This is a plugin for the Palantir's Python Language Server (https://github.com/palantir/python-language-server)
It, requires Python 3.6 or newer.
Install into the same virtualenv as pyls itself.
pip install esc-ls
Depending on your editor, the configuration (found in a file called esc-ls.cfg in your workspace or a parent directory) should be roughly like this:
{
"enabled": True
}