Decorators

A decorator wraps a function to add behaviour — like timing, logging or caching — without changing its code.

Intermediate

import functools, time

def timed(func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        start = time.perf_counter()
        result = func(*args, **kwargs)
        print(f"{func.__name__} took {time.perf_counter() - start:.3f}s")
        return result
    return wrapper

@timed
def read_all_sensors():
    ...

@timed is shorthand for read_all_sensors = timed(read_all_sensors). Built-in examples: @staticmethod, @property, @functools.lru_cache.

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