listbox binding..what is the current selection?

Rex Macey xer0925 at
Wed Mar 6 01:54:45 CET 2013

I have a listbox with two strings "Fixed" and "Random". It is bound by the following statement: 

Here's the beginning of the set_lengthtype code:

def set_lengthtype(event=None): 

The print(s) statement is for debugging.  If 'Random' was selected and the user clicks 'Fixed',  then Random will print.  I would like to know what the user just selected, not what was selected before the user clicked.  How can I determine the current selection? Thanks.  

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