Build Error Annoyances: "Nonexistent property:sid"

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posted Apr 18, 2014

I'm trying to improve my open source quantopian R&D framework, but I keep running into what appears to be sandboxing limitations.

the latest is: If I have this method in my main class, I get the build error mentioned in the subject.

    def GetOrCreateSecuritySecurities(this,qsecArray):  
        '''pass in an array of quantopian sec (ex:  [sid(24),sid(3113)])  
        and returns an array of unique security objects wrapping them.   duplicate sids are ignored'''

        try:  
            securities = {}  
            if not qsecArray:  
                return securities

            for qsec in qsecArray:  
                sid = qsec.sid  
                securities[sid] = this.GetOrCreateSecurity(qsec)  
                pass  
            return securities.values()  
        except:  
            log.error("FrameworkBase.GetOrCreateSecuritySecurities() error")  
            return {}  
        pass

Please note that I DO NOT ACTUALLY CALL THIS METHOD ANYWHERE. but the sandboxing doesn't like that I am trying to access a .sid property anyway.

how can I work around this?

4 responses

Jason Swearingen

Apr 18, 2014

i tried using hasattr() / getattr() but those are also prohibited by the sandbox

Jason Swearingen

Apr 19, 2014

if i'm not clear, here is the culprit line:

sid = qsec.sid

accessing a .sid property causes this to fail building, even though this function is not used at all.

Jason Swearingen

Apr 19, 2014

assuming this takes a long time to fix, here is my workaround: (force user to pass (sid,qsec) tuples)

    def _getOrCreateSecurities(this,qsecArray):  
        '''pass in an array of quantopian sid/sec tuples  (ex:  [(24,sid(24)),(3113,sid(3113))])  
        and returns an array of unique security objects wrapping them.   duplicate sids are ignored'''

        securities = {}

        for sid, qsec in qsecArray:  
            #sid = qsec.sid  
            securities[sid] = this._getOrCreateSecurity(sid,qsec)  
            pass

        return securities.values()

Alisa Deychman

Apr 21, 2014

Hi Jason,

We parse the code prior to execution to discover the SIDs and queue up the correct data for your simulation. Unfortunately, this means that dynamic variables cannot be used in sid() and your code will fail in the initial validation stage. To use the function, you need to explicitly pass in a static variable.

Alisa

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