[Python-Dev] Issue10271 - warnings.showwarning should allow any callable object - request commiter

[Terry Reedy]

On 7/21/2011 2:15 PM, Brett Cannon wrote:

>
> It won't break any _existing_ code, but it could cause compatibility for
> _future_ code. Imagine I wrote some code for 3.2.2 where this change was
> backported and worked *only* with this fix. That would mean my code
> would fail in any Python 3.2.1 or older interpreter. That's simply not
> acceptable as that means that code would be magically busted for some
> versions of Python 3.2 but not all of them.

In other words, Python 3.2 is a fixed language, cpython3.2.z's are 
intended to be increasingly better implementations of that language, 
although regressions can and do happen (as with issue 12540).

-- 
Terry Jan Reedy