Transfer file name input from one .py to another

[mark.martinez2 at gmail.com]

How do I transfer the file name which is input in one .py (an MDI
parent frame in wxPython) to another .py (an MDI child frame)? The
parent gets the file name from the user via a file select dialog, but
the child frame is the one that needs to know what file it is working
with.

Thanks