Code Editor for app.py

import streamlit as st
import pandas as pd
import requests
import time

# Configure the page to use wide layout
st.set_page_config(
    page_title="Realtime Dashboard",
    layout="wide"
)

st.title("Realtime Data Dashboard")

# Function to fetch data from API
def fetch_data():
    # Using a sample API that provides crypto prices
    # NOTE: Using corsproxy.io because we're in a WASM environment. If running locally,
    # you can remove the corsproxy.io prefix.
    url = "https://corsproxy.io/?https://api.coingecko.com/api/v3/simple/price?ids=bitcoin,ethereum,dogecoin&vs_currencies=usd"
    
    try:
        response = requests.get(url)
        data = response.json()
        
        # Transform the data into a DataFrame
        df = pd.DataFrame([
            {
                'Cryptocurrency': 'Bitcoin',
                'Price (USD)': data['bitcoin']['usd'],
            },
            {
                'Cryptocurrency': 'Ethereum',
                'Price (USD)': data['ethereum']['usd'],
            },
            {
                'Cryptocurrency': 'Dogecoin',
                'Price (USD)': data['dogecoin']['usd'],
            }
        ])
        return df
    except Exception as e:
        st.error(f"Error fetching data: {str(e)}")
        return None

# Create placeholder for the table
table_placeholder = st.empty()

# Add a refresh rate selector
refresh_interval = st.sidebar.slider(
    "Refresh interval (seconds)",
    min_value=1,
    max_value=60,
    value=5
)

st.sidebar.markdown("---")
st.sidebar.markdown("### About")
st.sidebar.markdown("This dashboard shows real-time cryptocurrency prices.")
st.sidebar.markdown("Data is fetched from CoinGecko API.")

# Initialize session state for auto refresh
if 'auto_refresh' not in st.session_state:
    st.session_state.auto_refresh = True

# Auto refresh toggle
st.session_state.auto_refresh = st.sidebar.checkbox(
    "Auto refresh",
    value=True
)

# Main dashboard area
st.markdown("### Live Cryptocurrency Prices")
st.markdown("Data updates automatically based on the selected refresh interval.")

# Manual refresh button
if st.button("Refresh Data"):
    df = fetch_data()
    if df is not None:
        table_placeholder.table(df)

# Continuous update loop
while st.session_state.auto_refresh:
    df = fetch_data()
    if df is not None:
        table_placeholder.table(df)
    time.sleep(refresh_interval)