I want to get the highest and lowest world position( pos.Y of Highest point and lowest point for the whole scene.
Is there a quick method to get it apart from for looping all objects in the scene?

Sorry for basic question
First time building a plugin.
Have read through the Python Doc but cannot understand
how to make some Icon Buttons and Shortcut key so users can run some of my script with clicking the icon buttons and some of my script with press shortcut key in keyboard.

Any help would be appreciated