Cross-version extension modules?

Pieter Claerhout Pieter.Claerhout at
Wed Jan 28 11:44:30 CET 2004

Normally, it doesn't change between micro versions.


pieter claerhout | product support prinergy | tel: +32 2 352 2511 |
pieter.claerhout at |


-----Original Message-----
From: Peter Astrand [mailto:peter at] 
Sent: 28 January 2004 11:43
To: python-list at
Subject: RE: Cross-version extension modules?

On Wed, 28 Jan 2004, Pieter Claerhout wrote:

> extension modules in Python are always linked to a specific version of
> Python. You might perform some tricks with writing a pure Python module
> about your extension that, based on the version of the python interpreter,
> loads a different version of your extension. This is e.g. the way the
> drivers for SapDB work.

Thanks. Is PYTHON_API_VERSION guaranteed to increase only when the Python 
major or minor version increases, or can it change between micro versions 
as well?

> -----Original Message-----
> From: Peter Astrand [mailto:peter at] 
> Sent: 28 January 2004 10:40
> To: python-list at
> Subject: Cross-version extension modules?
> If I build a extension module with Python 2.2 and then loads it with 2.3, 
> I get:
> RuntimeWarning: Python C API version mismatch for module _foo: This
> Python has API version 1012, module _foo has version 1011.
> How fatal is this? Is it safe to use the module anyway? If not, is it
> possible to build the module differently, so that it actually is safe to
> use it with different versions of Python?

Peter Åstrand
Teknikringen 3		Phone: +46-13-21 46 00
583 30 Linköping


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