Q10: Python Decorators and `functools.wraps`: - Python & FastAPI

In Simple Words: A decorator is a function that takes another function, wraps its behavior, and returns a new function. functools.wraps is essential to preserve the original function's name (__name__) and docstring.

python

import functools, time

def timer(func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        start = time.perf_counter()
        result = func(*args, **kwargs)
        duration = time.perf_counter() - start
        print(f"{func.__name__} took {duration:.4f}s")
        return result
    return wrapper

@timer
def compute():
    return sum(range(1_000_000))