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Update universe question
Dennis Drost
posted

Hi everyone,

I'm relatively new to python and so far i have not been able to code the following idea in quantopian:
let's say every monday i want to buy make sure i start the week with 10 different stocks. over the week i sell some of these stocks, and the next monday i want to add new stocks so that i have 10 different stocks again. I know i can update my universe and then use fundamental data to get a list of x stocks i can buy. The point i'm struggling with is how i can keep the stocks i still have in my portfolio. I do not want to start with 10 new stocks every monday, i want to keep the ones i still have from the previous week, but add new ones for the ones i sold over the week.

All help is welcome, thank you in advance.

Kind regards,
Dennis

4 responses
Dennis Drost

No one has any tips for me to do this?

Deleted User

Hi Dennis,

The stocks you hold in your portfolio will be a part of your universe until you sell them. For example, if you hold AAPL in your portfolio, AAPL will be included in the data object for every bar where it has a price. If you you sell all of your shares of AAPL and then pass update_universe an array stocks that does not contain AAPL, AAPL will no longer be a part of your universe.

If you wan't to make sure your maximum universe size is always 10, you can subtract the the number of stocks held in your portfolio from the length limit on your get_fundamentals call. Something like:

fundamental_df = get_fundamentals(  
        query(  
            fundamentals.valuation_ratios.forward_pe_ratio,  
            fundamentals.operation_ratios.total_debt_equity_ratio  
        )  
        .limit(10 - len(context.portfolio.positions.keys()))  
    )  
update_universe(fundamental_df.columns.values)  
'''
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Dennis Drost

Thank you!
After so many failed attempts i did not expecht it to be that easy. So basically as long as i use update universe, only the stocks i still have shares in will stay and the rest will be removed?

Kind regards,
Dennis

Deleted User

That is correct! Let me know if you need any help getting set up.

Andrew

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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 Quantopian.

In addition, the material offers no opinion with respect to the suitability of any security or specific investment. No information contained herein should be regarded as a suggestion to engage in or refrain from any investment-related course of action as none of Quantopian nor any of its affiliates is undertaking to provide investment advice, act as an adviser to any plan or entity subject to the Employee Retirement Income Security Act of 1974, as amended, individual retirement account or individual retirement annuity, or give advice in a fiduciary capacity with respect to the materials presented herein. If you are an individual retirement or other investor, contact your financial advisor or other fiduciary unrelated to Quantopian about whether any given investment idea, strategy, product or service described herein may be appropriate for your circumstances. All investments involve risk, including loss of principal. Quantopian 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.