format with Black
diff --git a/examples/battery_client.py b/examples/battery_client.py
index f545f12..9f8641e 100644
--- a/examples/battery_client.py
+++ b/examples/battery_client.py
@@ -55,7 +55,9 @@
             # Subscribe to and read the battery level
             if battery_service.battery_level:
                 await battery_service.battery_level.subscribe(
-                    lambda value: print(f'{color("Battery Level Update:", "green")} {value}')
+                    lambda value: print(
+                        f'{color("Battery Level Update:", "green")} {value}'
+                    )
                 )
                 value = await battery_service.battery_level.read_value()
                 print(f'{color("Initial Battery Level:", "green")} {value}')
@@ -64,5 +66,5 @@
 
 
 # -----------------------------------------------------------------------------
-logging.basicConfig(level = os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper())
+logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper())
 asyncio.run(main())