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How to diagnose import error when importing from .so file?


Christian Heimes <christian at python.org> wrote:
> On 29/07/2020 15.34, Chris Green wrote:
> > I have some Python Gtk 2 code I'm trying to convert to Python
> > pygobject GTK 3.
> > 
> > However I'm stuck on an import statement that fails:-
> > 
> >     import pyscand
> > 
> > 
> > The error message is:-
> > 
> >     File "/usr/libexec/okimfputl.new/guicom.py", line 66, in <module>
> >         import pyscand
> >     ImportError: /usr/libexec/okimfpdrv/pyscand.so: undefined symbol: _Py_ZeroStruct
> > 
> > pyscand is a .so file so I fear I may be a bit stuffed unless I can
> > find the source code for it.  However any other ideas would be most
> > welcome.
> > 
> > In fact looking for this error it seems that is is a Python version
> > mismatch error and I need to recompile pyscand.so against Python 3. Is
> > there no way to sort of convert it to Python 3 without having the
> > source?
> 
> You are right. The extension module is compiled for Python 2.
> _Py_ZeroStruct is only available in Python 2. You need the C code for
> the extension module. and possibly even modify the C code to make the
> extension work with Python 3.
> 
Thanks for confirming, though it's not good news really as the chances
of getting the C code to recompile pyscand.so are minimal.  It's a
piece of code provided by OKI and I don't really think I'll be able to
get the code out of them.

Even more annoying is that most of what's in pyscand.so is constants,
there's only a couple of functions in there, so there's very little to
it really.

-- 
Chris Green
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