How to solve an UCS2-UCS4 python-cython incompatibility

[Uri Elias]

Hi all,

I'm running into a cython-unicode problem which I hope you can help me with - 

I'm trying to compile with cython a python module which works alot with unicode objects.

I'm working on Ubuntu 12.04 32bit, (on a VM on a Win7 64bit host if it has any importance), I'm using Py2.5.4 (can't change that) which I've installed side-by-side with the provided Py2.7.3 (and soft-linked /usr/bin/python to /usr/bin/python2.5), and Cython 19.02 (current one). I'm compiling with no special flags.

Now, as compiling goes seemingly OK, when I open a Py (same 2.5.4) and try to import the resulting .so, I get a PyUnicodeUCS2 type error. That is supposed to mean, as I understand, that the SO was compiled on a python configured with UCS4, and imported to python configured with UCS2. BUT It's the same python I compiled on imported..

Can someone enlighten me with what's going on and what I can do with it?

I'll be happy to provide more details if I wasn't clear enough.

Thanks a lot..

[Chris Barker]

Uri,

How are you compiling the extension?

Hopefully with distutils -- in which cae, do make sure you are running distutils (i.e. the setup.py file) with the python you think you are.

-CHB

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[Uri Elias]

Yes, with distutils  - setup.py, smth like

from distutils.core import setup
from Cython.Build import cythonize

setup(
  name = 'Hello world app',
  ext_modules = cythonize("hello.pyx"),
)

(thats from docs.Cython) but with distutlis.extension.Extension and Cython.Distutile.build_ext rather than cythonize (does it matter? what is actually the difference?).

then with the command $ python setup.py build_ext --inplace

Now, typing $ python  gives me a Python 2.5.4 prompt, so I believe this is the case for the above command too.

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