How to declare controls and objects globally?

I try to declare variable in class and call it from a script file as shown below:

In class_objects.py file:

Class MyObjects:

  user_name_box = Sys.Process("myapp").VBObject("login").VBObject("txtUserName")

In my script file:

import class_objects

def test():

  mo = class_objects.MyObjects()

  mo.user_name_box.SetText("test")

And it works.

Do you have any input for doing this way? Thanks.