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POsubprocess.Popen and shlex.split formatting in windows and linux
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  1. POsubprocess.Popen and shlex.split formatting in windows and linux
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    copied!<p>I am writing a wrapper to automate some android ADB shell commands via Python (2.7.2). Since, in some cases, I need to run the command asynchronously, I am using the <a href="http://docs.python.org/library/subprocess.html" rel="nofollow">subprocess</a>.Popen method to issue shell commands.</p> <p>I have run into a problem with the formatting of the <code>[command, args]</code> parameter of the <code>Popen</code> method, where there require command/args split is different between Windows and Linux:</p> <pre><code># sample command with parameters cmd = 'adb -s &lt;serialnumber&gt; shell ls /system' # Windows: s = subprocess.Popen(cmd.split(), shell=False) # command is split into args by spaces # Linux: s = subprocess.Popen([cmd], shell=False) # command is a list of length 1 containing whole command as single string </code></pre> <p>I have tried using <a href="http://docs.python.org/library/shlex.html" rel="nofollow">shlex</a>.split(), with and with out the posix flag:</p> <pre><code># Windows posix = False print shlex.split(cmd, posix = posix), posix # Linux posix = True print shlex.split(cmd, posix = posix), posix </code></pre> <p>Both cases return the same split.</p> <p>Is there a method in <code>subprocess</code> or <code>shlex</code> that handles the OS-specific formats <em>correctly</em>?</p> <p><strong>This is my current solution:</strong></p> <pre><code>import os import tempfile import subprocess import shlex # determine OS type posix = False if os.name == 'posix': posix = True cmd = 'adb -s &lt;serialnumber&gt; shell ls /system' if posix: # posix case, single command string including arguments args = [cmd] else: # windows case, split arguments by spaces args = shlex.split(cmd) # capture output to a temp file o = tempfile.TemporaryFile() s = subprocess.Popen(args, shell=False, stdout=o, stderr=o) s.communicate() o.seek(0) o.read() o.close() </code></pre> <p>I don't think <code>shlex.split()</code> is doing anything here, and <code>cmd.split()</code> achieves identical results.</p>
 

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