Decorator_cache.py

import time 

def cache(func):
    cache_value = {}
    print(cache_value)
    def wrapper(*args, **kwargs):
        if args in cache_value:
            return cache_value[args]
        result = func(*args, **kwargs)
        cache_value[args] = result
        return result
    return wrapper

@cache
def long_running(a, b):
    time.sleep(4)
    return a+b

print(long_running(2,3))
print(long_running(2,3))
print(long_running(2,7))
print(long_running(2,6))