except python xlib manual seem have no doc or tutorial on web.
for example I want to know the method and property under display.Display.screen() like screen.root.grab_key(i saw them in tinywm py code) so I read python-xlib doc ,but python-xlib doc content is too few,even it not mention about any api reference

If you try pydoc or dir(), help() this is the output:

uv run python -m pydoc Xlib.display.Display.screen

Help on function screen in Xlib.display.Display:

Xlib.display.Display.screen = screen(self, sno=None)

help(Display.screen):

Help on function screen in module Xlib.display:

screen(self, sno=None)

Where are the method and property go (like screen.root and screen.root.grab_key...)?