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From: Serhiy Storchaka <storchaka@gmail.com>
Subject: Re: "convert" string to bytes without changing data (encoding)
Date: Fri, 30 Mar 2012 22:06:45 +0300
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Xref: csiph.com comp.lang.python:22390

28.03.12 21:13, Heiko Wundram написав(ла):
> Reading from stdin/a file gets you bytes, and
> not a string, because Python cannot automagically guess what format the
> input is in.

In Python3 reading from stdin gets you string. Use sys.stdin.buffer.raw 
for access to byte stream. And reading from file opened in text mode 
gets you string too.