Python 3.x builds with Py_LIMITED_API

[cas--]

To ease maintaining and distributing the Python bindings I would suggest looking into being able to build 3.x bindings using the Py_LIMITED_API: https://docs.python.org/3/c-api/stable.html

I have done very little research on this but do you think this is possible @arvidn?

[arvidn]

The only hurdle I can imagine would be if boost.python use calls not part of this subset

[cas--]

Hmm so it seems boost.python has the same issues as pybind11 with usage of PyTuple_SET_ITEM

Boost.python issue: boostorg/python#221

I shall close this for now.