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    <blockquote> <p>but I can't get the result (stdout) of my command...</p> </blockquote> <p><a href="https://github.com/kennethreitz/envoy/blob/a02ad4c7e1021e4443e3e4edc87715182c23f85f/envoy/core.py#L100" rel="nofollow"><code>ConnectedCommand</code></a> (the type returned by <code>envoy.connect()</code>) doesn't seem to be ready. In particular, the command can deadlock if it receives/generates enough (depending on platform) input/output. </p> <p>In addition to calling <code>c.block()</code> that also works for alive processes; you could remove all references to the command and use <code>del c</code> to reap the zombie. If subprocesses are not dead; they won't be reaped until a cleanup method is run on start of the next subprocess (it depends on the implementation).</p> <p>If <code>envoy.run()</code> capabilities are not enough for your task; you could use <code>subprocess</code> module directly. For example, to pass input to several processes and collect corresponding results; you could use <code>ThreadPool</code> and <code>.communicate()</code> method:</p> <pre><code>#!/usr/bin/env python from multiprocessing.pool import ThreadPool from subprocess import Popen, PIPE def process(child_input): child, input = child_input # unpack arguments return child.communicate(input)[0], child.returncode # get the result # define input to be pass to subprocesses params = b"a b c".split() # start subprocesses (the command is just an example, use yours instead) children = [Popen("( echo -n {0}; sleep {0}; cat )".format(len(params) - i), shell=True, stdin=PIPE, stdout=PIPE) for i in range(len(params))] # use threads to wait for results in parallel pool = ThreadPool(len(params)) for output, returncode in pool.imap_unordered(process, zip(children, params)): if returncode == 0: print("Got %r" % output) </code></pre> <p>The less child sleeps the sooner its result is available to the parent regardless of the original order.</p> <p>No zombies and It won't deadlock if input/output exceed pipe buffers.</p>
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