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POWrap subprocess' stdout/stderr
 

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    <p>I'd like to both capture and display the output of a process that I invoke through Python's subprocess.</p> <p>I thought I could just pass my file-like object as named parameter stdout and stderr</p> <p>I can see that it accesses the <code>fileno</code>attribute - so it is doing something with the object. However, the <code>write()</code> method is never invoked. Is my approach completely off or am I just missing something?</p> <pre><code>class Process(object): class StreamWrapper(object): def __init__(self, stream): self._stream = stream self._buffer = [] def _print(self, msg): print repr(self), msg def __getattr__(self, name): if not name in ['fileno']: self._print("# Redirecting: %s" % name) return getattr(self._stream, name) def write(self, data): print "###########" self._buffer.append(data) self._stream.write(data) self._stream.flush() def getBuffer(self): return self._buffer[:] def __init__(self, *args, **kwargs): print "&gt;&gt; Running `%s`" % " ".join(args[0]) self._stdout = self.StreamWrapper(sys.stdout) self._stderr = self.StreamWrapper(sys.stderr) kwargs.setdefault('stdout', self._stdout) kwargs.setdefault('stderr', self._stderr) self._process = subprocess.Popen(*args, **kwargs) self._process.communicate() </code></pre> <h2>Update:</h2> <p>Something I'd like to work as well, is the ANSI control characters to move the cursor and override previously output stuff. I don't know whether that is the correct term, but here's an example of what I meant: I'm trying to automate some GIT stuff and there they have the progress that updates itself without writing to a new line each time.</p> <h2>Update 2</h2> <p>It is important to me, that the output of the subprocess is displayed immediately. I've tried using subprocess.PIPE to capture the output, and display it manually, but I was only able to get it to display the output, once the process had completed. However, I'd like to see the output in real-time.</p>
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    1. COWindows or Unix?
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    2. COI'd prefer it to be a cross-platform compatible solution.
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    3. COrelated: [Python subprocess get children's output to file and terminal?](http://stackoverflow.com/q/4984428/4279)
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