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docs/ccxt/wiki/examples/py/async-orderbooks-from-multiple-exchanges-at-once.md

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+- [Async Orderbooks From Multiple Exchanges At Once](./examples/py/)
+
+
+ ```python
+ # -*- coding: utf-8 -*-
+
+import asyncio
+import ccxt
+import ccxt.async_support as ccxta  # noqa: E402
+import time
+import os
+import sys
+
+
+symbol = 'ETH/BTC'
+
+
+def sync_client(exchange_id):
+    orderbook = None
+    exchange = getattr(ccxt, exchange_id)()
+    try:
+        exchange.load_markets()
+        market = exchange.market(symbol)
+        orderbook = exchange.fetch_order_book(market['symbol'])
+    except Exception as e:
+        print(type(e).__name__, str(e))
+    return { 'exchange': exchange.id, 'orderbook': orderbook }
+
+
+async def async_client(exchange_id):
+    orderbook = None
+    exchange = getattr(ccxta, exchange_id)()
+    try:
+        await exchange.load_markets()
+        market = exchange.market(symbol)
+        orderbook = await exchange.fetch_order_book(market['symbol'])
+    except Exception as e:
+        print(type(e).__name__, str(e))
+    await exchange.close()
+    return { 'exchange': exchange.id, 'orderbook': orderbook }
+
+
+async def multi_orderbooks(exchanges):
+    input_coroutines = [async_client(exchange) for exchange in exchanges]
+    orderbooks = await asyncio.gather(*input_coroutines, return_exceptions=True)
+    return orderbooks
+
+
+if __name__ == '__main__':
+
+    # Consider review request rate limit in the methods you call
+    exchanges = ["kucoin", "bittrex", "bitfinex", "poloniex", "huobipro"]
+
+    tic = time.time()
+    a = asyncio.run(multi_orderbooks(exchanges))
+    print("async call spend:", time.time() - tic)
+
+    time.sleep(1)
+
+    tic = time.time()
+    a = [sync_client(exchange) for exchange in exchanges]
+    print("sync call spend:", time.time() - tic)
+ 
+```