如何在Python的父进程和派生子进程之间共享数据? [英] How do you share data between a parent and forked child process in Python?

问题描述

我很确定有人会使用os.plock(op)函数来做到这一点，但是我不知道如何做到这一点.另外，如果有更好的方法，我将不胜感激.代码段非常受欢迎.

I'm pretty sure one would do this using the os.plock(op) function, but I have no idea how. Also, if there's a better way, I'd be grateful to find out. Code snippets are very welcome.

推荐答案

Subprocess 替换了os. popen，os.system，os.spawn，popen2和命令. 用于管道的简单示例为:

Subprocess replaces os.popen, os.system, os.spawn, popen2 and commands. A simple example for piping would be:

p1 = Popen(["dmesg"], stdout=PIPE)
p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
output = p2.communicate()[0]

您还可以使用带有标志= MAP_SHARED的内存映射文件进程之间.

You could also use a memory mapped file with the flag=MAP_SHARED for shared memory between processes.

多重处理都将

multiprocessing abstracts both pipes and shared memory and provides a higher level interface. Taken from the Processing documentation:

from multiprocessing import Process, Pipe

def f(conn):
    conn.send([42, None, 'hello'])
    conn.close()

if __name__ == '__main__':
    parent_conn, child_conn = Pipe()
    p = Process(target=f, args=(child_conn,))
    p.start()
    print parent_conn.recv()   # prints "[42, None, 'hello']"
    p.join()

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