ValueError: invalid literal for int() with base 10

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Hi all,
I am new to coding and still learning the ins and out. So I created a pipeline that filters stock based on the volatility and volume. With that, I wanted to get the past history of the stocks from the pipeline such that I am able to create a logic to buy based off MACD signals as well as trailing stop losses.
However, I encountered the error 'ValueError: invalid literal for int() with base 10' when trying to get the past price history as seen in the code below. Does anyone have a solution to this? Thanks so much in advance!

    fast=12  
    slow=26  
    sig=9  
    period = fast+slow+sig  
    stk = []  
    for stock in result.index:  
        stk.append(stock.symbol)  
    print (stk)  
    prices = data.history(stk, 'price', bar_count= period, frequency='1d')

2 responses

Dan Whitnable

The data.history method expects an asset or an iterable (eg a list or series) of assets. An asset is an object. It's not the ticker symbol. In the code above stk is just a list of symbols. Assuming result.index is the index of a pipeline, that is all you need. It's already the asset objects and can be iterated. So, something like this should work

    prices = data.history(result.index, 'price', bar_count= period, frequency='1d')

There is no need to create a separate list and the following code can be deleted

    for stock in result.index:  
        stk.append(stock.symbol)

There is more detail on the data.history method in the docs. Check it out here.

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Yu Wei Chia

Works! Thanks so much Dan. You're a life saver!

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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.

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