STINNER Victor <victor.stin...@haypocalc.com> added the comment:

Oh yeah, original sys.displayhook uses a special hack for the _ global 
variable:
---------
import sys
import builtins

def hook(message):
    if message is None:
        return
    builtins._ = message
    print(ascii(message))

sys.displayhook = hook
---------

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue5110>
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