how to disable process spawn for autocompletion

python-mode creates buffer for autocompletion. I tried to switch from python.el to python-mode. But this behavior by default really bugs me, I got all autocompletation configured, and don't need any extra behavior

I could not figure out how to disable it from doc. I tried py-company-pycomplete-p but it just produces "file not found on startup" error. I tried py-auto-completion-mode-p it does nothing...