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docs/ccxt/wiki/examples/py/poloniex-fetch-trades-continuously.md

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+- [Poloniex Fetch Trades Continuously](./examples/py/)
+
+
+ ```python
+ # -*- coding: utf-8 -*-
+
+import os
+import sys
+
+
+import ccxt  # noqa: E402
+
+
+exchange = ccxt.poloniex()
+
+symbol = 'BTC/USDT'
+
+end_time = exchange.milliseconds() + 30 * 60 * 1000
+
+all_trades = {}
+
+while end_time > exchange.milliseconds():
+    try:
+        print('---------------------------------------------------------------')
+        trades = exchange.fetch_trades(symbol)
+        trades_by_id = exchange.index_by(trades, 'id')
+        all_trades = exchange.extend(all_trades, trades_by_id)
+        total_length = len(all_trades.keys())
+        time_remaining = int((end_time - exchange.milliseconds()) / 1000)
+        print(time_remaining, 'seconds left, fetched', total_length, symbol, 'trades in total')
+    except ccxt.NetworkError as e:
+        print(e)  # retry on next iteration
+    except ccxt.ExchangeError as e:
+        print(e)
+        break
+
+all_trades = exchange.sort_by(all_trades.values(), 'id')
+print('Fetched', len(all_trades), 'trades since', all_trades[0]['datetime'], 'till', all_trades[-1]['datetime'])
+ 
+```