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docs/ccxt/wiki/examples/py/async-fetch-many-orderbooks-continuously.md

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+- [Async Fetch Many Orderbooks Continuously](./examples/py/)
+
+
+ ```python
+ # -*- coding: utf-8 -*-
+
+import os
+import sys
+from asyncio import gather, run
+
+
+import ccxt.async_support as ccxt  # noqa: E402
+
+
+async def symbol_loop(exchange, symbol):
+    print('Starting the', exchange.id, 'symbol loop with', symbol)
+    while True:
+        try:
+            orderbook = await exchange.fetch_order_book(symbol)
+            now = exchange.milliseconds()
+            print(exchange.iso8601(now), exchange.id, symbol, orderbook['asks'][0], orderbook['bids'][0])
+
+            # --------------------> DO YOUR LOGIC HERE <------------------
+
+        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 exchange_loop(exchange_id, symbols):
+    print('Starting the', exchange_id, 'exchange loop with', symbols)
+    exchange = getattr(ccxt, exchange_id)()
+    loops = [symbol_loop(exchange, symbol) for symbol in symbols]
+    await gather(*loops)
+    await exchange.close()
+
+
+async def main():
+    exchanges = {
+        'okex': ['BTC/USDT', 'ETH/BTC', 'ETH/USDT'],
+        'binance': ['BTC/USDT', 'ETH/BTC'],
+        'bitfinex': ['BTC/USDT'],
+    }
+    loops = [exchange_loop(exchange_id, symbols) for exchange_id, symbols in exchanges.items()]
+    await gather(*loops)
+
+
+run(main())
+ 
+```