Vim does not have auto-complete; any completion must be explicitly triggered with <C-n>
or a <C-x>
combination.
What you experience is probably a plugin, possibly related to Python. Check what you've installed, read its documentation, and follow the instructions there how to turn it off. It is probably implemented with some autocmds, which can be shut down via :autocmd! AutoCmdGroupNameHere
, but there should be a configuration variable for it.