MaxApp/app.py

from flask import Flask, render_template, jsonify
from datetime import datetime
from sqlalchemy import create_engine,func
from sqlalchemy.orm import sessionmaker
from Coin import Coin, CoinMarketPosition

app = Flask(__name__)

engine = create_engine('sqlite:///coins.db', echo=False, connect_args={'check_same_thread':False})

# create a Session
Session = sessionmaker(bind=engine)
session = Session()

def result50(date=datetime.now()):
    result = []
    for x in session.query(CoinMarketPosition,Coin).filter(func.Date(CoinMarketPosition.date) == date.date()).distinct(Coin.id).join(Coin).order_by(CoinMarketPosition.market_caps.desc()).limit(50).all():
        result.append((x[1].symbol, x[0].market_caps))
    return result
    
@app.route("/")
@app.route('/top50async/<date>/')
def top50async(date="2020-01-12"):
    return render_template('async_list.html', date=date)

@app.route('/top50json/<date>/')
def top50json(date):
    d = datetime.strptime(date, "%d-%m-%Y")
    results = result50(d)
    arr = [{'name':x[0],'marketCap':x[1]} for x in results]
    return jsonify(arr)

@app.route('/coin/<id>/')
def coinHistory(id):
    results = session.query(CoinMarketPosition).filter(CoinMarketPosition.coin_id==id).all()
    return jsonify([ {'date':marketPos.date,'marketCap':marketPos.market_caps} for marketPos in results])

if __name__ == '__main__':
    app.run(debug=True)