Jupyter kernel installation independent of Python version number?

[Rob Blackwell]

I'm trying to use Jupyter with a Julia language kernel on FreeBSD 11.1 stable. The IJulia installer assumes that kernels are installed like this, but that doesn't seem to be the case on FreeBSD:

                jupyter -kernelspec <stuff>

As a workaround, I can use

                jupyter -kernelspec-3.6 <stuff>

or

                jupyter-kernelspec-3.6 <stuff>

But both of these require me to know the python version number (3.6) and this doesn't play well with automated installers such as IJulia build.jl. See https://github.com/JuliaLang/IJulia.jl/pull/606

Is there a way to install Python / Jupyter on FreeBSD where I get Python3.6, but I don't have to specify the version to Jupyter please? I suspect that in my naivety, there is a better way to install Python and Jupyter that specifies the required default version? In general, does anybody have any introductory material or tips on setting up a modern Python3 development environment with Jupyter, Matplotlib etc on FreeBSD post FLAVORs please?

Thanks

Rob.