Tkinter in Python 3 – simple example

Tkinter documentation for Python 3:

https://docs.python.org/3/library/tkinter.html

Simple example of making a button change some text:

from tkinter import *

def change_text():
    L1['text'] = 'This is the new text.'

root = Tk()

L1 = Label(root, text="This is a label.")
L1.pack()

b1 = Button(root, text="Click Here", command=change_text)
b1.pack()

root.mainloop()

Notes:

“command” is the function that’s called when button is clicked
L1[‘text’] changes the “text” attribute of the L1 label.
The pack() function adds an object to your application window. Without this, the object is created in memory, but it won’t be visible on your screen.
When using pack(), the objects are added in a vertical column in the order that you pack them.