filters vs booleans?

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filters vs booleans?

posted

In this example, why is it that market_cap_filter is a NumExprFilter but is_bio_filter is False. I currently expect them to both be the same type of value since they're both the result of an equivalency operation.

Thanks!

1 response

There are some nuances/limitations on how to make filters. Basically, in this case the '==' operand isn't supported. See the documentation https://www.quantopian.com/help#quantopian_pipeline_filters_Filter . Also note that technically 'industry_code' is a classifier which have their own set of methods. What you would perhaps want to use is the '.eq' method.

  is_bio_filter     = industry_code.eq(20635084)

Another more general method is '.element_of'. This is nice because one could check for inclusion in a list of values.

  is_bio_filter     = industry_code.element_of([20635084])

Combined with the not ( ~ ) operator this can be pretty powerful.

  is_not_bio_filter     =  ~industry_code.element_of([20635084])

Good luck.

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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.