[Python-Dev] Improvements for Porting C Extension from 2 to 3 (original) (raw)

M.-A. Lemburg mal at egenix.com
Thu Mar 3 10:15:00 CET 2011

Sümer Cip wrote:

Hi,

While porting a C extension from 2 to 3, I realized that there are some general cases which can be automated. For example, for my specific application (yappi - http://code.google.com/p/yappi/), all I need to do is following things: 1) define PyModuleDef 2) change PyStringASSTRING calls to PyUnicodeAsString

Aside: Please don't use private APIs in Python extensions. Esp. the above Unicode API is likely going to be phased out.

You're better off, using PyUnicode_AsUTF8String() instead and then leaving the PyString_AS_STRING() macro in place.

3) change module init code a little.

It occurred to me all these kind of standart changes can be automated via a script. Not sure on the usability of this however, because of my limited knowledge on the area. Does such a tool worth being implemented?

I'm not sure whether you can really automate this: The change from 8-bit strings to Unicode support usually requires reconsidering whether you're dealing with plain text, encoded text data or binary data.

However, a guide of what to replace and how to change the code would probably help a lot. Please share your thoughts on the python-porting mailint list and/or add to these wiki pages:

http://wiki.python.org/moin/PortingToPy3k http://wiki.python.org/moin/PortingExtensionModulesToPy3k

Thanks,

Marc-Andre Lemburg eGenix.com

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