Posts made by KopiC

I just reviewed the code again and finally fixed the issues by myself.

Thanks for your quick response. Your conclusion is not correct.

My code is almost the same as the original one, but I used AAPL data derived from yahoo ( max time span, downloaded as a csv file). To make it clear I post it at the bottom.

I tested the code several times, and finally find that the error popped up when I selected 2015,3,1 as fromdate.

from future import (absolute_import, division, print_function, unicode_literals)
import datetime
import backtrader as bt

class TestStrategy(bt.Strategy):
def log(self, txt, dt = None):
dt = dt or self.datas[0].datetime.date(0) #?
print ('%s, %s' % (dt.isoformat(),txt))

def __init__(self):
    self.dataclose = self.datas[0].close
    self.order = None

def notify_order(self, order):
    if order.status in [order.Submitted, order.Accepted]:
        if order.isbuy():
            self.log('BUY EXECUTED, %.2f' % order.executed.price)
        elif order.issell():
            self.log('SELL EXECUTED, %.2f' % order.executed.price)
        self.bar_executed = len(self) # this is confusing at bit.
    elif order.status in [order.Canceled, order.Margin, order.Rejected]:
        self.log('Order Canceled/Margin/Rejected')
    self.order = None

def next(self):
    self.log('Close, %.2f' % self.dataclose[0])

    if self.order:
        return

    if not self.position: # check if we are in the market
        if self.dataclose[0] < self.dataclose[-1]:
            if self.dataclose[-1] < self.dataclose[-2]:
                self.log('BUY CREATE, %.2f' % self.dataclose[0])
                self.buy()
        else:
            if len(self) >= (self.bar_executed + 5):
                self.log('SELL CREATE, %.2f' % self.dataclose[0])
                self.order = self.sell()

if name == 'main':
cerebro = bt.Cerebro()

cerebro.addstrategy(TestStrategy)

datafile = 'AAPL.csv'
data = bt.feeds.YahooFinanceCSVData(
    dataname = datafile,
    fromdate = datetime.datetime(2015,3,1),
    todate = datetime.datetime(2020,7,30),
    reverse = False)

cerebro.adddata(data)

cerebro.broker.setcash(100000.0)

print ('Starting Portfolio Value: %.2f' % cerebro.broker.getvalue())

cerebro.run()

print ('Final Portfolio Value: %.2f' % cerebro.broker.getvalue())

It is not missed in the function.

Here below is the codes of the function I copied from the guide and tried it on my laptop

def notify_order(self, order):
    if order.status in [order.Submitted, order.Accepted]:
        if order.isbuy():
            self.log('BUY EXECUTED, %.2f' % order.executed.price)
        elif order.issell():
            self.log('SELL EXECUTED, %.2f' % order.executed.price)
        self.bar_executed = len(self)
    elif order.status in [order.Canceled, order.Margin, order.Rejected]:
        self.log('Order Canceled/Margin/Rejected')
    self.order = None

Hello all,

I just started to learn backtrader with Quickstart Guide.

When trying the sample codes of the "Do not only buy … but SELL" section on the guide, I met a problem I cannot overcome. Can anyone give your hand to me?

Here below is the debug output.

"AttributeError: 'Lines_LineSeries_LineIterator_DataAccessor_Strateg' object has no attribute 'bar_executed'"