Nadeem Vawda <nadeem.va...@gmail.com> added the comment:

Reproduced on 3.3 head. Looking at the documentation of the C readline
library, it needs to know the length of the prompt in order to display
properly, so this seems to be an acknowledged limitation of the underlying
library rather than a bug on our side.

Still, this behavior is surprising and undesirable. I would suggest adding
a note to the docs for the readline module, directing users to write:

    input("foo> ")

instead of:

    sys.stdout.write("foo> ")
    input()

----------
nosy: +nadeem.vawda

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12833>
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