extending data feed ==> list index out of range issue

Zhangjt9317

Hi, I am new to backtrader, and I have a minute-based OHLCV dataset for BTC price, but with an extra 'Forecast' column. I read the extending data feeds post and made my own datafeed class as shown below:

class datafeed(GenericCSVData):
    lines = ('Forecast',)  # add a 'Forecast' line to the inherited ones from the base class
    params = (
        ('nullvalue', float('NaN')),
        ('dtformat', '%Y-%m-%d %H:%M:%S'),
        ('tmformat', '%H:%M:%S'),
        ('datetime', 1),
        ('open', 2),
        ('high', 3),
        ('low', 4),
        ('close', 5),
        ('volume', 6),
        ('Forecast', 11) # 11th col
    )

and I am trying to compare the open price and forecast price as a signal

    def __init__(self):
        # To control operation entries
        self.orderid = None

        # Create a CrossOver Signal from close an moving average
        self.signal = self.data.Forecast - self.data.open

But I have the error:

Traceback (most recent call last):
  File "D:/DailyTradeForecast.py", line 228, in <module>
    runstrategy()
  File "D:/DailyTradeForecast.py", line 159, in runstrategy
    cerebro.run()
  File "C:\Users\anaconda3\lib\site-packages\backtrader\cerebro.py", line 1127, in run
    runstrat = self.runstrategies(iterstrat)
  File "C:\Users\anaconda3\lib\site-packages\backtrader\cerebro.py", line 1212, in runstrategies
    data.preload()
  File "C:\Users\anaconda3\lib\site-packages\backtrader\feed.py", line 688, in preload
    while self.load():
  File "C:\Users\anaconda3\lib\site-packages\backtrader\feed.py", line 479, in load
    _loadret = self._load()
  File "C:\Users\anaconda3\lib\site-packages\backtrader\feed.py", line 710, in _load
    return self._loadline(linetokens)
  File "C:\Users\anaconda3\lib\site-packages\backtrader\feeds\csvgeneric.py", line 148, in _loadline
    csvfield = linetokens[csvidx]
IndexError: list index out of range

Process finished with exit code 1

I am not so sure what is wrong with my datafeed, or it is the error from the signal, can someone help?

vladisld

Could you please share at least a part of the csv file ?

Xu Liu

I have the same problem，My solution is to get more columns out。

Zhangjt9317

thank you all for the response, I solve the problem by following the documentation, just make sure you count the column number correctly (start from 0) and follow the extending data section in doc

sid_vishnu

@zhangjt9317 which documentation did you read to correct the code?

run-out

@sid_vishnu Try these:

Extending a Datafeed
Extended Data Feed: post