Bollinger Bands¶
- This example is based on:
from __future__ import print_function
from quantworks import strategy
from quantworks import plotter
from quantworks.tools import quandl
from quantworks.technical import bollinger
from quantworks.stratanalyzer import sharpe
from quantworks import broker as basebroker
class BBands(strategy.BacktestingStrategy):
def __init__(self, feed, instrument, bBandsPeriod):
super(BBands, self).__init__(feed)
self.__instrument = instrument
self.__bbands = bollinger.BollingerBands(feed[instrument].getCloseDataSeries(), bBandsPeriod, 2)
def getBollingerBands(self):
return self.__bbands
def onOrderUpdated(self, order):
if order.isBuy():
orderType = "Buy"
else:
orderType = "Sell"
self.info("%s order %d updated - Status: %s" % (
orderType, order.getId(), basebroker.Order.State.toString(order.getState())
))
def onBars(self, bars):
lower = self.__bbands.getLowerBand()[-1]
upper = self.__bbands.getUpperBand()[-1]
if lower is None:
return
shares = self.getBroker().getShares(self.__instrument)
bar = bars[self.__instrument]
if shares == 0 and bar.getClose() < lower:
sharesToBuy = int(self.getBroker().getCash(False) / bar.getClose())
self.info("Placing buy market order for %s shares" % sharesToBuy)
self.marketOrder(self.__instrument, sharesToBuy)
elif shares > 0 and bar.getClose() > upper:
self.info("Placing sell market order for %s shares" % shares)
self.marketOrder(self.__instrument, -1*shares)
def main(plot):
instrument = "yhoo"
bBandsPeriod = 40
# Download the bars.
feed = quandl.build_feed("WIKI", [instrument], 2011, 2012, ".")
strat = BBands(feed, instrument, bBandsPeriod)
sharpeRatioAnalyzer = sharpe.SharpeRatio()
strat.attachAnalyzer(sharpeRatioAnalyzer)
if plot:
plt = plotter.StrategyPlotter(strat, True, True, True)
plt.getInstrumentSubplot(instrument).addDataSeries("upper", strat.getBollingerBands().getUpperBand())
plt.getInstrumentSubplot(instrument).addDataSeries("middle", strat.getBollingerBands().getMiddleBand())
plt.getInstrumentSubplot(instrument).addDataSeries("lower", strat.getBollingerBands().getLowerBand())
strat.run()
print("Sharpe ratio: %.2f" % sharpeRatioAnalyzer.getSharpeRatio(0.05))
if plot:
plt.plot()
if __name__ == "__main__":
main(True)
this is what the output should look like:
2011-07-20 00:00:00 strategy [INFO] Placing buy market order for 74183 shares
2011-07-20 00:00:00 strategy [INFO] Buy order 1 updated - Status: SUBMITTED
2011-07-21 00:00:00 strategy [INFO] Buy order 1 updated - Status: ACCEPTED
2011-07-21 00:00:00 broker.backtesting [DEBUG] Not enough cash to fill yhoo order [1] for 74183 share/s
2011-07-21 00:00:00 strategy [INFO] Buy order 1 updated - Status: CANCELED
2011-07-21 00:00:00 strategy [INFO] Placing buy market order for 73583 shares
2011-07-21 00:00:00 strategy [INFO] Buy order 2 updated - Status: SUBMITTED
2011-07-22 00:00:00 strategy [INFO] Buy order 2 updated - Status: ACCEPTED
2011-07-22 00:00:00 broker.backtesting [DEBUG] Not enough cash to fill yhoo order [2] for 73583 share/s
2011-07-22 00:00:00 strategy [INFO] Buy order 2 updated - Status: CANCELED
2011-07-25 00:00:00 strategy [INFO] Placing buy market order for 73046 shares
2011-07-25 00:00:00 strategy [INFO] Buy order 3 updated - Status: SUBMITTED
2011-07-26 00:00:00 strategy [INFO] Buy order 3 updated - Status: ACCEPTED
2011-07-26 00:00:00 broker.backtesting [DEBUG] Not enough cash to fill yhoo order [3] for 73046 share/s
2011-07-26 00:00:00 strategy [INFO] Buy order 3 updated - Status: CANCELED
2011-07-27 00:00:00 strategy [INFO] Placing buy market order for 73610 shares
