Creating GUIs in Python using Tkinter: Build a Login App in 30 Minutes

In this tutorial, we will learn how to build a Login App GUI using Python’s Tkinter library. Tkinter is the standard GUI toolkit that comes with Python and is easy to use for creating interactive graphical user interfaces.

We will create a simple login form with username and password fields, along with a submit button to authenticate the user. Let’s get started!

Step 1: Install Tkinter

Tkinter is included with Python, so you don’t need to install anything extra. If you are using Python 2.x, you will need to install Tkinter separately with the following command:

pip install tk

Step 2: Import the necessary libraries

We will start by importing the Tkinter module along with the messagebox module for displaying messages to the user.

import tkinter as tk
from tkinter import messagebox

Step 3: Create the main window

Next, we will create the main window for our login app using the Tk class. We will set the title, size, and background color of the window.

root = tk.Tk()
root.title("Login App")
root.geometry("300x200")
root.configure(bg="lightblue")

Step 4: Create username and password fields

Now, let’s create the username and password input fields using the Entry class. We will also add labels to identify each field.

username_label = tk.Label(root, text="Username", bg="lightblue")
username_label.pack()
username_entry = tk.Entry(root)
username_entry.pack()

password_label = tk.Label(root, text="Password", bg="lightblue")
password_label.pack()
password_entry = tk.Entry(root, show='*')
password_entry.pack()

Step 5: Create the submit button

We will create a submit button that will call a function to validate the username and password entered by the user.

def login():
    username = username_entry.get()
    password = password_entry.get()

    if username == "admin" and password == "admin123":
        messagebox.showinfo("Login Successful", "Welcome, Admin!")
    else:
        messagebox.showerror("Login Failed", "Invalid username or password")

submit_btn = tk.Button(root, text="Submit", command=login)
submit_btn.pack()

Step 6: Run the main loop

Finally, we will run the main loop to display the login app window and wait for user input.

root.mainloop()

And that’s it! You have successfully created a Login App GUI using Python’s Tkinter library in just 30 minutes. Feel free to customize the design and functionality according to your requirements.

I hope you found this tutorial helpful. Happy coding!