3.6 is technically EOL too, but I guess that's too soon?

@fsouza perhaps we should. I was just going by neovim/pynvim#492 at this point :]

Tests are updated and doc reviews addressed.

@bfredl, hi
With this commit I now see this on every startup -

Error detected while processing function provider#pythonx#Detect[1]..provider#pythonx#DetectByModule[1]..<SNR>28_get_python_executable_from_host_var:
line    1:
E605: Exception not caught: unsupported
Press ENTER or type command to continue

But I think my python is ok ?

## Python 3 provider (optional)
  - INFO: Using: g:python3_host_prog = "/usr/bin/python3.8"
  - INFO: Executable: /usr/bin/python3.8
  - INFO: Python version: 3.8.10
  - INFO: pynvim version: 0.4.3
  - OK: Latest pynvim is installed.

## Python virtualenv
  - OK: no $VIRTUAL_ENV

and

% python --version
Python 3.8.10
% python3 --version
Python 3.8.10

This seems to be from pythonx.vim -

function! s:get_python_executable_from_host_var(major_version) abort
  return expand(get(g:, 'python'.(a:major_version == 3 ? '3' : execute("throw 'unsupported'")).'_host_prog', ''), v:true)
endfunction

Do you know where the major_version could be getting set (to 2) ?
Is it a plugin I have that might be looking for python2 ?
Do I need to remove all python2 from my system ?
thx,
-m

ok, I think its the vimade plugin. I will look into that and work with that developer.
thx again for nvim,
-m

I am using "vim-plug" as my plugin manager. Since this PR was merged, I can't use :PlugInstall or :PlugUpdate with "vim-plug".

I found out that it is because has('python') raises an error the first time it is executed.

There may be a situation where all plugins that use has('python') are broken. :(

DEMO (mp4):

nvim -u NONE

You might need to clean out stale runtime files like this suggests. #17252 (comment)

I always build Neovim with CMAKE_EXTRA_FLAGS="-DCMAKE_INSTALL_PREFIX=$HOME/neovim" CMAKE_BUILD_TYPE=Release. I deleted $HOME/neovim and built it, and the problem was solved.

Thanks so much.
I also just now did a rm -rf /usr/local/share/nvim/runtime before a make install and no longer see the issue.
-m