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docs/ccxt/examples/ccxt.pro/py/watch-many-exchanges-many-tickers.py

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+# -*- coding: utf-8 -*-
+
+from asyncio import run, gather
+import ccxt.pro
+
+
+print('CCXT Version:', ccxt.__version__)
+
+
+async def exchange_loop(exchange_id, symbols):
+    exchange = getattr(ccxt.pro, exchange_id)()
+    markets = await exchange.load_markets()
+    await gather(*[watch_ticker_loop(exchange, symbol) for symbol in symbols])
+    await exchange.close()
+
+
+async def watch_ticker_loop(exchange, symbol):
+    # exchange.verbose = True  # uncomment for debugging purposes if necessary
+    while True:
+        try:
+            ticker = await exchange.watch_ticker(symbol)
+            now = exchange.milliseconds()
+            print(exchange.iso8601(now), exchange.id, symbol, 'bid:', ticker['bid'], 'ask:', ticker['ask'], 'last:', ticker['last'], 'on', ticker['datetime'])
+        except Exception as e:
+            print(str(e))
+            # raise e  # uncomment to break all loops in case of an error in any one of them
+            break  # you can break just this one loop if it fails
+
+
+async def main():
+    exchanges = {
+        'binance': [ 'BTC/USDT', 'ETH/USDT' ],
+        'ftx': [ 'BTC/USD', 'ETH/USD' ],
+    }
+    loops = [exchange_loop(exchange_id, symbols) for exchange_id, symbols in exchanges.items()]
+    await gather(*loops)
+
+
+run(main())