[Zope-dev] Python 2.7 disables deprecation warnings by default

[Marius Gedminas]

On Wed, Jul 07, 2010 at 02:43:14PM +0200, Hanno Schlichting wrote:
> On Wed, Jul 7, 2010 at 12:55 PM, Jim Fulton <jim at zope.com> wrote:
> > I'm not sure what the best way to handle this is.  My initial thought
> > is that all test runners should enable deprecations by default.  This
> > seems hard to enforce.
> 
> What about letting the testrunner (zope.testing / zope.testrunner)
> enable deprecation warnings by default, but add a command line switch
> to disable them or use the Python default?

+1

Although tests that check for functions emitting DeprecationWarnings
should not rely on this; they should explicitly ensure DeprecationWarnings
are not filtered away in their own setup.

> > Individual test modules can do this, but I'm uncomfortable having a
> > test script make a global setting like this and the warning module
> > doesn't seem to provide a way to capture the current state so it can
> > be reset after running tests.

There's the warnings.catch_warnings context manager (since Python 2.6):
http://docs.python.org/library/warnings.html#testing-warnings

I'm sure it can be backported to older Python versions, or the test
setUp/tearDown can fiddle with warnings.filters[:] directly.

Marius Gedminas
-- 
http://pov.lt/ -- Zope 3 consulting and development
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