Hello, I need a little help with my algo. Im trying to run a screen on my pipeline results but it doesn't seem to be working. Im new to python and quantopian so I wouldn't be surprised if I made a coding error somewhere along the line. I still have more to add to this but I have been stuck since yesterday on trying to get the screen function to work properly. Any help and other observations would be much appreciated!!!
Hi Santiago,
When you're defining factors using inequalities and boolean operators, you need to be very explicit with parentheses, because our order of operations in that area is not very good. What that means is that the definition for the screen should have parentheses around each individual inequality, like this:
(morningstar.valuation.market_cap.latest > 2000000000) & (USEquityPricing.close.latest > 5) & ('dollar_volume' > 10**7)Note that I'm also using & instead of and, as prescribed by the documentation here.
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Nathan Thanks so much for your help! I made the change and Im getting There was a runtime error.
ZeroDivisionError: float division by zero
...
USER ALGORITHM:73, in compute_weights
long_weight = context.my_leverage / len(context.long_final)
Any idea why?
You're getting a divide by 0 because context.long_final is empty. It's possible that your screen is returning nothing, but if I were to take a wild guess, one of he columns that's being returned in your dataframe is filled with nan's, and the call to dropna() is removing all the rows.
I would start by printing the contents of your pipeline out to the log and see what's in it.
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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.