2011-07-27 00:00:00 strategy [INFO] Buy order 4 updated - Status: SUBMITTED
2011-07-28 00:00:00 strategy [INFO] Buy order 4 updated - Status: ACCEPTED
2011-07-28 00:00:00 broker.backtesting [DEBUG] Not enough cash to fill yhoo order [4] for 73610 share/s
2011-07-28 00:00:00 strategy [INFO] Buy order 4 updated - Status: CANCELED
2011-07-28 00:00:00 strategy [INFO] Placing buy market order for 74074 shares
2011-07-28 00:00:00 strategy [INFO] Buy order 5 updated - Status: SUBMITTED
2011-07-29 00:00:00 strategy [INFO] Buy order 5 updated - Status: ACCEPTED
2011-07-29 00:00:00 broker.backtesting [DEBUG] Not enough cash to fill yhoo order [5] for 74074 share/s
2011-07-29 00:00:00 strategy [INFO] Buy order 5 updated - Status: CANCELED
2011-07-29 00:00:00 strategy [INFO] Placing buy market order for 76335 shares
2011-07-29 00:00:00 strategy [INFO] Buy order 6 updated - Status: SUBMITTED
2011-08-01 00:00:00 strategy [INFO] Buy order 6 updated - Status: ACCEPTED
2011-08-01 00:00:00 broker.backtesting [DEBUG] Not enough cash to fill yhoo order [6] for 76335 share/s
2011-08-01 00:00:00 strategy [INFO] Buy order 6 updated - Status: CANCELED
2011-08-01 00:00:00 strategy [INFO] Placing buy market order for 76335 shares
2011-08-01 00:00:00 strategy [INFO] Buy order 7 updated - Status: SUBMITTED
2011-08-02 00:00:00 strategy [INFO] Buy order 7 updated - Status: ACCEPTED
2011-08-02 00:00:00 strategy [INFO] Buy order 7 updated - Status: FILLED
2011-09-15 00:00:00 strategy [INFO] Placing sell market order for 76335 shares
2011-09-15 00:00:00 strategy [INFO] Sell order 8 updated - Status: SUBMITTED
2011-09-16 00:00:00 strategy [INFO] Sell order 8 updated - Status: ACCEPTED
2011-09-16 00:00:00 strategy [INFO] Sell order 8 updated - Status: FILLED
2012-02-17 00:00:00 strategy [INFO] Placing buy market order for 77454 shares
2012-02-17 00:00:00 strategy [INFO] Buy order 9 updated - Status: SUBMITTED
2012-02-21 00:00:00 strategy [INFO] Buy order 9 updated - Status: ACCEPTED
2012-02-21 00:00:00 broker.backtesting [DEBUG] Not enough cash to fill yhoo order [9] for 77454 share/s
2012-02-21 00:00:00 strategy [INFO] Buy order 9 updated - Status: CANCELED
2012-02-21 00:00:00 strategy [INFO] Placing buy market order for 78819 shares
2012-02-21 00:00:00 strategy [INFO] Buy order 10 updated - Status: SUBMITTED
2012-02-22 00:00:00 strategy [INFO] Buy order 10 updated - Status: ACCEPTED
2012-02-22 00:00:00 strategy [INFO] Buy order 10 updated - Status: FILLED
2012-06-29 00:00:00 strategy [INFO] Placing sell market order for 78819 shares
2012-06-29 00:00:00 strategy [INFO] Sell order 11 updated - Status: SUBMITTED
2012-07-02 00:00:00 strategy [INFO] Sell order 11 updated - Status: ACCEPTED
2012-07-02 00:00:00 strategy [INFO] Sell order 11 updated - Status: FILLED
2012-08-10 00:00:00 strategy [INFO] Placing buy market order for 82565 shares
2012-08-10 00:00:00 strategy [INFO] Buy order 12 updated - Status: SUBMITTED
2012-08-13 00:00:00 strategy [INFO] Buy order 12 updated - Status: ACCEPTED
2012-08-13 00:00:00 strategy [INFO] Buy order 12 updated - Status: FILLED
2012-10-23 00:00:00 strategy [INFO] Placing sell market order for 82565 shares
2012-10-23 00:00:00 strategy [INFO] Sell order 13 updated - Status: SUBMITTED
2012-10-24 00:00:00 strategy [INFO] Sell order 13 updated - Status: ACCEPTED
2012-10-24 00:00:00 strategy [INFO] Sell order 13 updated - Status: FILLED
Sharpe ratio: 0.71
and this is what the plot should look like:
You can get better returns by tunning the Bollinger Bands period as well as the entry and exit points.