Mark Dickinson <dicki...@gmail.com> added the comment:
+1 for Benjamin's patch, having just been bitten by this exact problem.
I'm trying to do unit testing, checking both that a piece of code produces a
DeprecationWarning and that it gives the correct result, with something like:
with warnings.catch_warnings():
warnings.filterwarnings("ignore", category=DeprecationWarning)
self.assertEqual(my_func(my_args), expected_result)
with warnings.catch_warnings():
warnings.filterwarnings("error", category=DeprecationWarning)
self.assertRaises(DeprecationWarning, my_func, *my_args)
The first call still registers the warning, even though it's ignored, so the
second assertRaises fails. Benjamin's patch would seem to provide a way to fix
this.
Perhaps I'm missing an obvious better way to do this.
N.B. The above is a too simple version of the real problem: it actually works
as intended, for fragile reasons: the "ignore"d warning is registered on
__name__, while the "always"d warning ends up being registered on
unittest.case, so there's no conflict.
----------
nosy: +mark.dickinson
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<http://bugs.python.org/issue4180>
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