[Python-Dev] Re: my plans for subinterpreters (and a per-interpreter GIL)

On Tue, Dec 14, 2021 at 10:12 AM Eric Snow <ericsnowcurrently@gmail.com> wrote:

* it is fully backward compatible and the C-API is essentially unaffected

Hmm, this is a little misleading. It will definitely be backward incompatible for extension modules that don't work under multiple subinterpreters (or rely on the GIL to protect global state). Hence that other thread I started. :) -eric