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ArgCheck throwing exception when scheduling bound closures
Simon Thornington
posted Oct 4, 2015 
    pair = ['A','B']  
    pair_open = lambda c,d: maybe_open_position(c, d, pair)  
    pair_close = lambda c,d: eod_close_position(c, d, pair)  
    for t in times:  
        schedule_function(func=pair_open,  
                          date_rule=date_rules.every_day(),  
                          time_rule=time_rules.market_open(minutes=t))  
    # exit at close worst case  
    schedule_function(func=pair_close,  
                      date_rule=date_rules.every_day(),  
                      time_rule=time_rules.market_close(minutes=1))

Error Runtime exception: MismatchedArguments: lambda c, d accepts mismatched parameters

I am pretty sure this should work, for now I'll just switch to a regular function that specifically accepts context and data, but hopefully this can be fixed? I think it's part of the "pre-compile" checks again.

6 responses
Deleted User
Oct 4, 2015

Intraday pair trading cool!

Simon Thornington
Oct 4, 2015

Yeah, still trying, had any luck with it?

Deleted User
Oct 4, 2015

Haven't yet but intend to do it soon using distance approach.

Simon Thornington
Oct 5, 2015

Also - why is there no tag for Bug Report, that would seem to be an important one!

Jamie McCorriston
Oct 5, 2015

Hi Simon,

The schedule_function func parameter actually needs to use the reserved names context and data as it's parameters. If you change the c and d parameters in your lambda functions to context and data, everything should run smoothly!

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Jamie McCorriston
Oct 5, 2015

Also, we are working to remove the "pre-compile" checks from the IDE, which will make your debugging life a lot easier.

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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.