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From: Gregory Ewing <greg.ewing@canterbury.ac.nz>
Newsgroups: comp.lang.python
Subject: Re: Help with pipes, buffering and pseudoterminals
Date: Wed, 08 Apr 2015 12:23:24 +1200
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Chris Angelico wrote:
> Really? I can believe that stdout and stderr are initially duplicates,
> but stdin as well? Isn't stdin opened for reading only, and
> stdout/stderr for writing only?

It depends entirely on how the process that forked your
shell process set things up, but a quick experiment I
just did in a MacOSX terminal window suggests that it's
not really bothered about that distinction:

sh-3.2$ echo foo >&0
foo

-- 
Greg