Deoplete is the abbreviation of "dark powered neo-completion". It provides an asynchronous keyword completion system in the current buffer. To view the current options, please consult the documentation.

Note: deoplete requires Neovim(latest is recommended) with Python3 enabled. See requirements if you aren't sure whether you have this.

1. Extract the files and put them in your Neovim directory (usually $XDG_CONFIG_HOME/nvim/).
2. Execute the :UpdateRemotePlugins and restart Neovim.
3. Call deoplete#enable() or set "let g:deoplete#enable_at_startup = 1" in your init.vim

For vim-plug

function! DoRemote(arg)
  UpdateRemotePlugins
endfunction
Plug 'Shougo/deoplete.nvim', { 'do': function('DoRemote') }

For dein.vim

call dein#add('Shougo/deoplete.nvim')

deoplete requires Neovim with if_python3. If :echo has("python3") returns 1, then you're done; otherwise, see below.

You can enable Python3 interface with pip:

pip3 install neovim

If you want to read the Neovim-python/python3 interface install documentation, you should read :help nvim-python and the Wiki. https://github.com/zchee/deoplete-jedi/wiki/Setting-up-Python-for-Neovim

" Use deoplete.
let g:deoplete#enable_at_startup = 1