Update app.py

app.py

@@ -3,6 +3,7 @@ import pandas as pd
 import plotly.express as px
 import altair as alt
 import folium
+from streamlit_plotly_events import plotly_events # added for part3 interactivity
 from folium.plugins import HeatMap, MarkerCluster
 from streamlit_folium import st_folium