app.py

import streamlit as st
import pandas as pd

st.set_page_config(page_title="Hello Streamlit", layout="wide")
st.title("Hello, Streamlit ")
st.write("Turn notebooks into shareable apps in minutes.")
# A tiny dataset
sales = pd.DataFrame({
"month": ["Jan","Feb","Mar","Apr"],
"revenue": [120, 150, 130, 180]
})

# Widget + computed view
threshold = st.slider("Highlight revenue above", 100, 200, 140)
st.bar_chart(sales.set_index("month"))
st.write("Rows above threshold:")
st.dataframe(sales[sales.revenue > threshold])