python闭包应用之装饰器-缓存计算

def decorator(func):
    dic = {}
    print(dic, '....')
    
    def wrapper(*args):
        if args in dic:
            print(f'no calculator, dic ={dic}')
            return dic[args]
        
        value = func(*args)
        dic[args] = value
        print(f'calculator, dic = {dic}')
        return func(*args)
    
    return wrapper


@decorator
def add(a, b, c):
    return a + b + c


print(add(1, 2, 3))
print(add(1, 2, 3))
print(add(4, 5, 6))
print(add(4, 5, 6))

{} ....
calculator, dic = {(1, 2, 3): 6}
6
no calculator, dic ={(1, 2, 3): 6}
6
calculator, dic = {(1, 2, 3): 6, (4, 5, 6): 15}
15
no calculator, dic ={(1, 2, 3): 6, (4, 5, 6): 15}
15