In Tkinter, events are generally called by buttons or keys. Whenever the user presses an assigned key or clicks an assigned button, the events get executed. To execute the events, we can bind a button or a key with the callback function.
Consider an application where we need to trigger an event whenever we release the mouse button. This can be achieved by passing the <Button Release> parameter in the bind(<ButtonRelease>, callback) method.
Example
# Import the required libraries
from tkinter import *
# Create an instance of tkinter frame or window
win=Tk()
# Set the size of the window
win.geometry("700x350")
# Define a function on mouse button clicked
def on_click(event):
label["text"]="Hello, There!"
def on_release(event):
label["text"]="Button Released!"
# Crate a Label widget
label=Label(win, text="Click anywhere..", font=('Calibri 18 bold'))
label.pack(pady=60)
win.bind("<ButtonPress-1>", on_click)
win.bind("<ButtonRelease-1>", on_release)
win.mainloop()Output
If we run the above code, it will display a window with a label widget.
Now, click anywhere in the window to see the message on the screen that will get updated when we release the mouse button.
When you release the mouse button, it will display the following message −
