Python 调度函数执行的装饰器

Question

我需要编写一个 Python 带有参数的装饰器来安排函数的执行。

我尝试编写一个 returns 装饰器的函数，但没有成功：

import time


def scheduled(duration):
    def decorator(function):
        time.sleep(duration)
        def new_function(*args, **kwargs):
            return function(*args, **kwargs)
        return new_function
    return decorator


@scheduled(1)
def hello():
    print('Hello, world!')


start = time.time()
hello()
print(f'Execution took {round(time.time() - start, 2)}s')

输出

Hello, world!
Execution took 0.0s

我希望函数在1秒后执行，如何实现？

Answer 1

行time.sleep(duration)应该在内部函数里面，像这样：

def scheduled(duration):
    def decorator(function):
        def new_function(*args, **kwargs):
            time.sleep(duration)
            return function(*args, **kwargs)
        return new_function
    return decorator

现在应该可以了

Python 调度函数执行的装饰器

Python decorator to schedule the execution of a function

python

python-decorators