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docs/ccxt/wiki/examples/py/fetch-ohlcv-on-new-candle.md

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+- [Fetch Ohlcv On New Candle](./examples/py/)
+
+
+ ```python
+ # -*- coding: utf-8 -*-
+
+import os
+import sys
+import time
+import ccxt  # noqa: E402
+from ccxt.base.decimal_to_precision import ROUND_UP  # noqa: E402
+# common constants
+
+msec = 1000
+minute = 60 * msec
+hold = 30
+exchange = ccxt.binance()
+
+limit = 500
+timeframe = "5m"
+interval = exchange.parse_timeframe(timeframe) * 1000
+
+while True:
+
+    try:
+
+        print(exchange.milliseconds(), 'Fetching candles')
+        since = exchange.round_timeframe(timeframe, exchange.milliseconds(), ROUND_UP) - (limit * interval)
+        ohlcv = exchange.fetch_ohlcv('ETH/BTC', timeframe, since=since, limit=limit)
+        print(exchange.milliseconds(), 'Fetched', len(ohlcv), 'candles')
+        first = ohlcv[0][0]
+        last = ohlcv[-1][0]
+        print('First candle epoch', first, exchange.iso8601(first))
+        print('Last candle epoch', last, exchange.iso8601(last))
+        # Calculate time to next candle and sleep for that many seconds
+        sleeptime = (exchange.round_timeframe(timeframe, last, ROUND_UP) - exchange.milliseconds()) / 1000
+        print('sleeping for: ', sleeptime, 's', sleeptime // 60, 'min')
+        time.sleep(sleeptime)
+    except (ccxt.ExchangeError, ccxt.AuthenticationError, ccxt.ExchangeNotAvailable, ccxt.RequestTimeout) as error:
+
+        print('Got an error', type(error).__name__, error.args, ', retrying in', hold, 'seconds...')
+        time.sleep(hold)
+ 
+```