Tkinter Python listbox

Question

I am a new python user. I'm used to programing on matlab. I've trying to make a simple GUI with Tkinter pack, but I'm having some problems with that. I had already read and searched what i want but I couldn't develop it.

What I'm trying to do is to make a listbox and when I choose one (or more) options the index be returned (and stored) as a variable (array or vector) that could be used to indexing another array.

The best result I got was a listbox where the index were printed, but not stored as a variable (at least it hasn't been shows in the variables list)

I'm using spyder (anaconda).

I tryied a lot of codes and I don't have this anymore.

Sorry for the dumb question. I guess I still thinking in a Matlab way to write

Nelson · Accepted Answer · 2017-07-07 23:47:08Z

1

To keep this application simple, your best option is to get the listbox selection when you want to do something with it:

from tkinter import Tk, Listbox, MULTIPLE, END, Button

def doStuff():
    selected = lb.curselection()
    if selected: # only do stuff if user made a selection
        print(selected)
        for index in selected:
            print(lb.get(index)) # how you get the value of the selection from a listbox

def clear(lb):
    lb.select_clear(0, END) # unselect all

root = Tk()

lb = Listbox(root, selectmode=MULTIPLE) # create Listbox
for n in range(5): lb.insert(END, n) # put nums 0-4 in listbox
lb.pack() # put listbox on window

# notice no parentheses on the function name doStuff
doStuffBtn = Button(root, text='Do Stuff', command=doStuff)
doStuffBtn.pack()

# if you need to add parameters to a function call in the button, use lambda like this
clearBtn = Button(root, text='Clear', command=lambda: clear(lb))
clearBtn.pack()

root.mainloop()

I've also added a button to clear the listbox selection because you cannot unselect items by default.

edited Jul 7, 2017 at 23:47

answered Jul 7, 2017 at 18:32

Nelson

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1 Comment

GabrielBR Over a year ago

Thanks so much. your code solve my problems. Now I got how this combination of button and listbox works. I'm used to build GUI with GUIDE toolbox from Matlab where the functions of the widgets are ready to use without configuring it.

auden · Accepted Answer · 2017-07-07 20:03:01Z

0

First, import tkinter, then, create the listbox. Then, you can use curselection to get the contents of the listbox.

import tkinter as tk
root = tk.Tk() #creates the window
myListbox = tk.Listbox(root, select=multiple) #allows you to select multiple things
contentsOfMyListbox = myListbox.curselection(myListbox) #stores selected stuff in tuple

See the documentation here.

edited Jul 7, 2017 at 20:03

answered Jul 6, 2017 at 20:34

auden

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1 Comment

Nelson Over a year ago

curselection is a method of the Listbox class and must be called like <Listbox object>.curselection()

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