Create app.py

app.py

@@ -0,0 +1,13 @@
+import streamlit as st
+import pandas as pd
+import numpy as np
+import altair as alt
+
+chart_data = pd.DataFrame(
+    np.random.randn(20, 3),
+    columns=['a', 'b', 'c'])
+
+c = alt.Chart(chart_data).mark_circle().encode(
+    x='a', y='b', size='c', color='c', tooltip=['a', 'b', 'c'])
+
+st.altair_chart(c, use_container_width=True)