本文介绍了只能通过继承在进程之间共享获取队列对象,但我没有使用队列的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我正在尝试使用ProcessPoolExecutor,但收到错误"队列对象应仅通过继承在进程之间共享",但我没有使用队列(至少没有显式使用)。我找不到任何东西来解释我做错了什么。

以下是演示该问题的一些代码(不是我的实际代码):

from concurrent.futures import ProcessPoolExecutor, as_completed

class WhyDoesntThisWork:

    def __init__(self):
        self.executor = ProcessPoolExecutor(4)

    def execute_something(self, starting_letter):
        futures = [self.executor.submit(self.something, starting_letter, d) for d in range(4)]
        letter = None
        for future in as_completed(futures):
            letter = future.result()
        print(letter)

    def something(self, letter, d):
        # do something pointless for the example
        for x in range(d):
            letter = chr(ord(letter) + 1)

if __name__ == '__main__':
    WhyDoesntThisWork(). execute_something('A')
El Ruso曾指出,将某事()设为静态方法或类方法可以消除错误。遗憾的是,我的实际代码需要使用self调用其他方法。

推荐答案

尝试something

的代码
@staticmethod
def something(letter, d):
    # do something pointless for the example
    for x in range(d):
        letter = chr(ord(letter) + 1)

或重构为:

from concurrent.futures import ProcessPoolExecutor, as_completed


class WhyDoesntThisWork:
    def something(self, letter, d):
        # do something pointless for the example
        for x in range(d):
            letter = chr(ord(letter) + 1)
        return letter


if __name__ == '__main__':
    executor = ProcessPoolExecutor(4)
    letter = 'A'
    obj = WhyDoesntThisWork()
    futures = [executor.submit(obj.something, letter, d) for d in range(4)]
    for future in as_completed(futures):
        print(future.result())

这篇关于只能通过继承在进程之间共享获取队列对象,但我没有使用队列的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

10-29 23:27