I think it's a lot less common for authors of packages to put them on to PyPi vs CRAN (mostly due to the absolute mess of Python packaging) so it doesn't surpri

I think it's a lot less common for authors of packages to put them on to PyPi vs CRAN (mostly due to the absolute mess of Python packaging) so it doesn't surprise me that his searches turned up not much there. On GitHub there are those packages: https://github.com/search?q=poisson+regression https://github.com/search?q=poisson+regression I've not used Rcpp, but Pybind11 is pretty mature, and works well, so I'm not sure why he's saying it's under development; by the same measure there was an update to Rcpp last week, so that is too. He mentions Cython which allows you to compile Python code, but my main use case for that is exactly what he says - wrapping up C/C++ libraries, which is very easy in it. "Python is currently undergoing a transition from version 2.7 to 3.x. This will cause some disruption, but nothing too elaborate." This is pretty out of date; in Jetbrain's survey, 84% of devs had transitioned.