Python Tkinter Listbox Unbind the Default Selection
Question: I find this feature of automatic selection to item index 0 in the Listbox a
nuisance. In my script, I have 3 listboxes called lb1,lb2 and lb3. If user
selects any items on lb2 or lb3, I intend to pop up a MessageBox to ask the
user to only select items from lb1. However, due to the automatic selection
items index 0 in lb2 and lb3, whenever I click on item in lb1, the MessageBox
also appears.

Question: How can I disable the initial selection of item index 0 in ListBox?

This is part of my script to call MessageBox if user selects items from lb2 or
lb3:

    
    
    if lb2.get(ACTIVE) or lb3.get(ACTIVE):
        tkMessageBox.showwarning("Warning","Please select from lb1 ")
    

Please advice! Any other ways to perform the intended action will also do.
Thanks.


Answer: What OS are you using?

If I execute this code (taken from the Tkinter Listbox reference page on
effbot.org) on Windows, there is no default selection made in the listbox.

    
    
    from Tkinter import *
    master=Tk()
    listbox=Listbox(master)
    listbox.pack()
    for item in ['one','two','three','four']:
        listbox.insert(END, item)
    

**EDIT :** OK, now I see what you're asking. You want to check the
`curselection` method first before trying to use `get(ACTIVE)`.

    
    
    if listbox.curselection():
        item = listbox.get(ACTIVE)
    

Does that help? You can find a [more complete example
here](http://www.tkdocs.com/tutorial/morewidgets.html).

