Solved
CREOSON: What's the hidden purpose that I don't understand?
I tried equivalent functions listed in the manual https://creopyson.readthedocs.io/en/latest/modules.html for example:
- Called through a client session : c.drawing_get_sheet_format(1)
- Called from Creopyson module : creopyson.drawing.get_sheet_format(c,1)
And I found that they return the same result. Please ignore the specific example of "get_sheet_format"
my question is : why there are two ways to call the same function?

