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docs/ccxt/wiki/examples/py/poloniex-fetch-trades-with-pagination-to-csv.md

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+- [Poloniex Fetch Trades With Pagination To Csv](./examples/py/)
+
+
+ ```python
+ # -*- coding: utf-8 -*-
+
+import os
+import sys
+import pandas as pd
+
+
+import ccxt  # noqa: E402
+
+exchange = ccxt.poloniex()
+exchange.load_markets()
+
+# Poloniex will only serve one year of data into the past
+
+symbol = 'BTC/USDT'
+before = exchange.milliseconds()
+previous_length = 0
+all_trades = {}
+
+while True:
+    try:
+        print('---------------------------------------------------------------')
+        print('Fetching trades before', exchange.iso8601(before))
+        params = {
+            'end': int(before / 1000)  # end param must be in seconds
+        }
+        trades = exchange.fetch_trades(symbol, None, None, params)
+        trades_by_id = exchange.index_by(trades, 'id')
+        before = trades[0]['timestamp']
+        all_trades = exchange.extend(all_trades, trades_by_id)
+        total_length = len(all_trades.keys())
+        print('Fetched', total_length, 'trades in total')
+        if total_length == previous_length:
+            break
+        previous_length = total_length
+    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'])
+
+# omitted_keys = ['fee', 'info']
+# all_trades = [exchange.omit(trade, omitted_keys) for trade in all_trades]
+# path_to_your_csv_file = 'trades.csv'  # change for your path here
+# df = pd.DataFrame(all_trades)
+# df.to_csv(path_to_your_csv_file, index=None, header=True)
+ 
+```