3. Why am I receiving an error?
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Why am I receiving an error?


  • I am trying to use the quickstart code from BackTrader. I downloaded S&P500 data from yahoo and saved it to an excel file titled SPY.csv.

    Here is my code so far:

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

import datetime  # For datetime objects
import os.path  # To manage paths
import sys  # To find out the script name (in argv[0])

# Import the backtrader platform
import backtrader as bt

if __name__ == '__main__':
    # Create a cerebro entity
    cerebro = bt.Cerebro()

    # Datas are in a subfolder of the samples. Need to find where the script is
    # because it could have been called from anywhere
    modpath = os.path.dirname(os.path.abspath(sys.argv[0]))
    datapath = os.path.join(modpath, "C:\\Users\\xboss\\Desktop\\SPY.csv")

    # Create a Data Feed
    data = bt.feeds.YahooFinanceCSVData(
        dataname=datapath,
        # Do not pass values before this date
        fromdate=datetime.datetime(2000, 1, 1),
        # Do not pass values after this date
        todate=datetime.datetime(2000, 12, 31),
        reverse=False)

    # Add the Data Feed to Cerebro
    cerebro.adddata(data)

    # Set our desired cash start
    cerebro.broker.setcash(100000.0)

    # Print out the starting conditions
    print('Starting Portfolio Value: %.2f' % cerebro.broker.getvalue())

    # Run over everything
    cerebro.run()

    # Print out the final result
    print('Final Portfolio Value: %.2f' % cerebro.broker.getvalue())

    Here is the error that I am receiving:

    Traceback (most recent call last):
  File "C:/Users/xboss/PycharmProjects/BackTraderDemo/backtrader_quickstart.py", line 39, in <module>
    cerebro.run()
  File "C:\Users\xboss\PycharmProjects\BackTraderDemo\venv\lib\site-packages\backtrader\cerebro.py", line 1127, in run
    runstrat = self.runstrategies(iterstrat)
  File "C:\Users\xboss\PycharmProjects\BackTraderDemo\venv\lib\site-packages\backtrader\cerebro.py", line 1212, in runstrategies
    data.preload()
  File "C:\Users\xboss\PycharmProjects\BackTraderDemo\venv\lib\site-packages\backtrader\feed.py", line 688, in preload
    while self.load():
  File "C:\Users\xboss\PycharmProjects\BackTraderDemo\venv\lib\site-packages\backtrader\feed.py", line 479, in load
    _loadret = self._load()
  File "C:\Users\xboss\PycharmProjects\BackTraderDemo\venv\lib\site-packages\backtrader\feed.py", line 710, in _load
    return self._loadline(linetokens)
  File "C:\Users\xboss\PycharmProjects\BackTraderDemo\venv\lib\site-packages\backtrader\feeds\yahoo.py", line 129, in _loadline
    dt = date(int(dttxt[0:4]), int(dttxt[5:7]), int(dttxt[8:10]))
ValueError: invalid literal for int() with base 10: '1/29'
    0
  • A

    Looks like date format in your data file doesn't match to YYYY-MM-DD used by bt.

    1

  • Thank you for your observation! I appreciate your time. I will look into changing the format.

    0
  • S

    See the link below, I think it's helpful to you.

    https://community.backtrader.com/topic/2637/dt-date-int-dttxt-0-4-int-dttxt-5-7-int-dttxt-8-10

    0

  • Or you could just use this line of code.

    import yfinance as yf

...

    data = bt.feeds.PandasData(dataname=yf.download("^gspc", start="2015-01-01", stop="2019-12-31"))
    1
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