python, subprocess: reading output from subprocess

Question

I have following script:

#!/usr/bin/python

while True:
    x = raw_input()
    print x[::-1]

I am calling it from ipython:

Answer 1

You're probably tripping over Python's output buffering. Here's what python --help has to say about it.

-u     : unbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x
         see man page for details on internal buffering relating to '-u'