Call a Function with a Button or a Key in Tkinter

Let assume that we want to call a function whenever a button or a key is pressed for a particular application. We can bind the function that contains the operation with a button or key using the bind('<button or Key>,' callback_function) method. Here, you can bind any key to the event or function that needs to be called.

Example

In this example, we have created a function that will open a dialog box whenever we click a button.

#Import the required libraries
from tkinter import *
from tkinter import ttk
from tkinter import messagebox

#Create an instance of Tkinter Frame
win = Tk()

#Set the geometry of Tkinter Frame
win.geometry("700x350")

#Define a function for opening the Dialog box
def open_prompt():
   messagebox.showinfo("Message", "Click Okay to Proceed")

#Create a Label widget
Label(win, text= "Click to Open the MessageBox").pack(pady=15)

#Create a Button for opening a dialog Box
ttk.Button(win, text= "Open", command= open_prompt).pack()

win.mainloop()

Output

Running the above code will display a window containing a label and a button.

Upon clicking the "Open" button", it will call a function to open a dialog box.