help needed debugging strange error with import

[smichr]

In https://github.com/sympy/sympy/pull/1653 there is what appears to be a fairly innocuous addition of a test that causes many unrelated tests to fail. I have no idea what is going on. You can see that the 2nd to last commit passes and then there are a bunch of failures in the last commit.

Any help would appreciated.

[smichr]

The failing report is at https://travis-ci.org/sympy/sympy/builds/3212369  and another one will be available when the tests finish again. There should be no difference, however, since I only squashed the last two commits together.

[Ronan Lamy]

Le 17/11/2012 02:09, smichr a �crit :

It's something to do with Function('gamma') somehow pre-empting the real
gamma function. The problem can easily be reproduced in master:

In [1]: Function('gamma')
Out[1]: sympy.core.function.gamma

In [2]: from sympy.core.tests.test_wester import test_J10

In [3]: test_J10()
---------------------------------------------------------------------------
AssertionError Traceback (most recent call last)
/home/ronan/dev/sympy/<ipython-input-3-fced9a91586b> in <module>()
----> 1 test_J10()

/home/ronan/dev/sympy/sympy/core/tests/test_wester.pyc in test_J10()
510 def test_J10():
511 mu, nu = symbols('mu, nu', integer=True)
--> 512 assert assoc_legendre(nu, mu, 0) ==
2**mu*sqrt(pi)/gamma((nu-mu)/2+1)/gamma((-nu-mu+1)/2)
513
514 def test_J11():

AssertionError:

[Ronan Lamy]

Le 17/11/2012 04:04, Ronan Lamy a �crit :

Oh, I know what it is. assoc_legendre uses C.gamma. This is a live
instance of the problem with C.stuff that I described a few weeks ago:
https://groups.google.com/d/msg/sympy/g7KJ1N1XAA4/Gq1DBJuGAXUJ

[smichr]

Do you have any idea how what I am doing is triggering that failure? (and how to fix it?)

[Aaron Meurer]

Short-term fix: replace C.gamma with just gamma

Long-term fix: remove C.

Aaron Meurer

On Fri, Nov 16, 2012 at 10:11 PM, smichr <smi...@gmail.com> wrote:

Do you have any idea how what I am doing is triggering that failure? (and how to fix it?)

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[smichr]

Do you know why my change triggers this?

[Aaron Meurer]

Apparently it is your use of Function('gamma') (from https://github.com/sympy/sympy/pull/1653/files#L2R460 I guess).

Aaron Meurer

On Fri, Nov 16, 2012 at 10:35 PM, smichr <smi...@gmail.com> wrote:

Do you know why my change triggers this?

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[smichr]

OK, now I see the link (though I don't understand all the reasons it happens). Let's see how the tests go now.