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Mon Mar 24 00:44:42 CET 2014 · https://mail.python.org/pipermail/python-dev/2014-March/133421.html

On Sun, 23 Mar 2014 21:43:14 +0100, Antoine Pitrou <solipsis at pitrou.net> wrote:
> On Sun, 23 Mar 2014 20:47:28 +0100 (CET)
> r.david.murray <python-checkins at python.org> wrote:
> > http://hg.python.org/cpython/rev/ec556e45641a
> > changeset:   89936:ec556e45641a
> > user:        R David Murray <rdmurray at bitdance.com>
> > date:        Sun Mar 23 15:08:43 2014 -0400
> > summary:
> >   #20145: assert[Raises|Warns]Regex now raise TypeError on bad regex.
> > 
> > Previously a non-string, non-regex second argument could cause the test
> > to always pass.
> 
> It seems like this would be useful to fix in 3.4 too.

You will note that the change got a porting note in What's New.  It will
only break tests (that are currently no-ops), not code, so I'd be fine
with backporting it, but the original issue did not call for that.

If we fix it in 3.4, should we fix it in 2.7 as well?

--David

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assert[Raises|Warns]Regex now raise TypeError on bad regex.