Why I can't use the order(sid(mysid), 20)?

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Why I can't use the order(sid(mysid), 20)?

posted

The following code is OK:
... order(sid(24), 20)
...

But following I get error:
... mysid = 24
order(sid(mysid), 20)
...

Error: The sid(id) method takes one parameter.

Why?

3 responses

I think the problem is that by design, you need a literal as id. The design of the API includes scanning over the code, looking for sid(id) and then loading those securities into the data object. If you make id a variable in the code, then the automatic searching and loading of securities doesn't work. At least that's my take on it. Kinda weird, but it shouldn't hamper your coding.

It seems that Q could fix this problem, by making it so that if you write sid(id) with id a variable, the API would look in the data object, instead of throwing an exception.

Hi,

Thanks for the reply.

But what do you mean "Q could fix this problem"? What/who is Q?

Cheers

Hello Thomas,

Q as in Q uantopian.

Regarding fixing the problem, I mean that I think that when they scan the code for sids, ones without literals could be ignored. Then, when sid(x) is called in the code, it would accept the variable x instead of throwing an exception. I don't know how feasible this is, and once you know how things work, it is not an impediment. It's not a high priority, in my mind.

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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.