If you are interested, such non-determinism stems from code like
for _ in A_DICTIONARY.items():
...
where the datastructure (or something else) does not preserve order,
but just orders by some transient (wrt restart of the interpreter)
value like hash or memory address.
On 7 September 2013 17:43, Stefan Krastanov <[email protected]> wrote:
> You are testing whether the result from simplify is structurally the
> same as a predefined answer, but simplify does not guarantee that it
> will give the same result each time.
>
> It is giving mathematically equivalent result, it just decided that it
> should factor out a minus sign.
>
> The simplest solution would be to rewrite tests of the form:
>
>>>> a.simplify()
> b
>
> into
>
>>> (a-b).simplify()
> 0
>
> but this is somewhat ugly, especially for doctests which should be
> more of a documentation tool. However, if a doctest is so complicated
> it might be a good idea to move it to a test file and write a new,
> simpler doctest.
>
> On 7 September 2013 16:52, Sachin Joglekar <[email protected]> wrote:
>> I am currently working on a PR to modify the mechanics core - #2412. The
>> Travis build seems to be failing for a couple of doctests in the
>> doc/src/modules/physics/mechanics/bicycle_example.rst file. Have a look here
>> - https://travis-ci.org/sympy/sympy/jobs/11069792
>> The problem is, neither Gilbert nor I are able to figure out why. The
>> weirder stuff is, doing
>> ./bin/doctest -n doc/src/modules/physics/mechanics/bicycle_example.rst
>> on my machine gives no error once, and 5 errors the next time I run it
>> (Without altering any code in the meantime). Same goes for the command
>> without the '-n' parameter.
>> Can anybody help us out with this? The PR is stuck at this issue, and we
>> need to resolve it soon. (I have attached a file with the errors shown)
>>
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