Python Interview Questions and Answers | TechIdea

How do Decorators work in Python?

A decorator is a function that takes another function and extends its behavior without modifying it explicitly. It allows you to wrap a function with additional logic, like checking if a user is logged in before letting them access a route.

Deep Dive Explanation

Because Python functions are first-class citizens (they can be passed as arguments), a decorator takes a function as an argument, defines a wrapper function inside it that executes the additional code (before or after the original function), and then returns the wrapper. We use the `@decorator_name` syntax above a function as syntactic sugar for `func = decorator_name(func)`.

Enterprise Use Case: In Flask or FastAPI, you use `@app.route('/home')` to attach routing logic to a function. Or you might use `@login_required` to check authentication before a user can view a dashboard function.

💡 Interview Strategy:If asked to write one on a whiteboard, don't forget to use `functools.wraps` inside your decorator to preserve the original function's metadata (like its name and docstring).

🚨 Common Pitfalls to Avoid:

Forgetting to return the inner wrapper function at the end of the decorator.

Python Interview Questions

How do Decorators work in Python?

Deep Dive Explanation

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