Example of cached decorator in Python

cached_decorator_example.py

import time
cached_items = {}

def cached(func):
    def wrapper(*args, **kwargs):
        global cached_item
        if func.__name__ not in cached_items:
            cached_items[func.__name__] = func(*args, **kwargs)
        return cached_items[func.__name__]
    return wrapper

@cached
def intensive_task():
    time.sleep(1.0)
    return 10

start_time = time.time()
intensive_task()
print("--- %.8f seconds first execution ---" % (time.time() - start_time))
start_time = time.time()
intensive_task()
print("--- %.8f seconds second execution ---" % (time.time() - start_time))