Adding items to Listbox in Python Tkinter

Question

I would like my Listbox widget to be updated upon clicking of a button. However I encountered a logic error. When I click on the button, nothing happens. No errors at all.

listOfCompanies: [[1, ''], [2, '-'], [3, '@ASK TRAINING PTE. LTD.'], [4, 'AAIS'], [5, 'Ademco'], [6, 'Anacle']

def populatebox():
            listBox.insert("end", listOfCompanies)

btn = Button(self, text="Update list", command = lambda: populatebox())
btn.pack()

I don't believe that you don't get an error. listOfCompanies is a list which does not exist inside the function populatebox() so when calling it inside that function it returns an error NameError: name 'listOfCompanies' is not defined. So you are guaranteed to return an error with the code you provided us. — Ethan Field
– Ethan Field, Commented Oct 17, 2017 at 10:09
read-access to the list is possible even if the list is not defined within populatebox() - so Python is not going to complain about that — DonGru
– DonGru, Commented Oct 17, 2017 at 10:15
@DonGru The list doesn't exist, full stop. She has declared it incorrectly. — Ethan Field
– Ethan Field, Commented Oct 17, 2017 at 10:17

Ethan Field · Accepted Answer · 2017-10-17 10:16:10Z

5

If you're looking to just insert every tuple into the Listbox from the list as they are without separating out the tuple then there are two major changes.

First you cannot declare a list as list: [1, 2, 3, ...], it must be list = [1, 2, 3, ...].

Secondly, you are currently attempting to insert the entire list onto one entry in the Listbox. You should instead iterate over them, see below for an example:

from tkinter import *

root = Tk()

listBox = Listbox(root)
listBox.pack()

listOfCompanies = [[1, ''], [2, '-'], [3, '@ASK TRAINING PTE. LTD.'], [4, 'AAIS'], [5, 'Ademco'], [6, 'Anacle']]

def populatebox():
    for i in listOfCompanies:
        listBox.insert("end", i)

btn = Button(root, text="Update list", command = lambda: populatebox())
btn.pack()

answered Oct 17, 2017 at 10:16

Ethan Field

4,7464 gold badges24 silver badges43 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Sarah Collins Over a year ago

Actually, I got the list from reading a .csv file however I did not include it in the original post as I thought it would make the post too lengthy and it was irrelevant. Either way, I tried placing the code you've suggested and similarly, it gave no output and no error when I clicked on the button.

Ethan Field Over a year ago

If this solution answers your question, please can you mark it as accepted for future users.

Collectives™ on Stack Overflow

Adding items to Listbox in Python Tkinter

1 Answer 1

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related