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It used to work when I used python2, but now I can't use ^X^O to complete function names.

I do have vim with -python and +python3 (on Ubuntu 16.04), but here is the error I get when trying Ctrl-X Ctrl-O:

Error: Required vim compiled with +python
E117: Unknown function : pythoncomplete#Complete
Press ENTER or type command to continue

How can I get a working python3-completion in Vim? Thanks a lot.

I don't want to use any completion plugin, since this is supposed to work with normal vim. I have looked at this question, but no answer helps.

EDIT:

Checking where omnifunc was defined with verbose set omnifunc?, it says /usr/share/vim/vim74/ftplugin/python.vim

As suggested by @ChristianBrabandt, when I set omnifunc to python3complete#Complete, it can complete a few stuff, like sys., but still doesn't work for other modules, e.g argparse. Why is that?

So a temporary fix is to set omnifunc in my ~/.vim/ftplugin/python.vim, unless anyone has a better suggestion?

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    pythoncomplete#Complete is for python2, you need to use python3complete#Complete. I think you must set either the 'omnifunc' or 'completefunc' option, I can't remember which one
    – Christian Brabandt
    Jan 30, 2018 at 13:24
  • Ah, you're right, it works better. Still does not complete everything though, so I edited my question.
    – PlasmaBinturong
    Jan 30, 2018 at 13:40

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