Python Tkinter Button Click Function

In this example we will show how to handle a Button click event in tkinter.

The Button widget is useful for handling such events in Python Tkinter. We can use Button widget to perform a certain task or event by passing the callback in the command.

Examples

Example 1: In this example, we will create a button and pass the function to show a popup message on the window.


from tkinter import *
from tkinter import messagebox

root = Tk()
root.title("App")
root.geometry("200x100")

def message():
  messagebox.showinfo("Message :) ", "Hello, World!")


button = Button(
  text="Click!",
  command=message
)
button.pack()

root.mainloop()

from tkinter import *

from tkinter import messagebox

root = Tk()

root.title("App")

root.geometry("200x100")

def message():

messagebox.showinfo("Message :) ", "Hello, World!")

button = Button(

text="Click!",

command=message

)

button.pack()

root.mainloop()

Output:

Example 2: In this example, we will create a button, a label and pass the function to write a text in the label.


from tkinter import *

root = Tk()
root.title("App")
root.geometry("200x100")

def message():
   label.config(
     text = "Hello World!"
   )


button = Button(
  text="Click!",
  command=message
)
button.pack()

label = Label(
  text="..."
)
label.pack()

root.mainloop()