Neil Schemenauer wrote:
> On 2019-05-31, Simon Cross wrote:
> >   As the maintainer of Genshi, one the libraries
> > affected by the CodeType and
> >  similar changes, I thought I could add a users perspective to the
> >  discussion: [...]
> 
> Thanks.  I think this change to PyCode_New() could have been handled
> a bit better.  Couldn't we introduce a new CPP define that enables
> the revised API of PyCode_New()?  For 3.8 extensions, they would get
> the backwards compatible API (and a warning) unless they set the
> define. For 3.9, we would enable the new API by default.  That gives
> 3rd party extensions one release cycle to catch up to the change.
> Perhaps something similar could be done for CodeType called from
> within Python code.
> 
> In this case, it seems that introducing a new API like
> PyCode_NewEx() is not the way.  However, just changing an API like
> that is not very friendly to 3rd party extensions, even if we don't
> claim it is a stable API.  For me, change to PyCode_New() means that
> I can't test the 3.8.0b1 because the 3rd party extensions I rely on
> don't compile with it. Normally I try to test my application code
> with the latest alpha and beta releases.
> 
> It would be great if we had a system that did CI testing with the
> top PyPI modules.  E.g. pull the latest versions of the top 100 PyPI
> modules and test them with the latest CPython branch.  With that, at
> least we would know what the fallout would be from some incompatible
> CPython change.  Setting that system up would be a fair amounnt of
> work but I suspect the PSF could fund someone who puts together a
> plan to do it.  Such a system would be even more useful if we start
> moving stuff out of stdlib into PyPI.

This has been brought up multiple times before and no one every objects, it's 
just a time/effort problem nearly every time. For the PSF to fund it someone 
would have to write up a grant proposal and submit it.
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