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Writing to the Log from a Non Algorithm Class

Quick Question.  I am new to QuantConnect

When I am in a class like an Alpha where I do not have a reference to the Algorithm class, how can I write information to the Log?

Any help much appreciated.

Will

Update Backtest







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Hi Will! The API is accessible via the algorithm object, you can see this in the Update(self, algorithm, data) method. The log method would be on algorithm.Log()

I've updated the documentation to make this more explicit for others who have this same question. 

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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.


Make a field in your algorithm class (here assuming it's called MyAlgorithm):

public static MyAlgorithm _instance;

Or if you like, ,make it private and dress it properly in a singleton getter method...

Then you can do:

MyAlgorithm._instance.Log("This is a log message");

IMO, a Lean algorithm inside the project assembly is a case where singleton/global is perfectly warranted.

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It is late and I realized Python is a different language... and I can't delete my post, lol. Python still has globals though.

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Update Backtest





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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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