Update app.py

app.py

@@ -1,13 +1,14 @@
 # Import modules
 import streamlit as st
 import pymongo
+from pymongo.server_api import ServerApi
 import os
 
 # Connect to MongoDB database
 # client = pymongo.MongoClient("mongodb://localhost:27017/")
 # db = client["todo_db"]
 
-uri = os.environ["mongo_uri"]
+uri = environ.get("mongo_uri", None)
 # Create a new client and connect to the server
 client = pymongo.MongoClient(uri, server_api=ServerApi('1'))
 db = client["todo_db"]