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docs/ccxt/wiki/examples/py/async-fetch-order-book-from-many-exchanges.md

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+- [Async Fetch Order Book From Many Exchanges](./examples/py/)
+
+
+ ```python
+ # -*- coding: utf-8 -*-
+
+import asyncio
+import os
+import sys
+from pprint import pprint
+
+
+import ccxt.async_support as ccxt  # noqa: E402
+
+
+exchange_ids = [ 'binance', 'kucoin', 'huobipro' ]
+symbol = 'ETH/BTC'
+
+async def loop(exchange_id, symbol):
+
+    exchange_class = getattr(ccxt, exchange_id)
+    exchange = exchange_class()
+    orderbook = {}
+    try:
+        await exchange.load_markets()
+        # exchange.verbose = True  # uncomment for debugging purposes
+        orderbook = await exchange.fetch_order_book(symbol)
+    except Exception as e:
+        print(type(e).__name__, str(e))
+    await exchange.close()
+    return exchange.extend (orderbook, {
+        'exchange_id': exchange_id,
+        'symbol': symbol,
+    })
+
+
+async def run(exchange_ids, symbol):
+    coroutines = [loop(exchange_id, symbol) for exchange_id in exchange_ids]
+    return await asyncio.gather(*coroutines)
+
+
+main = run(exchange_ids, symbol)
+results = asyncio.run(main)
+for result in results:
+    bids = result['bids']
+    asks = result['asks']
+    print(
+        result['exchange_id'],
+        result['symbol'],
+        'top bid', bids[0], 'of', len(bids), 'bids,',
+        'top ask', asks[0], 'of', len(asks), 'asks'
+    )
+ 
+```