[pypy-dev] 2.5 and 2.4 compatibility

[Michael Hudson]

2008/10/11 Ondrej Certik <ondrej at certik.cz>:
> On Mon, Sep 22, 2008 at 5:48 PM, Maciej Fijalkowski <fijall at gmail.com> wrote:
>> I'm working on 2.5 compatibility branch right now. Due to incompatible
>> changes, I suggest that we say we don't provide --pyversion option any
>> more and simply compile 2.5 compatible interpreter. I don't really see
>> benefits of providing 2.4 right now (after a brief discussion with
>> Armin).
>>
>> If anyone objects, please do that now.
>
> Just a curious question --- what kind of features are python2.4 only
> that doesn't work in python2.5? I though that except hashing,
> python2.5 is backwards compatible.

New style exceptions break a few things.  A few deprecated things were
removed -- OverflowWarning, for example.

The idea that Python 3 was the first release of Python that isn't
backwards compatible is slightly misleading :)

Cheers,
mwh