Tkinter - editing a text box using a button

Question

Using Tkinter in Python I am trying to change what is displayed in a textbox when a button is pressed. My code so far is:

screen = Tk()
text = Text(screen, height = 2, width = 30)
text.pack()
text.insert(END, '-')

def apress():
    text.insert(END, 'a')

a = Tkinter.Button (screen, text = 'a', width = 5, command = apress).pack()

mainloop()

When the code is run nothing happens and the debugger will not stop running even if you click 'abort debugging'. Is there a way to fix this?

Answer 1

Here's the working code:

from Tkinter import *

screen = Tk()
text = Text(screen, height = 2, width = 30)
text.pack()
text.insert(END, '-')

def apress():
    text.insert(END, 'a')

btn = Button(screen, text = 'a', width = 5, command = apress) 
btn.pack()

mainloop()

Changes I made:

• Added the import from Tkinter import *
• Used Button instead of Tkinter.Button - since we used an wildcard import
• Button.pack() separated on a new line

Demo:

Initial view:

Clicked the button several times: