How to install vim youcompleteme on ubuntu? How to fix the problem - 'YouCompleteMe unavailable: module 'collections' has no attribute 'Mapping''

Installing Vim-youcompleteme for Ubuntu

Where to put those of my functions, which can be imported as modules, on a specific path, so I can easily import them?

https://stackabuse.com/creating-and-importing-modules-in-python/

import sys

sys.path.append('~/???')