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    <p>There are two ways to do the redirect. Both apply to either <code>subprocess.Popen</code> or <code>subprocess.call</code>.</p> <ol> <li><p>Set the keyword argument <code>shell = True</code> or <code>executable = /path/to/the/shell</code> and specify the command just as you have it there.</p></li> <li><p>Since you're just redirecting the output to a file, set the keyword argument</p> <pre><code>stdout = an_open_writeable_file_object </code></pre> <p>where the object points to the <code>output</code> file.</p></li> </ol> <p><a href="http://docs.python.org/library/subprocess.html#subprocess.Popen" rel="noreferrer"><code>subprocess.Popen</code></a> is more general than <a href="http://docs.python.org/library/subprocess.html#subprocess.call" rel="noreferrer"><code>subprocess.call</code></a>.</p> <p><code>Popen</code> doesn't block, allowing you to interact with the process while it's running, or continue with other things in your Python program. The call to <code>Popen</code> returns a <code>Popen</code> object.</p> <p><code>call</code> <em>does</em> block. While it supports all the same arguments as the <code>Popen</code> constructor, so you can still set the process' output, environmental variables, etc., your script waits for the program to complete, and <code>call</code> returns a code representing the process' exit status. </p> <pre><code>returncode = call(*args, **kwargs) </code></pre> <p>is basically the same as calling </p> <pre><code>returncode = Popen(*args, **kwargs).wait() </code></pre> <p><code>call</code> is just a convenience function. It's implementation in CPython is in <a href="http://hg.python.org/cpython/file/e0df7db13d55/Lib/subprocess.py#l459" rel="noreferrer">subprocess.py</a>:</p> <pre><code>def call(*popenargs, timeout=None, **kwargs): """Run command with arguments. Wait for command to complete or timeout, then return the returncode attribute. The arguments are the same as for the Popen constructor. Example: retcode = call(["ls", "-l"]) """ with Popen(*popenargs, **kwargs) as p: try: return p.wait(timeout=timeout) except: p.kill() p.wait() raise </code></pre> <p>As you can see, it's a thin wrapper around <code>Popen</code>.</p>
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