装饰者模式函数装饰器

def solve():
    import time
    def timer(____):
        def wrapper(____):
            start = time.time()
            result = func(____)
            elapsed = time.time() - start
            print(____)
            return result
        return wrapper
    @timer
    def add(____):
        return a + b
    print(add(____, ____))