Beginner’s Guide to Flask Web Development with Python: Edureka’s Python Flask Tutorial

In this tutorial, we will cover Python Flask, a popular web development framework in Python. We will learn how to create a simple web application using Flask and explore some of its key features.

Python Flask Tutorial For Beginners

What is Flask?
Flask is a micro web framework written in Python. It is lightweight and easy to use, making it perfect for beginners to start building web applications. Flask is widely used for developing web applications, REST APIs and more.

Prerequisites
Before diving into this tutorial, you need to have the following prerequisites:

• Basic knowledge of Python programming language
• Python installed on your machine
• Flask installed on your machine

If you haven’t installed Flask yet, you can do so by running the following command:

pip install Flask

Creating a Simple Web Application
To begin, let’s create a simple web application using Flask. Follow the steps below to create a basic Flask application:

Step 1: Create a new file named app.py and open it in your favorite code editor.
Step 2: Import the Flask module and create a new Flask application instance.

from flask import Flask

app = Flask(__name__)

Step 3: Create a route for the home page of your web application.

@app.route('/')
def home():
    return 'Hello, World!'

Step 4: Run the Flask application.

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

To run the application, execute the app.py file in your terminal by running:

python app.py

Now, if you open a web browser and navigate to http://127.0.0.1:5000/, you should see Hello, World! displayed on the page.

Adding Dynamic Content
Flask allows you to pass dynamic content to your web pages using route parameters. Let’s modify our app.py file to pass a name parameter to the home route:

@app.route('/<name>')
def home(name):
    return f'Hello, {name}!'

Now, if you navigate to http://127.0.0.1:5000/yourname, you should see Hello, yourname! displayed on the page.

Key Features of Flask
Flask offers a variety of features that make web development easier and more enjoyable. Some of the key features of Flask include:

• Routing: Flask uses decorators to define routes in your application, making it easy to map URLs to specific functions.
• Templating: Flask supports Jinja templates, which allow you to create dynamic HTML content using variables and control structures.
• HTTP Methods: Flask supports different HTTP methods such as GET, POST, PUT, DELETE, etc., making it easy to handle different types of requests.
• Flask Extensions: Flask has a large ecosystem of extensions that add additional functionality to your web application, such as authentication, caching, and more.

Conclusion
In this tutorial, we covered the basics of Python Flask and learned how to create a simple web application using Flask. We explored some of the key features of Flask and how they can be used to build dynamic and interactive web applications.

I hope this tutorial was helpful in getting you started with Flask web development. Happy coding!