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Autocomplete ComboBox in Python-Tkinter

Last Updated : 20 Dec, 2022
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Prerequisites: Python GUI – tkinter The 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('<KeyRelease>', checkkey) #creating list box lb = Listbox(root) lb.pack() update(l)   root.mainloop() 
Output: python-listbox

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