How to get SharePoint (globa) user with Office365-REST-Python

Question

I'm using Office365-REST-Python to work with SharePoint Online and i know how to reach or ask about site (example_site) user:

from office365.runtime.auth.authentication_context import AuthenticationContext
from office365.sharepoint.client_context import ClientContext

site_url = 'https://sharepoint.com/sites/example_site/'
site_user = 'user'
site_secret = 'secret'

context_auth = AuthenticationContext(url=site_url)
context_auth.acquire_token_for_app(site_user, site_secret)
context = ClientContext(site_url, context_auth)

web = context.web
context .load(web)

users = web.site_users
ctx.load(users)
ctx.execute_query()

But the question is how to ask about any SharePoint user (globally not only site user).

Thanks in advance.