Question

我正在尝试执行我不关心何时以及如何完成的任务。它是Python3.5，并且没有安装或想要的其他异步软件包，只是“asyncio”。

有一个很好的包“计划”可以很好地安排：

import schedule

schedule.every(5).seconds.do(call_my_remote_url)

while 1:
    schedule.run_pending()
    time.sleep(1)

有一个火灾和遗忘代码可以完成它的工作：

def fire_and_forget(task, *args, **kwargs):
    loop = asyncio.get_event_loop()
    if callable(task):
        return loop.run_in_executor(None, task, *args, **kwargs)
    else:
        raise TypeError('Task must be a callable')

然而，当我把它放在一起时：

import schedule
import time
import datetime
import asyncio


def call_my_remote_url():
    # Do stuff, completion of which I don't care. For example
    print("started @ "+str(datetime.datetime.now().time()))
    time.sleep(5)
    print("completed @ " + str(datetime.datetime.now().time()))


def fire_and_forget(task, *args, **kwargs):
    loop = asyncio.get_event_loop()
    if callable(task):
        return loop.run_in_executor(None, task, *args, **kwargs)
    else:
        raise TypeError('Task must be a callable')


schedule.every(5).seconds.do(fire_and_forget(call_my_remote_url))

while 1:
    schedule.run_pending()
    time.sleep(1)

它悲惨地失败了：

(env) $ python3 example_fire_and_forget_with_scheduler.py 
started @ 12:19:04.901547
Traceback (most recent call last):
  File "example_fire_and_forget_with_scheduler.py", line 21, in <module>
    schedule.every(5).seconds.do(fire_and_forget(call_my_remote_url))
  File "/Users/user/Projects/env/lib/python3.5/site-packages/schedule/__init__.py", line 352, in do
    self.job_func = functools.partial(job_func, *args, **kwargs)
TypeError: the first argument must be callable
completed @ 12:19:09.906020
(env)$

似乎“shedule”模块不开心，btu我不明白为什么以及如何解决它。任何想法或简单替代品？ （请注意，它不仅仅是异步，而且必须按计划忘记火灾）

Answer 1

你以不喜欢的方式将参数传递给do。稍微简化问题，以下似乎有效：

import schedule
import time
import datetime


def call_my_remote_url():
    # Do stuff, completion of which I don't care. For example
    print("started @ "+str(datetime.datetime.now().time()))
    time.sleep(5)
    print("completed @ " + str(datetime.datetime.now().time()))


def fire_and_forget(task, *args, **kwargs):
    if callable(task):
        return task()
    else:
        raise TypeError('Task must be a callable')


schedule.every(5).seconds.do(fire_and_forget, call_my_remote_url)

while 1:
    schedule.run_pending()
    time.sleep(1)

因此fire_and_forget的参数会传递给do。我似乎无法在文档中找到详细信息，但this example暗示了这一点。

计划中的火灾和遗忘

1 个答案: