QUANTCONNECT COMMUNITY
Hi Everyone,
Sorry for the newbie question, but I am just learning Python OOP and confused about something. Why is it that the classes defined in the Boot Camp code execute without being called? It's my understanding that for a class or method or function to do anything, it has to be called, with arguments passed in. But in the BC tutorials the classes are defined, but never called, and still produce output. What am I missing? Thanks in advance.
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Derek Melchin
Hi Briana,
In a full Python script, we need to call the methods to have them executed. However, when implementing in our web IDE, the user-defined algorithm (a subclass of QCAlgorithm) seats on top of our backtesting engine, LEAN. The methods of the QCAlgorithm that we implement are then automatically called by the algorithm manager upon execution.
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.
Briana Young
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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