app_graph_test.py

from flask import Flask, render_template, request, jsonify
from flask_socketio import SocketIO
import yfinance as yf
from datetime import datetime, timedelta
import plotly.graph_objs as go

app = Flask(__name__)
socketio = SocketIO(app)

@app.route("/")
def index():
    return render_template("test.html")

@socketio.on('get_graph')
def get_graph(ticker):
    # Define the stock ticker symbol and the date range
        ticker_symbol = ticker
        end_date = datetime.today()
        start_date = end_date - timedelta(days=90)

        # Fetch historical data using yfinance
        data = yf.download(ticker_symbol, start=start_date, end=end_date)

        # Create a candlestick graph using Plotly
        fig = go.Figure(data=[go.Candlestick(x=data.index.strftime('%Y-%m-%d').tolist(),
                        open=data['Open'].tolist(),
                        high=data['High'].tolist(),
                        low=data['Low'].tolist(),
                        close=data['Close'].tolist())])

        # Customize the layout
        fig.update_layout(title=f'Candlestick Chart for {ticker_symbol} in the Last 90 Days',
                        xaxis_title='Date',
                        yaxis_title='Price',
                        xaxis_rangeslider_visible=False)

        # # convert the fig to HTML DIV element
        # graph_html = fig.to_html(full_html=False,include_plotlyjs = False)
        # print(len(graph_html))
        # # socketio.emit('graph', fig.to_html(full_html=False,include_plotlyjs = False))
        graph_data = fig.to_plotly_json()
        socketio.emit('graph',graph_data)
        print("Graph is finished")

if __name__ == "__main__":
    socketio.run(app, host='0.0.0.0', port=7860)