diff --git a/icingabot.py b/icingabot.py
index e449797..cb55d6e 100755
--- a/icingabot.py
+++ b/icingabot.py
@@ -107,7 +107,12 @@ class Icinga2ServiceManager:
             "X-HTTP-Method-Override": "GET",
         }
         data = {
-            "attrs": ["last_check_result", "display_name", "host_name", "acknowledgement"],
+            "attrs": [
+                "last_check_result",
+                "display_name",
+                "host_name",
+                "acknowledgement",
+            ],
             "filter": "service.state!=ServiceOK",
         }
         try:
@@ -119,9 +124,7 @@ class Icinga2ServiceManager:
                 verify=settings["icinga2ca"],
             )
             if r.status_code == 200:
-                new_ko_services = [
-                    n for n in r.json()["results"] if n is not None
-                ]
+                new_ko_services = [n for n in r.json()["results"] if n is not None]
                 news = [
                     n
                     for n in new_ko_services
@@ -143,10 +146,7 @@ class Icinga2ServiceManager:
             "Accept": "application/json",
             "X-HTTP-Method-Override": "POST",
         }
-        params = {
-            "type": "Service",
-            "filter": "service.state!=ServiceOK"
-        }
+        params = {"type": "Service", "filter": "service.state!=ServiceOK"}
         if pattern:
             params['filter'] += '&& match("*{}*", service.__name)'.format(pattern)
         try:
@@ -167,7 +167,7 @@ class Icinga2ServiceManager:
     def ack_service(self, pattern, comment, nick):
         data = {
             "author": nick,
-            "comment": comment or " ", # never "" !
+            "comment": comment or " ",  # never "" !
         }
         self.post_on_services(pattern, '/v1/actions/acknowledge-problem', data)
 
@@ -234,10 +234,7 @@ class IcingaBot(Icinga2ServiceManager, irc.bot.SingleServerIRCBot):
             self.do_command(e, e.arguments[0][1:])
             return
         a = e.arguments[0].split(":", 1)
-        if (
-            len(a) > 1
-            and a[0].lower() == self.connection.get_nickname().lower()
-        ):
+        if len(a) > 1 and a[0].lower() == self.connection.get_nickname().lower():
             self.do_command(e, a[1].strip())
         return
 
@@ -280,7 +277,8 @@ class IcingaBot(Icinga2ServiceManager, irc.bot.SingleServerIRCBot):
         return [
             (group, [service["attrs"]["host_name"] for service in services])
             for group, services in groupby(
-                sorted(self.get_unack_ko_services(), key=regroup_key), regroup_key
+                sorted(self.get_unack_ko_services(), key=regroup_key),
+                regroup_key,
             )
         ]
 
@@ -302,12 +300,14 @@ class IcingaBot(Icinga2ServiceManager, irc.bot.SingleServerIRCBot):
                     ]
                 )
             )
-            acknowledged = [s for s in self.ko_services if s["attrs"]["acknowledgement"]]
+            acknowledged = [
+                s for s in self.ko_services if s["attrs"]["acknowledgement"]
+            ]
             if acknowledged:
                 self.send(
                     "Acknowledged ({}): {}".format(
                         len(acknowledged),
-                        ', '.join({s["attrs"]["display_name"] for s in acknowledged})
+                        ', '.join({s["attrs"]["display_name"] for s in acknowledged}),
                     )
                 )
         else:
@@ -315,9 +315,7 @@ class IcingaBot(Icinga2ServiceManager, irc.bot.SingleServerIRCBot):
 
     def do_ack(self, c, e):
         if self.args is None:
-            self.send(
-                e.source.nick + ": usage: !ack <pattern or all> [: comment]"
-            )
+            self.send(e.source.nick + ": usage: !ack <pattern or all> [: comment]")
             return
         tokens = self.args.split(":", 1)
         pattern, comment = tokens[0].strip(), ""