Button image doesn't appear, Tkinter

Question

I'm currently having a problem while trying to assign images to buttons in a for loop:

for index in range(16): b = tk.Button(button_frame, text = letter,image = tk.PhotoImage(file = letter+".png"), command= self.letter_typed(letter, word_label)) b.image = tk.PhotoImage(file = letter+".png") b.grid(row = index//4, column = index%4)

where letter is a letter (string) of the alphabet. I have 26 png each one for a letter of the alphabet, in this function I create only 16 buttons with letters pictures. Problem is that the picture doesn't appear, only a blank case that has the same size as the picture wanted. I know this has something to do with python garbage collector. Another thing, I can obtain the result wanted but I need to create manually each PhotoImage instance, and I would like to avoid that if possible, also I should mention that I'm doing all of this in a class. Thank you for your help!

Try this approach: way-of-avoiding-unwanted-garbage-collection — stovfl
– stovfl, Commented Jan 20, 2020 at 17:43

acw1668 · Accepted Answer · 2020-01-20 17:51:48Z

You did not save the reference of tk.PhotoImage used in b = tk.Button(...). Also you assigned the result of self.letter_typed(...) to command argument of tk.Button.

Fixed code:

for index in range(16): tkimg = tk.PhotoImage(file=letter+'.png') b = tk.Button(button_frame, text=letter, image=tkimg, command=lambda: self.letter_typed(letter, word_label)) b.image = tkimg b.grid(row=index//4, column=index%4)

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