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docs/ccxt/wiki/examples/py/poloniex-fetch-order-books.md

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+- [Poloniex Fetch Order Books](./examples/py/)
+
+
+ ```python
+ # -*- coding: utf-8 -*-
+
+import os
+import sys
+from pprint import pprint
+
+
+import ccxt  # noqa: E402
+
+id = 'poloniex'
+
+# instantiate the exchange by id
+exchange = getattr(ccxt, id)({
+    # 'proxy':'https://cors-anywhere.herokuapp.com/',
+})
+
+# load all markets from the exchange
+markets = exchange.load_markets()
+
+# this will work (a limited number of symbols)
+result = exchange.fetch_order_books(['ETH/BTC', 'LTC/BTC'])
+pprint(result)
+
+# this will also work (a limited number of symbols)
+result = exchange.fetch_order_books(exchange.symbols[0:10])
+pprint(result)
+
+# this will not work (too many symbols)
+result = exchange.fetch_order_books(exchange.symbols)
+pprint(result)
+ 
+```