Update src/streamlit_app.py

src/streamlit_app.py

@@ -229,6 +229,14 @@ line_chart = alt.Chart(filtered_crimes).mark_line(point=True).encode(
 line_chart
 
 ### Use this one!!!
+# Load geojson file.
+gdf_counties = gpd.read_file("County_Boundary.geojson")
+    
+# Creat dropdown menu.
+year_dropdown = ipywidgets.Dropdown(
+    options= sorted(df['year'].unique()),
+    description='Year:')
+    
 # Identify top 10 crime types
 top_10_crimes = df['crm_cd_desc'].value_counts().nlargest(10).index.tolist()