < 1024.0:
             return "{:.2f}{}B".format(num, unit)
         num /= 1024.0