Record Price Sold At?

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Record Price Sold At?

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I'm using the basic trading algorithm here (https://www.quantopian.com/help#sample-basic) and making some small tweaks.

Every time I sell the position I want to be able to record the price I sold it at so that the next time I buy in is only if it is X% higher or Y% lower than the last value.

I know that for positions I've bought and currently hold I can use the context.portfolio.positions object and look at the cost basis, and that for open orders I can scan by SID. But, since I'm buying and selling the same stock over and over again I'll have lots of previous orders which creates two problems:

1) I'm not sure how I would sort those previous orders so that I can only grab the latest one and get the cost basis.

2) In theory my algo would get slower and slower over time as I pull back more and more orders with this method.

So is there a way to limit the orders returned to the most recent of a sell position? And is this the best way to get that value?

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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.