[RFC] Adding alias command to ease supporting Python 2 and 3.

[Naoki INADA]

Hi, all.

Sadly, if_python and if_python3 is exclusive on Linux.
Writing plugin supporting both is difficult.

I found jedi-vim (https://github.com/davidhalter/jedi-vim ) supports both of
python 2 and 3.
https://github.com/davidhalter/jedi-vim/blob/master/autoload/jedi.vim#L162


Could vim have such alias command by default to ease writing such plugins?

if has('python')
    command! -nargs=1 pythonx python <args>
    command! -nargs=1 pyfilex pyfile <args>
    let g:has_pythonx=1
elseif has('python3')
    command! -nargs=1 pythonx python3 <args>
    command! -nargs=1 pyfilex py3file <args>
    let g:has_pythonx=1
else
    let g:has_pythonx=0
end

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