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OOP & classes

Classes, instances, methods, dataclasses, and object-oriented design in Python.

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OOP & classes easy

How to Implement the Decorator Pattern in Python to Add Behavior

This Python code demonstrates the decorator pattern by wrapping a function to add logging behavior without modifying the original function.

decorator pattern logging
Python 
import functools

def logger(func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        print(f"Calling {func.__name__} with {args} {kwargs}")
        result = func(*args, **kwargs)
        print(f"{func.__name__} returned {result}")
        return result
    return wrapper

@logger
def add(a, b):
   …
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