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TypeError: 'float' object is not iterable
Troy B
posted Dec 29, 2015
Seeking Help Getting Started

Looking for help with a newbie question. The attached algo works fine as long as I use the following: 

    .order_by(fundamentals.valuation.market_cap.desc())

However, if I change it order by either market cap "ascending" or ROE "ascending" (see below)

    .order_by(fundamentals.valuation.market_cap.asc())

or

    .order_by(fundamentals.operation_ratios.roe.asc())

I get the following error:

TypeError: 'float' object is not iterable
... USER ALGORITHM:34, in trade
shorts = ranks[ranks <= lower]

Can anyone tell me what's causing this and how to correct it? I'm guessing it's trying to combine values from different data types but am still new to Python and would appreciate help with this.

Thanks.

Troy

2 responses
Alisa Deychman
Dec 30, 2015

Hi Troy,

I cloned your algo and successfully ran a backtest sorting market_cap in ascending order. Perhaps you had a code error in an earlier version? If you still need help, feel free to ask questions.

cheers,
Alisa

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Troy B
Dec 31, 2015

Thanks Alisa. You're probably correct regarding the code error from an earlier version. It's working now in ascending order, and ordering by ROE works as well.

Thanks again,

Troy

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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.