[pygtk] how to transfer data between windows

[eric]

I use pygtk develop a program, demand is this:
The main window to pop up a sub-window, some of the data entered above, and
then click "OK" button, obtain input and processed into the database and
finally close it.

Now that is what I resolved:
2 windows each corresponding to a class, the main window create the child
window and  pass it's address into the child window , sub-window get user
input and calls the main window methods to perform data processing.

Such a solution did not feel good, is there any better way? For example:
transfer messages...etc
on windows, i can send messages between window, I would like to know what is
normal practice on pygtk.
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