How to change Tkinter label text on button press

Question

I have this code, and its meant to change the text of the Instruction label when the item button is pressed. It doesn\'t for some reason, and I\'m not entirely

Answer 1

Doing:

message = 'Button Pressed'

will not affect the label widget. All it will do is reassign the global variable message to a new value.

To change the label text, you can use its .config() method (also named .configure()):

def press():
    Instruction.config(text='Button Pressed')

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In addition, you will need to call the pack method on a separate line when creating the label:

Instruction = tkinter.Label(Tk, text=message, font='size, 20')
Instruction.pack()

Otherwise, Instruction will be assigned to None because that is the method's return value.

Answer 2

You can make message a StringVar to make callback.

message = tkinter.StringVar()

message.set('Not pressed.')

You need to set message to be a textvariable for Instruction:

Instruction = tkinter.Label(Tk, textvariable=message, font='size, 20').pack()

and then

def press():
    message.set('Button Pressed')