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posted Aug 23, 2012

This is a common place to share some generally useful snippets of code you wrote. Note that indenting in code snippets is broken currently, but we are working on a fix!

Over time we will move these helper functions into the library so that you can just use them without having to copy them.

This is from Andrew Parker, instead of ordering a fixed number of shares, it orders shares for a fixed number of cash.

def order_in_cash(data, security, cash):  
   shares = cash // data[security].price  
   if shares < 0:  
       shares += 1  
   # to fix python's flooring of negative integer division.  
   order(security, shares)

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1 response

Andrew Parker

Aug 23, 2012

if you do use that snippet, tab over lines 2,3, and 6 once, and then tab over lines 4 (and optionally 5) twice. Due to significant whitespace in python, the helper function won't work properly otherwise.

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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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