Python for Beginners: How to Build a GUI Application

in this lesson we want to learn How to Build a GUI Application with Python – Python for Beginners, Creating a GUI (graphical user interface) application in Python can be a great way to get started with building desktop applications. Here is a step-by-step guide on how to create a basic GUI application using the Tkinter library, which is included in the Python standard library:

Start by importing the Tkinter module:

import tkinter as tk

1	import tkinter as tk

Next, create a new Tkinter application by instantiating the Tk() class:

root = tk.Tk()

1	root = tk.Tk()

Set the title of the application window by calling the title() method on the root object:

root.title("My First GUI App")

1	root.title("My First GUI App")

Create a label widget by instantiating the Label() class and passing in the parent widget (the root window) and the text to display:

label = tk.Label(root, text="Hello, World!")

1	label = tk.Label(root, text="Hello, World!")

Use the pack() method to add the label widget to the root window:

label.pack()

1	label.pack()

Create a button widget by instantiating the Button() class and passing in the parent widget (the root window), the text to display, and a function to call when the button is clicked:

def on_button_click():
    label.configure(text="Button was clicked!")

button = tk.Button(root, text="Click me!", command=on_button_click)

def on_button_click():

label.configure(text="Button was clicked!")

button = tk.Button(root, text="Click me!", command=on_button_click)

Use the pack() method to add the button widget to the root window:

button.pack()

1	button.pack()

Start the main event loop of the application by calling the mainloop() method on the root object:

root.mainloop()

1	root.mainloop()

Your complete code should look like this:

import tkinter as tk

root = tk.Tk()
root.title("My First GUI App")

label = tk.Label(root, text="Hello, World!")
label.pack()

def on_button_click():
    label.configure(text="Button was clicked!")

button = tk.Button(root, text="Click me!", command=on_button_click)
button.pack()

root.mainloop()