Completor

The Plug "maralla/completor" also supports language client-neovim.

For Python User, the following code can be integrated.

Plug 'maralla/completor.vim'
let g:completor_refresh_always = 0 "avoid flickering
let g:completor_python_omni_trigger = ".*"
set formatexpr=LanguageClient_textDocument_rangeFormatting()
set omnifunc=LanguageClient#complete