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    <p>You can redirect to a file if you just want the output in a file for later evaluation.</p> <p>Your already defining the stdout/stderr of the processes your executuing by the stdout=/stderr= methods.</p> <p>In your example code your just redirecting to the scripts current out/err assigments.</p> <pre><code>subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE) </code></pre> <p>sys.stdout and sys.stderr are just file-like objects. As the documentation documentation on <a href="http://docs.python.org/library/sys.html?highlight=stdout#sys.stdout" rel="nofollow noreferrer">sys.stdout</a> mentions, "Any object is acceptable as long as it has a write() method that takes a string argument."</p> <pre><code>f = open('cmd_fileoutput.txt', 'w') subprocess.Popen(cmd, shell=True, stdout=f, stderr=f) </code></pre> <p>So you only need to given it a class with a write method in order to re-direct output.</p> <p>If you want both console output and file output may be making a class to manage the output.</p> <p>General redirection:</p> <pre><code># Redirecting stdout and stderr to a file f = open('log.txt', 'w') sys.stdout = f sys.stderr = f </code></pre> <p>Making a redirection class:</p> <pre><code># redirecting to both class OutputManager: def __init__(self, filename, console): self.f = open(filename, 'w') self.con = console def write(self, data): self.con.write(data) self.f.write(data) new_stdout = OutputManager("log.txt", sys.stdout) </code></pre> <p>Interleaving is dependant on buffering, so you may or may not get the output you expect. (You can probably turn off or reduce the buffering used, but I don't remember how at the moment)</p>
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    1. PONeed a better way to execute console commands from python and log the results
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    1. COos.write(self.f.fileno(), data) is unbuffered if you need to be sure
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      1. USAli Afshar
    2. CO+1 I had not realized that python duck typing could be leveraged here by providing my own File object implementation. I'll give it a go and will post an updated "execute" function if it works.
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      1. USWim Coenen
    3. COwconenen - Yes, this is a great feature of python, you can easily replace interfaces by imitation.
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