fix python example (#4141)

content/en/docs/languages/python/getting-started.md

@@ -58,16 +58,18 @@ app = Flask(__name__)
 logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger(__name__)
 
+
 @app.route("/rolldice")
 def roll_dice():
-    player = request.args.get('player', default = None, type = str)
+    player = request.args.get('player', default=None, type=str)
     result = str(roll())
     if player:
-        logger.warn("%s is rolling the dice: %s", player, result)
+        logger.warning("%s is rolling the dice: %s", player, result)
     else:
-        logger.warn("Anonymous player is rolling the dice: %s", result)
+        logger.warning("Anonymous player is rolling the dice: %s", result)
     return result
 
+
 def roll():
     return randint(1, 6)
 ```