Update app.py

app.py

@@ -21,7 +21,7 @@ from langchain.agents import Tool, initialize_agent
 from huggingface_hub import login
 
 # Check if the token is already set in the environment variables
-hf_token = os.environ(["HF_TOKEN"])
+hf_token = os.getenv("HF_TOKEN")
 
 if hf_token is None:
     # If the token is not set, prompt for it (this should be done securely)