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Mon Jan 28 22:44:38 CET 2008 · https://mail.python.org/pipermail/python-dev/2008-January/076607.html

> While I couldn't locate such a document, it makes sense when you 
> consider that if such a process is part of a pipeline you really don't 
> want the prompts being handled as input by the downstream processes.
> 
> That's why mv and similar utilities prompt on standard error.

No, that doesn't really make sense. If you are in the middle of a pipe,
what good does it do to write the prompt to stderr, yet read the user
input from stdin?

If you really care about processes that run in a pipe, interact
with /dev/tty.

Regards,
Martin

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[Python-Dev] Incorrect documentation of the raw_input built-in function