Async Fetch Ohlcv Multiple Symbols Continuously

# -*- coding: utf-8 -*-

import os
import sys
from asyncio import run, gather

import ccxt.async_support as ccxt  # noqa: E402

print('CCXT Version:', ccxt.__version__)


async def fetch_ohlcv(exchange, symbol, timeframe, limit):
   since = None
   while True:
       try:
           ohlcv = await exchange.fetch_ohlcv(symbol, timeframe, since, limit)
           if len(ohlcv):
               first_candle = ohlcv[0]
               datetime = exchange.iso8601(first_candle[0])
               print(datetime, exchange.id, symbol, first_candle[1:])
       except Exception as e:
           print(type(e).__name__, str(e))


async def main():
   exchange = ccxt.binance()
   timeframe = '1m'
   limit = 1
   symbols = [ 'BTC/USDT', 'ETH/USDT' ]
   loops = [fetch_ohlcv(exchange, symbol, timeframe, limit) for symbol in symbols]
   await gather(*loops)
   await exchange.close()


run(main())