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docs/ccxt/wiki/examples/py/async-basic-callchain.md

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+- [Async Basic Callchain](./examples/py/)
+
+
+ ```python
+ # -*- coding: utf-8 -*-
+
+import asyncio
+import os
+import sys
+
+
+import ccxt.async_support as ccxt  # noqa: E402
+
+
+async def run_all_exchanges(exchange_ids):
+    results = {}
+
+    for exchange_id in exchange_ids:
+
+        exchange = getattr(ccxt, exchange_id)({
+            'options': {
+                'useWebapiForFetchingFees': False,
+            }
+        })
+
+        symbol = 'ETH/BTC'
+        print('Exchange:', exchange_id)
+
+        print(exchange_id, 'symbols:')
+        markets = await load_markets(exchange, symbol)  # ←----------- STEP 1
+        print(list(markets.keys()))
+
+        print(symbol, 'ticker:')
+        ticker = await fetch_ticker(exchange, symbol)  # ←------------ STEP 2
+        print(ticker)
+
+        print(symbol, 'orderbook:')
+        orderbook = await fetch_orderbook(exchange, symbol)  # ←------ STEP 3
+        print(orderbook)
+
+        await exchange.close()  # ←----------- LAST STEP GOES AFTER ALL CALLS
+
+        results[exchange_id] = ticker
+
+    return results
+
+
+async def load_markets(exchange, symbol):
+    try:
+        result = await exchange.load_markets()
+        return result
+    except ccxt.BaseError as e:
+        print(type(e).__name__, str(e), str(e.args))
+        raise e
+
+
+async def fetch_ticker(exchange, symbol):
+    try:
+        result = await exchange.fetch_ticker(symbol)
+        return result
+    except ccxt.BaseError as e:
+        print(type(e).__name__, str(e), str(e.args))
+        raise e
+
+
+async def fetch_orderbook(exchange, symbol):
+    try:
+        result = await exchange.fetch_order_book(symbol)
+        return result
+    except ccxt.BaseError as e:
+        print(type(e).__name__, str(e), str(e.args))
+        raise e
+
+
+if __name__ == '__main__':
+    exchange_ids = ['bitfinex', 'okex', 'exmo']
+    exchanges = []
+    results = asyncio.run(run_all_exchanges(exchange_ids))
+    print([(exchange_id, ticker) for exchange_id, ticker in results.items()])
+ 
+```