Update app.py

app.py

@@ -14,7 +14,8 @@ import ee
 credentials = ee.ServiceAccountCredentials(os.environ.get("SERVICE_EMAIL"), key_data=os.environ.get("SERVICE_JSON"))
 
 import math
-from shiny import App, render, ui, reactive, Inputs, Outputs, Session
+from typing import Optional
+from shiny import App, render, ui, reactive, Inputs, Outputs, Session, req
 import ipyleaflet as L
 from htmltools import css
 import numpy as np