diff --git a/librespot/ZeroconfServer.py b/librespot/ZeroconfServer.py
index 36590ba..d0ee0ad 100644
--- a/librespot/ZeroconfServer.py
+++ b/librespot/ZeroconfServer.py
@@ -16,8 +16,7 @@ class ZeroconfServer(Closeable):
     __keys: DiffieHellman
     __inner: ZeroconfServer.Inner
 
-    def __init__(self, inner: ZeroconfServer.Inner, listen_port: int,
-                 listen_all: bool):
+    def __init__(self, inner: ZeroconfServer.Inner, listen_port: int, listen_all: bool):
         self.__inner = inner
         self.__keys = DiffieHellman()
 
@@ -41,10 +40,16 @@ class ZeroconfServer(Closeable):
 
         def create(self) -> ZeroconfServer:
             return ZeroconfServer(
-                ZeroconfServer.Inner(self.device_type, self.device_name,
-                                     self.preferred_locale, self.conf,
-                                     self.device_id), self.__listenPort,
-                self.__listenAll)
+                ZeroconfServer.Inner(
+                    self.device_type,
+                    self.device_name,
+                    self.preferred_locale,
+                    self.conf,
+                    self.device_id,
+                ),
+                self.__listenPort,
+                self.__listenAll,
+            )
 
     class Inner:
         device_type: Connect.DeviceType = None
@@ -53,22 +58,26 @@ class ZeroconfServer(Closeable):
         preferred_locale: str = None
         conf = None
 
-        def __init__(self,
-                     device_type: Connect.DeviceType,
-                     device_name: str,
-                     preferred_locale: str,
-                     conf: Session.Configuration,
-                     device_id: str = None):
+        def __init__(
+            self,
+            device_type: Connect.DeviceType,
+            device_name: str,
+            preferred_locale: str,
+            conf: Session.Configuration,
+            device_id: str = None,
+        ):
             self.preferred_locale = preferred_locale
             self.conf = conf
             self.device_type = device_type
             self.device_name = device_name
-            self.device_id = device_id if device_id is not None else Utils.random_hex_string(
-                40)
+            self.device_id = (
+                device_id if device_id is not None else Utils.random_hex_string(40)
+            )
 
     class HttpRunner(Runnable, Closeable):
         __sock: socket
-        __executorService: concurrent.futures.ThreadPoolExecutor = concurrent.futures.ThreadPoolExecutor(
+        __executorService: concurrent.futures.ThreadPoolExecutor = (
+            concurrent.futures.ThreadPoolExecutor()
         )
         __shouldStop: bool = False