How to get the name of a button tkinter python

Question

I am fairly new to working with tkinter in python and ran into trouble getting the name of some buttons created from a loop. In theory, pressing a button should print the name of the button pressed.

This is my code:

import tkinter as tk

def f ():
    print ("Frame:", frm.winfo_children())

root = tk.Tk()
frm = tk.Frame(root)

for i in range (0,3):
  bt = tk.Button(frm,text = str(i),name = str(i),command = f).pack()
frm.pack()

root.mainloop()

Programmer · Accepted Answer · 2021-01-21T14:51:27.503

0

You can pass the number to the callback function with lambda:

import tkinter as tk

def f(name):
    print ("Frame:", frm.winfo_children())
    print(name)

root = tk.Tk()
frm = tk.Frame(root)

for i in range (0, 3):
    bt = tk.Button(frm, text = str(i), name = str(i), command = lambda i=i: f(str(i)))
    bt.pack()

frm.pack()

root.mainloop()

edited Jan 21 '21 at 14:51

answered Jan 21 '21 at 14:26

Programmer

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Yes, but with this the f function only returns the last value of i it has, since the buttons will be used once the for loop has finished. I am waiting that when I press a button I print the name of it – Dante_Annetta Jan 21 '21 at 14:49
@Dante_Annetta @frederic You need to write `lambda i=i: f(str(i))` as described [here](https://stackoverflow.com/a/49617454/6486738). – Ted Klein Bergman Jan 21 '21 at 14:51
@Dante_Annetta i tested my code and it works now. – Programmer Jan 21 '21 at 14:54
@Dante_Annetta please accept my answer by clicking the grey checkmark on the left of it – Programmer Jan 21 '21 at 15:01

score -3 · Answer 2 · edited Jan 26 '21 at 13:33

-3

This should work

import tkinter as tk

def f (): 
    print ("Frame:", frm.winfo_children())

root = tk.Tk() 
frm = tk.Frame(root)

for i in range (0, 3): 
    bt = tk.Button(self, frm, text = str(i), name = str(i), command = f)
    bt.pack() 
frm.pack()

root.mainloop()

edited Jan 26 '21 at 13:33

Programmer

5,276
3
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answered Jan 21 '21 at 14:48

Washington Azevedo

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How does this answer the question? Also, you're unnecessarily packing the frame 3 times. – Ted Klein Bergman Jan 21 '21 at 14:52
@TedKleinBergman how is he packing it 3 times ? – Programmer Jan 21 '21 at 19:22
@frederic In the for-loop there's a `frm.pack()` that's called 3 times. – Ted Klein Bergman Jan 21 '21 at 19:31

How to get the name of a button tkinter python

2 Answers2