Create a Python login form with Tkinter's grid manager

Last update on April 25 2025 12:53:36 (UTC/GMT +8 hours)

Write a Python program that designs a simple login form with labels and Entry widgets, arranging them in a grid using the Grid geometry manager.

Sample Solution:

Python Code:

import tkinter as tk

# Create a function to handle the login button click event
def login():
    username = username_entry.get()
    password = password_entry.get()

    if username == "user1" and password == "abcd123":
        login_status.config(text="Login successful", fg="green")
    else:
        login_status.config(text="Login failed. Try again.", fg="red")

# Create the main Tkinter window
parent = tk.Tk()
parent.title("Login Form")

# Create labels and Entry widgets for username and password
username_label = tk.Label(parent, text="Username:")
password_label = tk.Label(parent, text="Password:")
username_entry = tk.Entry(parent)
password_entry = tk.Entry(parent, show="*")  # Show '*' for password entry

# Create a Login button
login_button = tk.Button(parent, text="Login", command=login)

# Create a label to display login status
login_status = tk.Label(parent, text="", fg="black")

# Use the Grid geometry manager to arrange widgets
username_label.grid(row=0, column=0, padx=10, pady=5, sticky="E")
username_entry.grid(row=0, column=1, padx=10, pady=5)
password_label.grid(row=1, column=0, padx=10, pady=5, sticky="E")
password_entry.grid(row=1, column=1, padx=10, pady=5)
login_button.grid(row=2, column=0, columnspan=2, padx=10, pady=10)
login_status.grid(row=3, column=0, columnspan=2, padx=10, pady=5)
# Run the Tkinter main loop
parent.mainloop()

Explanation:

In the exercise above -

Import the tkinter module as 'tk'.
Create the main Tkinter window using tk.Tk() and set its title to "Login Form."
Labels (username_label and password_label) and entry widgets (username_entry and password_entry) should be created for username and password input. The show="*" option hides the actual characters in the password entry.
Create a Login button (login_button) and a label (login_status) to display the login status.
For grid layouts, we use the "grid()" method. Each widget has a row and column position specified. "columnspan" is used to make login_button and login_status span across two columns.
Define a login() function to handle the login button click event. For demonstration purposes, it compares the entered username and password with "user1" and "abcd123". The login status is updated accordingly.
Finally the Tkinter main loop is started by root.mainloop(), which displays the login form in a grid layout and keeps the GUI application running.

Sample Output:

Flowchart:

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