Update app.py

app.py

@@ -7,9 +7,9 @@ from langfuse.decorators import observe, langfuse_context
 from langfuse.openai import openai, OpenAI
 
 # set Langfuse api keys and host address
-"LANGFUSE_PUBLIC_KEY" = os.getenv('LANGFUSE_PUBLIC_KEY')
-"LANGFUSE_SECRET_KEY" = os.getenv('LANGFUSE_SECRET_KEY')
-"LANGFUSE_HOST" = os.getenv('LANGFUSE_HOST')
+LANGFUSE_PUBLIC_KEY = os.getenv('LANGFUSE_PUBLIC_KEY')
+LANGFUSE_SECRET_KEY = os.getenv('LANGFUSE_SECRET_KEY')
+LANGFUSE_HOST = os.getenv('LANGFUSE_HOST')
 
 # initialize the client but point it to TGI
 client = OpenAI(