bug#17304: Python mode delays evaluation

[Glenn Morris]

Márton Marczell wrote:

> When I run a Python 3.3.4 prompt inside Emacs 24.3 on Windows 7, correct
> commands are evaluated immediately, but incorrect ones are delayed (I have
> to press Enter one more time), as seen below:
>
>     >>> 1
>     1
>     >>> nonsense
>     >>>
>     Traceback (most recent call last):
>     File "<stdin>", line 1, in <module>
>     NameError: name 'nonsense' is not defined
[...]
> In GNU Emacs 24.3.1 (i386-mingw-nt6.1.7601)

FWIW, I cannot reproduce this with Emacs 24.3 and Python 3.4.0 on GNU/Linux.