捕获它们的shell stdout存活的子进程stderr

以下是我想要做的事情:

-python process captures stderr of multiple subprocesses to watch the subprocesses
-each subprocess runs on the separate window displaying stdout. 

当我使用Popen(命令,stderr = fp4tempfile)时

(good) the python process can capture stderr of the subprocesses
(bad ) the subprocess shells stop displaying stdout.

当我使用Popen(命令)时

(good) each subprocess shells displays stdout (as well as stderr, which does not matter for me), 
(bad ) the python process cannot capture stderr. 

我想要“好”。 我能为此做些什么? 提前致谢。 (目前,我正在使用python3.2在windows7中开发)

以下是用python编写的父进程源代码:

import os,subprocess
import time
fpws = []
fprs = []

def run_command(command):
    <specifying a file to write -- skipped>
    fpw = open(ftempname,'w')
    fpr = open(ftempname,'r')
    #cmd_redirect = "%s 2>%s" % (command,ftempname)#didnt do anything
    #starting a sub-program:
    pp = subprocess.Popen(command,stderr = fpw) #++
    #pp = subprocess.Popen(command)             #@@
    fpws.append(fpw)
    fprs.append(fpr)    

def watch_program():
    while True: #running forever for simplfication
        for fpr in  fprs:
            outchunk = fpr.read()
            <do something for subprocesses stderr -- skipped>
            time.sleep(1.0)

if __name__ == '__main__':
    cmd1 = '(path to program1)'
    cmd2 = '(path to program2)'
    run_command(cmd1)  #kicking cmd1
    run_command(cmd2)  #kicking cmd2
    watch_program()          #hearing stderr msg from the other process

注意:在子进程端,根据需要调用fflush(stdout)和fflush(stderr)。


没有测试过这个,但你能做到吗?

import sys

pp = subprocess.Popen(command, stderr = fpw, stdout = sys.stdout)

I82Much,谢谢你的回答和评论。

是的,你对stderr的评论是绝对正确的。 我在windows7中开发。 在linux(ubuntu10)中,下面是简单的:

    cmd_line4sub = command + ' 2> ' + ftempname
    pp = subprocess.Popen(['/usr/bin/xterm','-e',cmd_line4sub],stderr = fpw)

它打开新的shell,打印子进程标准输出。 父进程捕获子进程stderr。 这是我的第一个目标。

如果我能想出如何在Windows中做,我会发布我的答案;)

(我和提问者是同一个用户,但我不能让他们成为同一个帐户......)

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