Re: [Matplotlib-users] testing issue involving matplotlib

[Benjamin R. <ben...@ou...>]

Thanks for the update.


On Tue, Jun 10, 2014 at 6:46 AM, John Evans <joh...@gm...>
wrote:

> Just to close the loop on this, I figured out that the issue was minimally
> reproduced if the "import matplotlib.pyplot" line was replaced with just
> "import six".  It was reported to the six package developers and the
> problem was resolved with the 1.7.0 release of six.
>
>
> On Wed, Apr 16, 2014 at 12:37 PM, Benjamin Root <ben...@ou...> wrote:
>
>> Hmmm, it isn't the same, but I wonder if it is related to the oddities
>> around https://github.com/matplotlib/matplotlib/pull/2925 . What I mean
>> is that in that case, none of our unit tests caught the problem, even
>> though it should have. In your case, your unit tests is catching a similar
>> problem, but there is no obvious reason why there should be a problem.
>>
>> Now, technically speaking, in your case, there is a bug in the unittest
>> package (values() is an iterator in py3k rather than a list), but I
>> wouldn't know why that dictionary would change in the first place.
>>
>>
>>
>> On Mon, Apr 14, 2014 at 2:54 PM, John Evans <joh...@gm...>
>> wrote:
>>
>>> Helllo, I'm seeing a strange issue when running unittests on python3.3
>>> and python3.4 that somehow involves matplotlib.  My code has a somewhat
>>> complicated setup, but I think I've boiled the issue down to the following
>>> reproduction steps
>>>
>>>
>>> import unittest
>>> import warnings
>>>
>>> import matplotlib.pyplot
>>>
>>> class TestMe(unittest.TestCase):
>>>     def test_warn(self):
>>>         with self.assertWarns(UserWarning):
>>>             warnings.warn("a warning", UserWarning)
>>>
>>> if __name__ == "__main__":
>>>     unittest.main()
>>>
>>>
>>> It looks like it should pass, but it errors as follows
>>>
>>> E
>>> ======================================================================
>>> ERROR: test_warn (__main__.TestMe)
>>> ----------------------------------------------------------------------
>>> Traceback (most recent call last):
>>>   File "/homes/5/jevans/Downloads/testit.py", line 8, in test_warn
>>>     with self.assertWarns(UserWarning):
>>>   File
>>> "/space/getafix/1/users/jevans/anaconda/envs/py3k/lib/python3.3/unittest/case.py",
>>> line 177, in __enter__
>>>     for v in sys.modules.values():
>>> RuntimeError: dictionary changed size during iteration
>>>
>>> ----------------------------------------------------------------------
>>> Ran 1 test in 0.002
>>>
>>>
>>> If the matplotlib import is changed to just
>>>
>>> import matlotlib
>>>
>>> or if the matplotlib import is commented out altogether, it then passes.
>>>  I'm seeing the behavior on Anaconda with python 3.3 and matplotlib 1.3.1
>>> on both mac and linux, but also with MacPorts with pythons 3.3 and 3.4,
>>> matplotlib 1.3.1.  All seems fine with a  Fedora 20 laptop with python 3.3
>>> and also matplotlib 1.3.1.
>>>
>>>
>>> --
>>> John Evans
>>>
>>>
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>>>
>>
>
>
> --
> John Evans
>