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docs/ccxt/wiki/examples/py/async-orderbooks.md

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+- [Async Orderbooks](./examples/py/)
+
+
+ ```python
+ # -*- coding: utf-8 -*-
+
+import asyncio
+import ccxt
+import ccxt.async_support as ccxta  # noqa: E402
+import time
+import os
+import sys
+
+
+
+async def async_client(exchange, symbol):
+    client = getattr(ccxta, exchange)()
+    await client.load_markets()
+    if symbol not in client.symbols:
+        raise Exception(exchange + ' does not support symbol ' + symbol)
+    while True:
+        try:
+            orderbook = await client.fetch_order_book(symbol)
+            datetime = client.iso8601(client.milliseconds())
+            print(datetime, client.id, symbol, orderbook['bids'][0], orderbook['asks'][0])
+        except Exception as e:
+            print(type(e).__name__, e.args, str(e))  # comment if not needed
+            # break  # uncomment to break it
+            # pass   # uncomment to do nothing and just retry again on next iteration
+            # or add your own reaction according to the purpose of your app
+    await client.close()
+
+
+async def multi_orderbooks(exchanges, symbol):
+    input_coroutines = [async_client(exchange, symbol) for exchange in exchanges]
+    await asyncio.gather(*input_coroutines, return_exceptions=True)
+
+
+if __name__ == '__main__':
+
+    # Consider review request rate limit in the methods you call
+    exchanges = ["bittrex", "bitfinex", "poloniex"]
+    symbol = 'ETH/BTC'
+
+    asyncio.run(multi_orderbooks(exchanges, symbol))
+ 
+```