It took me more than half a day to install it due to various strays (I did the old installation method halfway), but I was able to do it for the time being.
Basically, it's OK if you do Quick start in the following URL. http://tkf.github.io/emacs-jedi/latest/
I introduced the package with MELPA, but he also put in all the dependent packages without permission.
Once the package is in, add the following description to init.el
init.el
(add-hook 'python-mode-hook 'jedi:setup)
(setq jedi:complete-on-dot t)
Finally execute the following command from emacs
M-x jedi:install-server
This was all I could do.
The usability is very good. Satisfied.