Steve Dower <steve.do...@python.org> added the comment:

The sitecustomize.py file is totally available, and the only limitation there 
is packages can't inject themselves into it on installation. And if you want to 
trigger it on a package import then you totally can (though there's *another* 
discussion about that being a bad idea).

.pth files really only satisfy the "run at startup because I'm a dependency of 
something that my user wants and don't make them opt-in to my changed 
behaviour", which I don't like :)

If encodings need to be available without an explicit import, sure, we can add 
a point for those. Import hooks can always be injected by a package __init__.py 
before the importer will try and resolve the module, so nothing is needed 
there. But having a PEP with specific use cases to argue about is the way to 
create new mechanisms here. I don't agree we need a solution before declaring 
that the old way should be avoided and will eventually be removed, provided we 
don't add noisy warnings until there's an alternative.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33944>
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