David's Blog

How to Create a Password Generator in Python

By David Li on Fri, 15 April 2023

Creating a password generator is a useful programming exercise that can teach you about random number generation, string manipulation, and graphical user interface (GUI) design. In this article, we’ll go through the steps to create a password generator in Python and then show you how to create a simple GUI using the tkinter library.

Step 1: Generating a Random Password

The first step in creating a password generator is to write a function that can generate a random password. Here is an example function that generates a password of a specified length:

import random
import string

def generate_password(length):
    chars = string.ascii_letters + string.digits + string.punctuation
    password = ''.join(random.choice(chars) for i in range(length))
    return password

This function first creates a string called chars that contains all the characters that can be used in a password. It then generates a password by selecting length random characters from this string using the random.choice function. Finally, it returns the password as a string.

Step 2: Creating a GUI

Now that we have a function to generate passwords, we can create a GUI that allows users to specify the length of the password and generate a new password with the click of a button. To do this, we’ll use the tkinter library, which is included with Python.

Here’s an example GUI that includes a label, a text entry widget, a button, and another label to display the generated password:

import tkinter as tk

def generate_password():
    length = int(length_entry.get())
    password = generate_password(length)

# Create the main window
window = tk.Tk()
window.title("Password Generator")

# Create the label for the password length
length_label = tk.Label(window, text="Password length:")

# Create the text entry widget for the password length
length_entry = tk.Entry(window)

# Create the button to generate a new password
generate_button = tk.Button(window, text="Generate", command=generate_password)

# Create the label to display the generated password
password_label = tk.Label(window, text="")

# Start the main event loop

In this code, we first define the generate_password function as before. We then create a main window using the Tk class from tkinter and set its title to “Password Generator”.

Next, we create a label and a text entry widget to allow the user to specify the length of the password. We also create a button that calls the generate_password function when clicked.

Finally, we create another label that displays the generated password, and we start the main event loop using the mainloop method of the window object.


In this article, we’ve shown you how to create a password generator in Python and how to create a simple GUI using the tkinter library. You can use this code as a starting point to create more complex password generators or to add more features to the GUI. Happy coding!

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