fix logging formatting

diff --git a/examples/ddns_server.py b/examples/ddns_server.py
index c69c99469a7f7143b24de3cd9de16f0d23c7abad..4bd99b14a904747030beb341952317e9b8d7d672 100644 (file)
--- a/examples/ddns_server.py
+++ b/examples/ddns_server.py
@@ -76,7 +76,7 @@ async def main():
     port = 8053
 
     logging.basicConfig(level=logging.INFO)
-    logging.info("Starting servers at {hostname}:{port}")
+    logging.info(f"Starting servers at {hostname}:{port}")
     loop = asyncio.get_event_loop()
 
     # Start UDP server