Wrapping stdout in a codec

[JKPeck]

We want to wrap the stdout device in a codec in order to decode output
transparently according to a particular code page (which might not be
the system code page).  However, codec.open requires a filename, and
stdout may be a tty or otherwise anonymous.  How can we accomplish
this wrapping?  Our application may be loaded into a Python program
that has already set up stdout.

TIA,
Jon Peck