如何在 python 多处理池 apply_async 中使用关键字参数

2022-01-12 00:00:00 python multiprocessing threadpool

问题描述

我正在尝试掌握 python 的多处理模块，特别是 Pool 的 apply_async 方法.我正在尝试使用参数和关键字参数调用函数.如果我在没有 kwargs 的情况下调用该函数，那很好，但是当我尝试添加关键字参数时，我得到:TypeError: apply_async() got an unexpected keyword argument 'arg2'下面是我正在运行的测试代码

I'm trying to get to grips with pythons multiprocessing module, specifically the apply_async method of Pool. I'm trying to call a function with arguments and keyword arguments. If I call the function without kwargs it's fine but when I try to add in a keyword argument I get: TypeError: apply_async() got an unexpected keyword argument 'arg2' Below is the test code that I'm running

#!/usr/bin/env python
import multiprocessing
from time import sleep
def test(arg1, arg2=1, arg3=2):
    sleep(5)

if __name__ == '__main__':
    pool = multiprocessing.Pool()
    for t in range(1000):
        pool.apply_async(test, t, arg2=5)
    pool.close()
    pool.join()

如何调用函数以使其接受关键​​字参数?

How can I call the function so that it accepts keyword arguments?

解决方案

在字典中传递关键字 args(以及在元组中的位置参数):

Pass the keyword args in a dictionary (and the positional arguments in a tuple):

pool.apply_async(test, (t,), dict(arg2=5))

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