STINNER Victor added the comment:

+    cmd = 'LC_ALL=C %s %s 2>/dev/null' % (executable, '-ia')

It's safer to use the subprocess module instead of using a shell (see the 
recent Shellshock story) to change the environment variables and to redirect 
stderr. subprocess now has a convinient subprocess.DEVNULL. So it's something 
like:

env = os.environ.copy()
env['LC_ALL'] = 'C'
process = subprocess.Popen([executable, '-ia'], stderr=subprocess.DEVNULL)
...

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17293>
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