Code Editor for app.py

import streamlit as st
import pandas as pd
import numpy as np

st.title("Simple Streamlit App")

# Add a header
st.header("Welcome to Streamlit!")

# Add some text
st.write("This is a basic Streamlit application that demonstrates some core features.")

# Create a sidebar
st.sidebar.header("Controls")
option = st.sidebar.selectbox(
    "Choose a visualization:",
    ["Data Table", "Chart", "Interactive Widget"]
)

# Generate some sample data
data = pd.DataFrame({
    'Category': ['A', 'B', 'C', 'D', 'E'],
    'Values': np.random.randint(1, 100, 5)
})

# Display content based on sidebar selection
if option == "Data Table":
    st.subheader("Sample Data Table")
    st.table(data)
    
elif option == "Chart":
    st.subheader("Sample Bar Chart")
    st.bar_chart(data.set_index('Category'))
    
elif option == "Interactive Widget":
    st.subheader("Interactive Slider")
    slider_val = st.slider("Select a value", 0, 100, 50)
    st.write(f"You selected: {slider_val}")
    
    if slider_val > 75:
        st.success("That's a high value!")
    elif slider_val < 25:
        st.error("That's a low value!")
    else:
        st.info("That's a middle value!")

# Add a button to trigger an action
if st.button("Click me!"):
    st.balloons()
    st.write("Thanks for clicking!")

# Add a checkbox for additional content
show_extra = st.checkbox("Show extra content")
if show_extra:
    st.subheader("Extra Content")
    st.write("This content only appears when the checkbox is checked.")
    
    # Create columns for layout
    col1, col2 = st.columns(2)
    with col1:
        st.write("This is column 1")
        st.metric(label="Temperature", value="70 °F", delta="1.2 °F")
    with col2:
        st.write("This is column 2")
        st.metric(label="Humidity", value="45%", delta="-5%")

# Footer
st.markdown("---")
st.caption("Created with Streamlit")