子进程中的 Python 用户输入 [英] Python user input in child process

问题描述

我正在尝试创建一个可以通过 raw_input() 或 input() 获取输入的子进程，但是在要求输入时，我遇到了线性错误 EOFError: EOF 的结束.

I'm trying to create a child process that can take input through raw_input() or input(), but I'm getting an end of liner error EOFError: EOF when asking for input.

我这样做是为了在 python 中试验多处理，我记得这很容易在 C 中工作.是否有一种解决方法，而不使用从主进程到子进程的管道或队列?我真的很想让孩子处理用户输入.

I'm doing this to experiment with multiprocessing in python, and I remember this easily working in C. Is there a workaround without using pipes or queues from the main process to it's child ? I'd really like the child to deal with user input.

def child():
    print 'test' 
    message = raw_input() #this is where this process fails
    print message

def main():
    p =  Process(target = child)
    p.start()
    p.join()

if __name__ == '__main__':
    main()

我编写了一些测试代码，希望能显示我想要实现的目标.

I wrote some test code that hopefully shows what I'm trying to achieve.

推荐答案

我的答案取自这里:有没有办法将'stdin'作为参数传递给python中的另一个进程?

我已经修改了你的例子，它似乎工作:

I have modified your example and it seems to work:

from multiprocessing.process import Process
import sys
import os

def child(newstdin):
    sys.stdin = newstdin
    print 'test' 
    message = raw_input() #this is where this process doesn't fail anymore
    print message

def main():
    newstdin = os.fdopen(os.dup(sys.stdin.fileno()))
    p =  Process(target = child, args=(newstdin,))
    p.start()
    p.join()

if __name__ == '__main__':
    main()

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