Autocomplete ComboBox in PythonTkinter (original) (raw)

Autocomplete ComboBox in Python-Tkinter

Last Updated : 12 Jul, 2025

Prerequisites: Python GUI – tkinterThe Listbox widget is used to display a list of items from which a user can select a number of items. But have you ever wondered, how to return the list of possible results when a key is pressed? Let's see the following approach towards the same.Working of Program

• List consisting of words is initialized.
• Entry box and Listbox are created and are added to the root window.
• Bind function is used for event handling. Key release event is handled for an Entry field.
• When any key is pressed in the Entry, checkkey() function is called.
• checkkey() function then compares the entered string with existing list keywords and populates Listbox with matching keywords.
• Then this data is sent to update function which then updates the Listbox.

Below is the approach.

Python 1== `

from tkinter import *

Function for checking the

key pressed and updating

the listbox

def checkkey(event):

value = event.widget.get()
print(value)

# get data from l
if value == '':
    data = l
else:
    data = []
    for item in l:
        if value.lower() in item.lower():
            data.append(item)                

# update data in listbox
update(data)

def update(data):

# clear previous data
lb.delete(0, 'end')

# put new data
for item in data:
    lb.insert('end', item)

Driver code

l = ('C','C++','Java', 'Python','Perl', 'PHP','ASP','JS' )

root = Tk()

#creating text box e = Entry(root) e.pack() e.bind('', checkkey)

#creating list box lb = Listbox(root) lb.pack() update(l)

root.mainloop()

`

Output: