[Python-Dev] multiple interpreters and extension modules (original) (raw)

"Martin v. Löwis" martin at v.loewis.de
Sat Dec 30 02:19:12 CET 2006

Jeremy Kloth schrieb:

1) is subclassing Python classes in C as a static type supported? Even if they would be declared on the heap, they would be bound to the first loaded Python class.

As you found out: no, this isn't supported.

To work around, you can wrap the extension module with Python module which invokes an explicit module initialization function; you then need to lookup the subclasses dynamically (going through thread_state->interp->modules).

As to question 2, I'm in the process of prototyping that approach to see if it is feasible in our code and if so, (and people find it useful) I'll attempt to write a PEP for that feature.

I'd like to see the module initialization/finalization be redone for Python 3, in particular with explicit finalization procedures. If Python 3 still supports multiple interpreters, this aspect should be taken into account. Whether there is any chance to add the PEP to 2.x, I don't know - it needs to be written first.

Regards, Martin

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