[SciPy-Dev] scipy.test() failures '0.9.0.dev6635'

[Warren Weckesser]

Nils Wagner wrote:
> ======================================================================
> FAIL: test_mio.test_mat4_3d(<type 
> 'exceptions.DeprecationWarning'>, <functools.partial 
> object at 0x3081680
>   
>> , <StringIO.StringIO instance at 0x5096bd8>, {'a': array([[[ 0,  1,  2,  3],
>>     
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>    File 
> "/home/nwagner/local/lib64/python2.6/site-packages/nose-0.11.2.dev-py2.6.egg/nose/case.py", 
> line 18
> 3, in runTest
>      self.test(*self.arg)
>    File 
> "/home/nwagner/local/lib64/python2.6/site-packages/numpy/testing/utils.py", 
> line 982, in assert_rai
> ses
>      return nose.tools.assert_raises(*args,**kwargs)
> AssertionError: DeprecationWarning not raised
>      if hasattr(excClass,'__name__'): 'DeprecationWarning' 
> = excClass.'unittest'
>      else: 'DeprecationWarning' = str(excClass)
>   
>>>  raise self.failureException, "%s not raised" % 'DeprecationWarning'
>>>       
>
>
> ======================================================================
> FAIL: test_00_deprecation_warning 
> (test_basic.TestSolveHBanded)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>    File 
> "/home/nwagner/local/lib64/python2.6/site-packages/scipy/linalg/tests/test_basic.py", 
> line 262, in
> test_00_deprecation_warning
>      assert_raises(DeprecationWarning, solveh_banded, ab, 
> b)
>    File 
> "/home/nwagner/local/lib64/python2.6/site-packages/numpy/testing/utils.py", 
> line 982, in assert_rai
> ses
>      return nose.tools.assert_raises(*args,**kwargs)
> AssertionError: DeprecationWarning not raised
>      if hasattr(excClass,'__name__'): 'DeprecationWarning' 
> = excClass.'unittest'
>      else: 'DeprecationWarning' = str(excClass)
>   
>>>  raise self.failureException, "%s not raised" % 'DeprecationWarning'
>>>       
>
>   

These two errors are failures to raise a deprecation warning.
Does anyone else get these?

I wrote the test test_00_deprecation_warning in test_basic.py,
one of the linalg test modules.  In SciPy 0.8 and currently
in the trunk, the function solveh_banded is supposed to
raise a deprecation warning, because in the final release
of 0.9, its return value will be changed.

The tests for solveh_banded work for me, but they might
be taking advantage of behavior of nose that is not
reliable.  In effect, test_00_deprecation_warning assumes
that will execute the first call of solveh_banded, so
the deprecation warning will occur.  All the other test
functions include the line
    warnings.simplefilter('ignore', category=DeprecationWarning)
so they ignore the warning, even if it occurs.

Is there a way to reset whatever internal flag the
warnings module has that indicates that a warning has
already been issued once?

I see that the documentation for the warnings module
describes a 'catch_warnings' context manager, but
we need to be compatible with Python 2.4.  The 'with'
statement appears in 2.5.

Warren


P.S. It looks like handling of DeprecationWarnings will
require a little more work with Python 2.7, where they
are ignored by default.