Install Vim via Homebrew with Python AND Python3 Support

Question

I would like to enable Python auto-completion in Vim so maybe this is a non-issue. This is what I've observed:

First, Virtual Environments provides the ability to assign an interpreter on a per-project basis. The assumption being both Python 2.x AND Python 3.x could potentially be used.

I've installed both python 2.x and python3 - no issues.

While installing Vim via Homebrew, no matter what happens only support support for one interpreter is compiled in:

/usr/local/bin/vim --version
...

+python3 -python, or
-python3 +python

Q: for the purposes of achieving python auto-completion:

Is this a real problem?
If it is, what's the solution?

If you want autocompletion for both Python 2 and Python 3 it can be an issue. Then again, you might be able to find a plugin that does autocompletion without relying on the embedded Python interpreter. — lcd047
– lcd047, Commented May 25, 2015 at 18:47

Cometsong · Accepted Answer · 2015-05-30 18:25:28Z

16

Vim compiled with both, or with 'dynamic' is only available on Windows versions. Mac/*nix/etc can only use one version of Python.

My way around this was to compile two different vims, one with each Python version, and then create a version check in my .vimrc to be co-compatible with the two of them.

if has('python')
  let g:jedi#force_py_version = 2
  let g:syntastic_python_python_exec = 'python2'
  let g:pymode_python = 'python2'
elseif has('python3')
  let g:jedi#force_py_version = 3
  let g:syntastic_python_python_exec = 'python3'
  let g:pymode_python = 'python3'
else
  let g:loaded_jedi = 1
endif

Modifying this with whatever python-specific plugins or function you have installed, of course.

edited May 30, 2015 at 18:25

answered May 28, 2015 at 20:04

Cometsong

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3 Comments

todd_dsm Over a year ago

Brilliant; I wish I could give you more than 1 up-vote. Thank you.

A S Over a year ago

I think this is outdated: it seems, one can compile Vim with both --enable-pythoninterp=dynamic and --enable-python3interp=dynamic on macOS nowadays.

Cometsong Over a year ago

@A-S True in the later versions of vim. The snippet I put here is for older versions. I still have it in my base vim setup though, as several of the servers I work on only have oooold versions and configurations. Some are still ancient Linux versions as they are production servers and are forbidden from changing. "if it ain't broken, don't fix it" kind of perspective. :|

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