How to fix auto-completion of imported Python VIM modules?

Question

Python

Good afternoon. Faced the problem of auto-completion of some imported modules.
For example, the pyperclip module. I have VIM configured with JEDI (I write under python3 YouCompliteMe does not work under 3, but it seems to be arranged through jedi anyway). After the dot I get an addition error. Although the same webbrowser module gives a complete list without problems.
Tried with it in Sublime Text. Autocomplete doesn't work either. I tried with Anaconda later, I thought it would be better there - the same thing. Sees only PyCharm.
And so it often happens, modules that cannot be supplemented periodically fall.
With what it can be connected? Modules written incorrectly? Too complicated and jedi can't handle it? Are there any alternatives?