[Python-Dev] PEP 364, Transitioning to the Py3K standard library (original) (raw)

Brett Cannon brett at python.org
Thu Mar 8 01:39:46 CET 2007

On 3/7/07, Barry Warsaw <barry at python.org> wrote:

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On Mar 7, 2007, at 4:36 PM, Brett Cannon wrote: >> >> Third party package renaming is also supported, via several public >> >> interfaces accessible by any Python module. >> >> >> > >> > I guess a .pth file could install the mappings for the third-party >> > modules. >> >> How would that work? .pth files don't execute arbitrary Python code, > > It does through imports, though. I think it's important to import on demand only though.

And I agree.

I should probably make that clear in the PEP . IOW, "import email" should not by side-effect import all sub-modules just because there's a remapping involved. This actually would be quite easy to do, but it's one of the reasons why the Python 2.5 email package hack goes through so much trouble.

I am not suggesting that every rename be imported. All I am saying is that a .pth file could import pkg.old_names and that old_names module adds the mappings, that's all. It doesn't do anything that you are not proposing be done automatically.

-Brett

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