How to take screen number?

[ymd-h]

Thank you for your useful package.

I uses PyVirtualDisplay to visualize reinforcement learning environment (OpenAI Gym) on Google Corab, so that I need display number and screen number to set os.environ["DISPLAY"] = f":{display}.{screen}"

• Until version 0.2.5, screen number was Display.screen
• From version 1.0 to version 1.3, screen number was Display._obj.screen
• From version 1.3.1, screen number is Display._obj._screen

Are there any stable method to take screen number?
(or is it guaranteed that the screen number is always 0?)

[ponty]

I never used screen number. AFAIK it is only needed when you want to have multiple screens in a display. Is this what you need? Screen is always 0 in PyVirtualDisplay.
Environment is aleready set in start() like this:

os.environ["DISPLAY"] = f":{display}"

https://linux.die.net/man/1/xvfb
"By default, only screen 0 exists .."
"Xvfb :1 -screen 1 1600x1200x16
The server will listen for connections as server number 1, will have the default screen configuration (one screen, 1280x1024x8), and screen 1 will be depth 16 1600x1200. "

[ymd-h]

Hi, @ponty

Thanks for your answer!

Actually, I misunderstood detail of DISPLAY environment.
I could confirm by myself that the screen number is not necessary in this case.