MACD_example_from_docs.py

from __future__ import (absolute_import, division, print_function,
                        unicode_literals)

import argparse
import collections
import datetime

import backtrader as bt

MAINSIGNALS = collections.OrderedDict(
    (('longshort', bt.SIGNAL_LONGSHORT),
     ('longonly', bt.SIGNAL_LONG),
     ('shortonly', bt.SIGNAL_SHORT),)
)


EXITSIGNALS = {
    'longexit': bt.SIGNAL_LONGEXIT,
    'shortexit': bt.SIGNAL_LONGEXIT,
}


class SMACloseSignal(bt.Indicator):
    lines = ('signal',)
    params = (('period', 30),)

    def __init__(self):
        self.lines.signal = self.data - bt.indicators.SMA(period=self.p.period)


class SMAExitSignal(bt.Indicator):
    lines = ('signal',)
    params = (('p1', 5), ('p2', 30),)

    def __init__(self):
        sma1 = bt.indicators.SMA(period=self.p.p1)
        sma2 = bt.indicators.SMA(period=self.p.p2)
        self.lines.signal = sma1 - sma2


def runstrat(args=None):
    args = parse_args(args)

    cerebro = bt.Cerebro()
    cerebro.broker.set_cash(args.cash)

    dkwargs = dict()
    if args.fromdate is not None:
        fromdate = datetime.datetime.strptime(args.fromdate, '%Y-%m-%d')
        dkwargs['fromdate'] = fromdate

    if args.todate is not None:
        todate = datetime.datetime.strptime(args.todate, '%Y-%m-%d')
        dkwargs['todate'] = todate

    # if dataset is None, args.data has been given
    data = bt.feeds.BacktraderCSVData(dataname=args.data, **dkwargs)
    cerebro.adddata(data)

    cerebro.add_signal(MAINSIGNALS[args.signal],
                       SMACloseSignal, period=args.smaperiod)

    if args.exitsignal is not None:
        cerebro.add_signal(EXITSIGNALS[args.exitsignal],
                           SMAExitSignal,
                           p1=args.exitperiod,
                           p2=args.smaperiod)

    cerebro.run()
    if args.plot:
        pkwargs = dict(style='bar')
        if args.plot is not True:  # evals to True but is not True
            npkwargs = eval('dict(' + args.plot + ')')  # args were passed
            pkwargs.update(npkwargs)

        cerebro.plot(**pkwargs)


def parse_args(pargs=None):

    parser = argparse.ArgumentParser(
        formatter_class=argparse.ArgumentDefaultsHelpFormatter,
        description='Sample for Signal concepts')

    parser.add_argument('--data', required=False,
                        default='./datas/2005-2006-day-001.txt',
                        help='Specific data to be read in')

    parser.add_argument('--fromdate', required=False, default=None,
                        help='Starting date in YYYY-MM-DD format')

    parser.add_argument('--todate', required=False, default=None,
                        help='Ending date in YYYY-MM-DD format')

    parser.add_argument('--cash', required=False, action='store',
                        type=float, default=50000,
                        help=('Cash to start with'))

    parser.add_argument('--smaperiod', required=False, action='store',
                        type=int, default=30,
                        help=('Period for the moving average'))

    parser.add_argument('--exitperiod', required=False, action='store',
                        type=int, default=5,
                        help=('Period for the exit control SMA'))

    parser.add_argument('--signal', required=False, action='store',
                        default=MAINSIGNALS.keys()[0], choices=MAINSIGNALS,
                        help=('Signal type to use for the main signal'))

    parser.add_argument('--exitsignal', required=False, action='store',
                        default=None, choices=EXITSIGNALS,
                        help=('Signal type to use for the exit signal'))

    # Plot options
    parser.add_argument('--plot', '-p', nargs='?', required=False,
                        metavar='kwargs', const=True,
                        help=('Plot the read data applying any kwargs passed\n'
                              '\n'
                              'For example:\n'
                              '\n'
                              '  --plot style="candle" (to plot candles)\n'))

    if pargs is not None:
        return parser.parse_args(pargs)

    return parser.parse_args()


if __name__ == '__main__':
    runstrat()