AttributeError: object has no attribute 'bar_executed'

KopiC

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'"

ab_trader

You missed self.bar_executed = len(self) in the notify_order() function.

KopiC

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

ab_trader

The code shown in the Do not only buy … but SELL works as is with the data feed shown there, I've tested it right before my previous answer. Your error pointed that self.bar_executed variable is not defined. My conclusion is that you run different code where self.bar_executed is not defined.

KopiC

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())

KopiC

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