Access dimensions of job from python

I wrote a little subroutine to create repeated parts in an array fashion, example cut 10 along X spaced by a value and 5 along Y for 50 parts without stopping(poor man's nesting)

I however want to migrate this all to python so I can call named G-Code files (vs numbered files) without then having to be subs themselves also, since my sub takes the files as a parameter I can only pass numbers.

I have noticed that the preview has the dimensions of the job displayed.

How can I get access to those dimensions programmaticlly in python?


Thanks