3. 'Cerebro' object has no attribute '_exactbars' [pandas/.csv]
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'Cerebro' object has no attribute '_exactbars' [pandas/.csv] 


  • from datetime import datetime
import argparse
import backtrader as bt
import backtrader.feeds as btfeeds
import pandas

class SmaCross(bt.SignalStrategy):
    params = (('pfast', 10), ('pslow', 30),)
    def __init__(self):
            sma1, sma2 = bt.ind.SMA(period=self.p.pfast), bt.ind.SMA(period=self.p.pslow)
            self.signal_add(bt.SIGNAL_LONG, bt.ind.CrossOver(sma1, sma2))
    
cerebro = bt.Cerebro()

args = parse_args()
datapath = ('/Users/rf/Documents/DSC/Datasets/abn.csv')
skiprows = 1 if args.noheaders else 0
header = None if args.noheaders else 0

dataframe = pandas.read_csv(datapath,
                            skiprows=skiprows,
                            header=header,
                            parse_dates=True,
                            index_col=0)

if not args.noprint:
    print(dataframe)

data = bt.feeds.PandasData(dataname=dataframe)
cerebro.addstrategy(SmaCross)
cerebro.run()
cerebro.plot()

    Gives me the output:

    
  File "<ipython-input-28-82fff6a4d3c7>", line 34, in <module>
    cerebro.plot()

  File "/anaconda/lib/python3.6/site-packages/backtrader/cerebro.py", line 978, in plot
    if self._exactbars > 0:

AttributeError: 'Cerebro' object has no attribute '_exactbars'

    Where do I go or do wrong?

    0
    B
     1 Reply
  • B
    administrators

    @fbleaux said in 'Cerebro' object has no attribute '_exactbars' [pandas/.csv]:

    data = bt.feeds.PandasData(dataname=dataframe)
cerebro.addstrategy(SmaCross)
cerebro.run()

    That's a bug not triggered ever before. But due to an obvious user code bug in those 3 lines.

    • The data has not been added to the system, neither directly with adddata nor indirectly with other methods like resampledata, replaydata and some others.
    1

  • How could I miss that. Thank you.

    0