annoying doctest problem

[gordianknot1981 at gmail.com]

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> My recommendation is to use doctest to test the code samples that 
> naturally occur in your docstrings, but not to use it as a 
> general-purpose testing tool.  It has too many limitations and quirks, 
> and if you're going to write separate test methods anyway, why not just 
> write actual code?
> 
> More detail here: 
> http://nedbatchelder.com/blog/200811/things_i_dont_like_about_doctest.html
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"Docstrings may be good ways to explain what code does, but explaining and testing are two different tasks"......That's really to the point, and make sense. anyway, thanks for your article I benefit a lot from it.