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    <p>Make the pipes non-blocking by using <a href="http://docs.python.org/library/fcntl.html#fcntl.fcntl" rel="noreferrer"><code>fcntl.fcntl</code></a>, and use <a href="http://docs.python.org/library/select.html#select.select" rel="noreferrer"><code>select.select</code></a> to wait for data to become available in either pipe. For example:</p> <pre><code># Helper function to add the O_NONBLOCK flag to a file descriptor def make_async(fd): fcntl.fcntl(fd, fcntl.F_SETFL, fcntl.fcntl(fd, fcntl.F_GETFL) | os.O_NONBLOCK) # Helper function to read some data from a file descriptor, ignoring EAGAIN errors def read_async(fd): try: return fd.read() except IOError, e: if e.errno != errno.EAGAIN: raise e else: return '' process = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE) make_async(process.stdout) make_async(process.stderr) stdout = str() stderr = str() returnCode = None while True: # Wait for data to become available select.select([process.stdout, process.stderr], [], []) # Try reading some data from each stdoutPiece = read_async(process.stdout) stderrPiece = read_async(process.stderr) if stdoutPiece: print stdoutPiece, if stderrPiece: print stderrPiece, stdout += stdoutPiece stderr += stderrPiece returnCode = process.poll() if returnCode != None: return (returnCode, stdout, stderr) </code></pre> <p>Note that <code>fcntl</code> is only available on Unix-like platforms, including Cygwin.</p> <p>If you need it to work on Windows without Cygwin, it's doable, but it's much, much tougher. You'll have to:</p> <ul> <li>Use the <a href="http://sourceforge.net/projects/pywin32/" rel="noreferrer">pywin32</a> library to call through to the native Win32 API</li> <li>Use <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa365787%28v=VS.85%29.aspx" rel="noreferrer"><code>SetNamedPipeHandleState</code></a> with <code>PIPE_NOWAIT</code> to make the stdout and stderr pipes non-blocking</li> <li>Use <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms687025%28v=vs.85%29.aspx" rel="noreferrer"><code>WaitForMultipleObjects</code></a> instead of <code>select</code> to wait for data to become available</li> <li>Use <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa365467%28v=vs.85%29.aspx" rel="noreferrer"><code>ReadFile</code></a> to read the data</li> </ul>
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    1. POHow can I print and display subprocess stdout and stderr output without distortion?
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    1. USAdam Rosenfield
    1. USAdam Rosenfield
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    1. POHow can I print and display subprocess stdout and stderr output without distortion?
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    1. COCan this also be done in windows? I looks like `fcntl` is unix only, and `select` has some stipulations as well. I should have mentioned in my question the solution needs to be cross platform. I'll add that. This is still pretty cool though! Thanks!
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      1. USperden
    2. COI note that fcntl is only for Unix like platforms. If he's on a windows box, or wants this to be agnostic, then this solution won't work.
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    3. CO@perden: See edit
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