[issue32604] [subinterpreters] Expose the subinterpreters C-API in Python for testing use.

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

I marked bpo-39881 as a duplicate of this issue. It has two open PRs:

* PR 18817
* PR 19985

I changed their title to use bpo-32604.

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<https://bugs.python.org/issue32604>
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