Push or simulate a Alt+Tab event to keyboard

[Dario Lesca <d lesca solinos it>]

Hi everybody, this is my first message on this ML, but I am a Gnome
user since always.

Now I want produce a little personal gnome shell extension with this
features:

A little button on top bar, or somewhere, when pressing this button,
push a Alt+Tab event and focus windows swap like I press the ALT+TAB
button

What internal gnome shell function I must use?
There is some example to copy for do that?

For now I have found this method via a little Phyton script

#!/usr/bin/python3
import pyautogui
pyautogui.hotkey('alt', 'tab')

But in order to let it work, must install on Fedora 31 some extra
package[1] (python3-tkinter, python3-devel, scrot, ecc) for use
pyautogui.hotkey()

Then before to do that on other my system, I try to ask you if there is
an internal gnome shell function to call for do same thing.

Many thanks for your attention and patient.

[1] - 
https://stackoverflow.com/questions/49231756/how-to-install-pyautogui-on-fedora-27


-- 
Dario Lesca
(inviato dal mio Linux Fedora 31 Workstation)