What are Python decorators, and how are they used in a web application context?

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iHub – The Best Full Stack Python Training Course Institute in Hyderabad with Live Internship & Industry Expert

When it comes to mastering Python and becoming a job-ready Full Stack developer, iHub stands out as the best Full Stack Python training institute in Hyderabad. iHub offers an intensive, hands-on learning program that includes classroom training, project-based learning, and a live internship program led by industry experts

Designed for graduates, postgraduates, and individuals with an education gap or career transition background, the course covers both frontend and backend development using Python, Django, HTML, CSS, JavaScript, React, and modern databases like MySQL and MongoDB.

Why iHub Is the Top Choice for Python Full Stack Training in Hyderabad

Live intensive internship with real-time project exposure

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Focus on both technical skills and soft skills

Personalized attention for career changers and non-IT background students

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What Are Python Decorators and How Are They Used in Web Applications?

In Python, decorators are a powerful feature that allows you to modify or extend the behavior of functions or methods without changing their code. Decorators use the concept of higher-order functions — functions that take other functions as arguments.

Syntax of a Basic Decorator

python

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def my_decorator(func):

    def wrapper():

        print("Before the function is called")

        func()

        print("After the function is called")

    return wrapper

@my_decorator

def say_hello():

    print("Hello!")

say_hello()

In the above example, @my_decorator wraps the say_hello function, adding additional behavior before and after its execution.

Decorators in Web Applications

In web frameworks like Flask or Django, decorators are commonly used to handle:

Authentication and Authorization

Logging and Debugging

Input Validation

Rate Limiting

Caching and Performance Tuning

Example in Flask

python

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from flask import Flask, request, redirect, url_for

app = Flask(__name__)

def login_required(func):

    def wrapper(*args, **kwargs):

        if not user_authenticated():

            return redirect(url_for('login'))

        return func(*args, **kwargs)

    return wrapper

@app.route('/dashboard')

@login_required

def dashboard():

    return "Welcome to your dashboard"

In this case, @login_required ensures that only authenticated users can access the /dashboard route. This is a clean and reusable way to enforce logic across multiple endpoint

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