[Swig-user] swig for python3

[Pieter E. <pie...@gm...>]

Dear all,

When generating Python bindings using swig I can use python2, but not
python3. I use

> swig -c++ -py3 -python -Isrc/ oalib.i
> python3 setup.py build_ext

and get the following error.

oalib_wrap.cxx: In function ‘const char* pytype_string(PyObject*)’:
oalib_wrap.cxx:5615:32: error: ‘PyFile_Check’ was not declared in this scope
oalib_wrap.cxx:5617:32: error: ‘PyInstance_Check’ was not declared in this
scope
oalib_wrap.cxx: In function ‘void SWIG_InitializeModule(void*)’:
oalib_wrap.cxx:49038:21: warning: statement has no effect [-Wunused-value]
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1

The problem is the PyFile_Check object generated by SWIG which is not
present in Python3. How can I instruct swig to either generate proper code
for python3, or generate an error when using c++ code that leads to PyFile
objects?

With kind regards,
Pieter Eendebak