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    <p>If you are talking about the python interpreter or CMD.exe that is the 'parent' of your script then no, it isn't possible. In every POSIX-like system (now you're running Windows, it seems, and that might have some quirk I don't know about, YMMV) each process has three streams, standard input, standard output and standard error. Bu default (when running in a console) these are directed to the console, but redirection is possible using the pipe notation:</p> <pre><code>python script_a.py | python script_b.py </code></pre> <p>This ties the standard output stream of script a to the standard input stream of script B. Standard error still goes to the console in this example. See the article on <a href="http://en.wikipedia.org/wiki/Standard_streams" rel="nofollow noreferrer">standard streams</a> on Wikipedia.</p> <p>If you're talking about a child process, you can launch it from python like so (stdin is also an option if you want two way communication):</p> <pre><code>import subprocess # Of course you can open things other than python here :) process = subprocess.Popen(["python", "main.py"], stdout=subprocess.PIPE, stderr=subprocess.PIPE) x = process.stderr.readline() y = process.stdout.readline() process.wait() </code></pre> <p>See the Python <a href="http://docs.python.org/lib/module-subprocess.html" rel="nofollow noreferrer">subprocess</a> module for information on managing the process. For communication, the process.stdin and process.stdout pipes are considered standard <a href="http://docs.python.org/lib/bltin-file-objects.html" rel="nofollow noreferrer">file objects</a>.</p> <p>For use with pipes, reading from standard input as <a href="https://stackoverflow.com/questions/24931/how-to-capture-python-interpreters-andor-cmdexes-output-from-a-python-script#24939">lassevk</a> suggested you'd do something like this:</p> <pre><code>import sys x = sys.stderr.readline() y = sys.stdin.readline() </code></pre> <p>sys.stdin and sys.stdout are standard file objects as noted above, defined in the <a href="http://docs.python.org/lib/module-sys.html" rel="nofollow noreferrer">sys</a> module. You might also want to take a look at the <a href="http://docs.python.org/lib/module-pipes.html" rel="nofollow noreferrer">pipes</a> module.</p> <p>Reading data with readline() as in my example is a pretty naïve way of getting data though. If the output is not line-oriented or indeterministic you probably want to look into <a href="http://docs.python.org/lib/poll-objects.html" rel="nofollow noreferrer">polling</a> which unfortunately does not work in windows, but I'm sure there's some alternative out there.</p>
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    1. POHow to capture Python interpreter's and/or CMD.EXE's output from a Python script?
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    1. USHenrik Gustafsson
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    1. POHow to capture Python interpreter's and/or CMD.EXE's output from a Python script?
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    1. CONote that when invoking Python using subprocess.Popen() it's often helpful to pass the "-u" flag, which disables buffering on stdin/stdout/stderr. Python does not autoflush stdout when the child begins reading stdin, if output has been redirected to a pipe, so you can end up blocking forever reading output that is buffered. I encountered this problem trying to wrap/automate pdb.
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