Q2 migration - how to handle data[stock].Metric?

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Q2 migration - how to handle data[stock].Metric?

posted Apr 22, 2016

I'm working to convert an algo over to Q2 and encountered:

There was a runtime error.
AttributeError: 'zipline._protocol.SidView' object has no attribute 'Metric'
USER ALGORITHM:254, in CalculateWeighting
data[stock].Metric = allocation[k]

So, I guess the question is how do I cook something up like this:

dat[stock].Metric

The list of keys would need to be limited to stocks that the algo should be trading at any point in time (algo presently uses update_universe periodically). So, I suppose in before_trading_start I would see what stocks are in the portfolio and which ones are to be added, dropping everything else from dat[stock] (which is what update_universe was doing).

2 responses

Jamie McCorriston

Hi Grant,

The best resource for migration tips is the migration guide. It looks like this entry is what you're looking for.

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Thanks. I'll take a look. I think I need to re-create the old data rather than use the new one, though.

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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.

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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.