What is a Python decorator?
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A Python decorator is a powerful feature that allows you to modify or extend the behavior of a function or method without changing its actual code. Decorators are often used for logging, authentication, timing, caching, and more.
How it works:
A decorator is a function that takes another function as input and returns a new function with added functionality.
Here, @decorator_function is applied to say_hello, which gets passed to the decorator. The original function’s behavior is extended without modifying its code directly.
Key Points:
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@decorator_name is syntactic sugar for
function = decorator_name(function). -
Decorators are often used in web frameworks (e.g., Flask, Django) and for DRY (Don't Repeat Yourself) principles.
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You can use
functools.wrapsto preserve metadata of the original function (like its name and docstring).
Conclusion:
Decorators add extra functionality to functions or methods in a clean, readable, and reusable way — making Python code more modular and expressive.
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