How To Make A Login Page Using Python Flask

Python Programming

In this article, I will guide you through the process of creating a login page using Python Flask. As someone who has worked extensively with Flask, I can assure you that it is a powerful and efficient framework for building web applications. By the end of this tutorial, you will have a clear understanding of how to implement a login feature in your Flask application.

Setting Up the Flask Application

Before we dive into creating the login page, let’s start by setting up our Flask application. First, make sure you have Python installed on your system.

To install Flask, open your terminal or command prompt and run the following command:

pip install flask

Once Flask is installed, create a new directory for your project and navigate to it using the terminal:

mkdir login_app
cd login_app

Now, let’s create a virtual environment for our project to keep our dependencies isolated:

python -m venv venv

Activate the virtual environment:

source venv/bin/activate (for macOS/Linux)
venv\Scripts\activate (for Windows)

Next, let’s create a new file called “app.py” and open it in your favorite text editor:

touch app.py

Now, we are ready to start building our login page!

Creating the Login Page

In Flask, we use templates to render HTML pages. Create a new directory called “templates” inside your project directory:

mkdir templates

Inside the “templates” directory, create a new file called “login.html” and open it in your text editor:

touch templates/login.html

Now, let’s write the HTML code for our login page. Here’s a basic structure to get started:

"""



Login Page

Welcome to the Login Page!




"""

Feel free to add your own personal touches and customize the login page according to your preferences. You can add input fields for the username and password, as well as a submit button.

Handling login requests

Now that we have created the login page, let’s write the code to handle the login requests. Open the “app.py” file and import the necessary modules:

from flask import Flask, render_template, request

Create an instance of the Flask class:

app = Flask(__name__)

Next, define a route for the login page. This route will render the “login.html” template:

@app.route('/login', methods=['GET', 'POST'])
def login():
if request.method == 'POST':
# Process the login form data
username = request.form['username']
password = request.form['password']
# Implement your authentication logic here
# For simplicity, let's assume the username is "admin" and the password is "password"
if username == 'admin' and password == 'password':
return "Login Successful"
else:
return "Invalid Credentials"
return render_template('login.html')

Finally, add the code to run the Flask application:

if __name__ == '__main__':
app.run(debug=True)

Save the changes and run the application:

python app.py

Now, when you visit the URL “http://localhost:5000/login”, you should see your login page. You can enter the username and password you specified in the code and test the login functionality.

Conclusion

Creating a login page using Python Flask is a straightforward process that allows you to implement secure authentication in your web applications. By following the steps outlined in this article, you now have the knowledge to create your own login page using Flask. Feel free to explore additional features such as password hashing and user authentication to enhance the security of your login system.

I hope this tutorial has been helpful for you. Happy coding!