diff --git a/GlobalRRD.py b/GlobalRRD.py
index b3cf31a..9c09549 100644
--- a/GlobalRRD.py
+++ b/GlobalRRD.py
@@ -23,8 +23,9 @@ class GlobalRRD(RRD):
         super().__init__(os.path.join(directory, "nodes.rrd"))
         self.ensure_sanity(self.ds_list, self.rra_list, step=60)
 
-    def update(self, nodeCount, clientCount):
-        super().update({'nodes': nodeCount, 'clients': clientCount})
+    # TODO: fix this, python does not support function overloading
+    def update(self, node_count, client_count):
+        super().update({'nodes': node_count, 'clients': client_count})
 
     def graph(self, filename, timeframe):
         args = ["rrdtool", 'graph', filename,
diff --git a/alfred.py b/alfred.py
index 720b946..2ab0117 100644
--- a/alfred.py
+++ b/alfred.py
@@ -3,7 +3,8 @@ import json
 
 
 def _fetch(data_type):
-    output = subprocess.check_output(["alfred-json", "-z", "-f", "json", "-r", str(data_type)])
+    output = subprocess.check_output(
+        ["alfred-json", "-z", "-f", "json", "-r", str(data_type)])
     return json.loads(output.decode("utf-8")).values()
 
 
@@ -26,8 +27,9 @@ def aliases():
 
         try:
             # TODO: better pass lat, lng as a tuple?
-            node_alias['gps'] = "{lat}\x20{lng}".format(lat=node['location']['latitude'],
-                                                        lng=node['location']['longitude'])
+            node_alias['gps'] = "{lat}\x20{lng}".\
+                format(lat=node['location']['latitude'],
+                       lng=node['location']['longitude'])
         except KeyError:
             pass
 
diff --git a/backend.py b/backend.py
index ff943ec..7b7d0e5 100755
--- a/backend.py
+++ b/backend.py
@@ -38,16 +38,20 @@ def main(params):
     for node_id, node in nodedb['nodes'].items():
         node['flags']['online'] = False
 
-    nodes.import_nodeinfo(nodedb['nodes'], alfred.nodeinfo(), now, assume_online=True)
+    nodes.import_nodeinfo(nodedb['nodes'], alfred.nodeinfo(),
+                          now, assume_online=True)
 
     for aliases in params['aliases']:
         with open(aliases, 'r') as f:
-            nodes.import_nodeinfo(nodedb['nodes'], json.load(f), now, assume_online=False)
+            nodes.import_nodeinfo(nodedb['nodes'], json.load(f),
+                                  now, assume_online=False)
 
     nodes.reset_statistics(nodedb['nodes'])
     nodes.import_statistics(nodedb['nodes'], alfred.statistics())
 
-    bm = list(map(lambda d: (d.vis_data(True), d.gateway_list()), map(Batman, params['mesh'])))
+    bm = list(map(lambda d:
+                  (d.vis_data(True), d.gateway_list()),
+                  map(Batman, params['mesh'])))
     for vis_data, gateway_list in bm:
         nodes.import_mesh_ifs_vis_data(nodedb['nodes'], vis_data)
         nodes.import_vis_clientcount(nodedb['nodes'], vis_data)
@@ -74,7 +78,8 @@ def main(params):
         json.dump({'batadv': json_graph.node_link_data(batadv_graph)}, f)
 
     scriptdir = os.path.dirname(os.path.realpath(__file__))
-    rrd = RRD(scriptdir + '/nodedb/', params['destination_directory'] + '/nodes')
+    rrd = RRD("{}/nodedb/".format(scriptdir),
+              "{}/nodes".format(params['destination_directory']))
     rrd.update_database(nodedb['nodes'])
     rrd.update_images()
 
diff --git a/batman.py b/batman.py
index 86ad4fe..ddd0bd5 100644
--- a/batman.py
+++ b/batman.py
@@ -30,30 +30,37 @@ class Batman(object):
 
     def vis_data_batctl_legacy(self):
         """
-        Parse "batctl -m <mesh_interface> vd json -n" into an array of dictionaries.
+        Parse "batctl -m <mesh_interface> vd json -n"
+        into an array of dictionaries.
         """
-        output = subprocess.check_output(['batctl', '-m', self.mesh_interface, 'vd', 'json', '-n'])
+        output = subprocess.check_output(
+            ['batctl', '-m', self.mesh_interface, 'vd', 'json', '-n'])
         lines = output.splitlines()
         vds = self.vis_data_helper(lines)
         return vds
 
     def vis_data_batadv_vis(self):
         """
-        Parse "batadv-vis -i <mesh_interface> -f json" into an array of dictionaries.
+        Parse "batadv-vis -i <mesh_interface> -f json"
+        into an array of dictionaries.
         """
-        output = subprocess.check_output(['batadv-vis', '-i', self.mesh_interface, '-f', 'json'])
+        output = subprocess.check_output(
+            ['batadv-vis', '-i', self.mesh_interface, '-f', 'json'])
         lines = output.splitlines()
         return self.vis_data_helper(lines)
 
     def gateway_list(self):
         """
-        Parse "batctl -m <mesh_interface> gwl -n" into an array of dictionaries.
+        Parse "batctl -m <mesh_interface> gwl -n"
+        into an array of dictionaries.
         """
-        output = subprocess.check_output(['batctl', '-m', self.mesh_interface, 'gwl', '-n'])
+        output = subprocess.check_output(
+            ['batctl', '-m', self.mesh_interface, 'gwl', '-n'])
         output_utf8 = output.decode('utf-8')
         lines = output_utf8.splitlines()
 
-        own_mac = re.match(r"^.*MainIF/MAC: [^/]+/([0-9a-f:]+).*$", lines[0]).group(1)
+        own_mac = re.match(r"^.*MainIF/MAC: [^/]+/([0-9a-f:]+).*$",
+                           lines[0]).group(1)
 
         gateways = []
         gw_mode = self.gateway_mode()
@@ -71,7 +78,8 @@ class Batman(object):
         """
         Parse "batctl -m <mesh_interface> gw"
         """
-        output = subprocess.check_output(['batctl', '-m', self.mesh_interface, 'gw'])
+        output = subprocess.check_output(
+            ['batctl', '-m', self.mesh_interface, 'gw'])
         elements = output.decode("utf-8").split()
         mode = elements[0]
         if mode == 'server':