Why won't this algo run?

Quantopian's community platform is shutting down. Please read this post for more information and download your code.

Back to Community

Why won't this algo run?

edited

Hi,
I'm trying to grasp some of the more basic features of the IDE. I want to put a single stock into my universe, get a couple mavg and then do a comparision every day. I went and looked at the simple algorithm in the docs and I came up with this

def initialize(context):  
    context.security = symbols('SPY')

def handle_data(context, data):  
    ma1 = data[context.security].mavg(33)  
    ma2 = data[context.security].mavg(205)  
    if ma1 > ma2:  
        order_target_percent(context.security, 1.0)

    elif ma1 < ma2:  
        order_target_percent(context.security, 0.00)

The error I get says TypeError: unhashable type: 'list' at line 8
but this is the same way the algo in the docs here https://www.quantopian.com/help#sample-basic assigns mavg to a variable. What am I missing?
Thanks,
Aaron

4 responses

I went looking around at some of the algos in the community forums and figured out that I should be doing what I was trying like this

def initialize(context):  
    context.spy = sid(8554)  
def handle_data(context, data):

    ma1 = data[context.spy].mavg(33)  
    ma2 = data[context.spy].mavg(200)  
    if ma1 > ma2:  
        order_target_percent(context.spy, 1.0)

    elif ma1 < ma2:  
        order_target_percent(context.spy, 0.00)

I'm not sure why the first algo is breaking, but this is how it is supposed to be done.

symbol (as in the Quantopian example you referenced) and sid return an Equity; symbols returns a list of Equity objects. The data dictionary is indexed by Equity, not by list.

@ Aaron Olson

It will run if you change:

context.security = symbols('SPY')

to
context.security = symbol('SPY')

Thanks @ Vladimir Yevtushenko
I appreciate your help!

You've successfully submitted a support ticket.

Our support team will be in touch soon.

Need help? Contact support.

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.

About Quantopian

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.