[issue39824] Multi-phase extension module (PEP 489): don't call m_traverse, m_clear nor m_free before the module state is allocated

[STINNER Victor]

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

I updated PR 18738 to document the incompatible change in What's New In Python 3.9. Sadly, I expect that almost no third-party extension module implement the PEP 489 yet. So I expect that little or no third-party code is impacted in pratice.


> the module slots are then only needed if the module state actually gets populated, so we can safely skip them if it never even gets allocated

That's also my understanding.

> custom module subclasses should clean up like any other class instance

That sounds like a reasonable compromise to me.

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