Update app.py

app.py

@@ -41,6 +41,10 @@ digraph G2 {
 }
 ''')
 
+
+
+st.title('Graphviz Dot Language: https://graphviz.org/doc/info/lang.html')
+
 # Using graph language:
 st.graphviz_chart(''' 
 digraph G {
@@ -108,7 +112,7 @@ digraph R {
 
 
 # pydeck example
-
+st.title('Pydeck Example: https://docs.streamlit.io/library/api-reference/charts/st.pydeck_chart')
 df = pd.DataFrame(
     np.random.randn(1000, 2) / [50, 50] + [44.9366, -93.6661],
     columns=['lat', 'lon'])
@@ -143,6 +147,20 @@ st.pydeck_chart(pdk.Deck(
      ],
  ))
 
+st.title('Vega Lite Example: https://docs.streamlit.io/library/api-reference/charts/st.vega_lite_chart ')
+df = pd.DataFrame(
+     np.random.randn(200, 3),
+     columns=['a', 'b', 'c'])
+
+st.vega_lite_chart(df, {
+     'mark': {'type': 'circle', 'tooltip': True},
+     'encoding': {
+         'x': {'field': 'a', 'type': 'quantitative'},
+         'y': {'field': 'b', 'type': 'quantitative'},
+         'size': {'field': 'c', 'type': 'quantitative'},
+         'color': {'field': 'c', 'type': 'quantitative'},
+     },
+ })
 
 # More graph examples