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getting an error I wasn't expecting
sean mckenna
posted Dec 15, 2016
Seeking Help

I am trying to print out sorted stocks, but I am getting a strange error (or at least I think it's strange). 

def before_trading_start(context, data):  
    context.output = pipeline_output('example')

    context.longs = context.output[context.output.longs]  
    context.shorts = context.output[context.output.shorts]

    context.security_list = context.shorts.index.union(context.longs.index)  
    longs_to_order = context.longs.sort(['sma_rank'], ascending=False).head(5)  
    longs_to_order = longs_to_order.index  
    # Print the 5 securities with the lowest sma_rank.  
    #print "SHORT LIST"  
    #log.info("\n" + str(context.shorts.sort(['sma_rank'], ascending=True).head()))

    # Print the 5 securities with the highest sma_rank.  
    print "LONG LIST"  
    #log.info("\n" + str(context.longs.sort(['sma_rank'], ascending=False).head(5)))  
    for stock in longs_to_order:  
        print(data.current(stock, 'last_traded'))

I get this error:

TypeError: unsupported operand type(s) for *=: 'Timestamp' and 'float'
There was a runtime error on line 55.

3 responses
Ben Li
Oct 12, 2017

I hit the same issue when called by a closed (trade stopped ) security symbol('TIN'): 

data.current(symbol('TIN'), 'last_traded')

Any help?
Thanks!

Dan Dunn
Oct 13, 2017

That's hard to debug with the information provided. Also, it's probably better to create a new thread.

Can you please post the full shared backtest with the problem on another thread? Or contact support - we can help you there, too.

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Ben Li
Oct 15, 2017

Hi Dan Dunn,
Please see the new thread:
https://www.quantopian.com/posts/the-field-last-traded-doesnt-work-in-data-dot-current-method

Thanks.

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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.