Vim's Omnicompletion with Python just doesn't work

Question

I\'ve searched around for an hour, both on Stack Overflow and elsewhere. Alas! Please help. Vim\'s omnicompletion just doesn\'t work.

1. I have Vim 7.

Answer 1

I had a similar problem with omni completion not working. In my case it turned out that the minibufexpl.vim plugin was interfering with omni completion. Here is how I found out:

Normal keyword completion works. Omni complete does not work for any language, not just Python. omnifunc is set correctly. After I C-X C-O, nothing happens. I do ":py print globals()" and it is clear that the pythoncomplete was not loaded. I can ":call pythoncomplete#Complete(1, '')" and see it get loaded. To me this rules out it being a Vim issue. It seems something is interfering with keymapping or otherwise intercept the omni completion request. So I start to disable my plugins one by one. It turns out the culprit in my case is "minibufexpl". I have the Holgado version from github.

It looks like there are many open issues with MBE according to the issue tracker on github and there hasn't been any progress since early 2012. I am just going to disable it for now so I can use auto completion. Meanwhile I will just add the following to my vimrc to keep multiple modified buffers open at the same time and use a simple key sequence to cycle through them (MBE more intelligently select the buffers to cycle through but seems too heavy-handed for a simple problem):

set hidden
noremap  :bnext
noremap  :bprev