On 1/11/15 11:20 PM, gordianknot1981 at gmail.com wrote: >> It failed with an unknown reason that evaluate two expected equal value but got an unexpected result! I'm struggling with this problem for a long time. Did I did something wrong? And how do I to fix it? >> any help is appreciated. :) > 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 -- Ned Batchelder, http://nedbatchelder.com