QUANTCONNECT COMMUNITY
Hello,
I am facing this error while backtesting and somehow it fails after running the backtest until midway. The same code works with smaller universe.
Code Line -
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for time, row in history.loc[symbol].iterrows():Error -
Runtime Error: TypeError : object is not callable
at OnSecuritiesChanged in main.py:line 52
at __init__ in main.py:line 138
TypeError : object is not callable (Open Stacktrace)
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Ray Trader
Any help would be appreciated.!!
Derek Melchin
Hi Ray,
This issue surfaced because the `history` DataFrame was empty for the given symbol. The symbol causing the problem in this situation is DRYS. For some reason, the `History` method returns an empty DataFrame for DRYS during backtesting while returning a full DataFrame in the research environment. I've opened a GitHub issue for this bug. Its progression can be tracked here.
Best,
Derek Melchin
The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.
Ray Trader
Thank you Derek Melchin
Dahui
Is there a recommended solution to this error? May be running in to similar issues. Thanks.
Shile Wen
Hi Dahui,
I'd suggest first checking if the Symbol is in the History request and also checking the .empty field of the History DataFrame before use.
Best,
Shile Wen
Ray Trader
The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.
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