Code Editor for app.py

import streamlit as st
import pandas as pd
import requests

st.title('Yahoo Finance Data Visualizer')

# Ask for the stock symbol
symbol = st.text_input('Enter Stock Symbol (e.g., AAPL, MSFT):')

if symbol:
    # Fetch data from Yahoo Finance API
    url = f'https://query1.finance.yahoo.com/v8/finance/chart/{symbol}'
    response = requests.get(url)
    data = response.json()   

    if 'chart' in data:
        # Extract required information
        series = data['chart']['result'][0]
        timestamps = series['timestamp']
        indicators = series['indicators']['quote'][0]
        open_prices = indicators['open']
        high_prices = indicators['high']
        low_prices = indicators['low']
        close_prices = indicators['close']

        # Convert timestamps to a readable format and create a DataFrame
        df = pd.DataFrame({
            'Date': pd.to_datetime(pd.Series(timestamps), unit='s'),
            'Open': open_prices,
            'High': high_prices,
            'Low': low_prices,
            'Close': close_prices
        })

        # Use altair to create a line chart
        st.subheader(f'{symbol} Price Chart')
        import altair as alt
        chart = alt.Chart(df).mark_line().encode(
            x='Date:T',
            y='Close:Q'
        )
        st.altair_chart(chart, use_container_width=True)
    else:
        st.error('Unable to fetch data. Please check the stock symbol.')