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It seems to me that the python-dev discussion didn't reach a
conclusion. My patch is a sort of a workaround that lets you
use Tk interactively from IDLE - it doesn't really invoke
PyOS_InputHook. Since Tk always sets itself as
PyOS_InputHook, it solves the Tk problem, which I think is
the most common one.

A more "correct" approach, which can be easily implemented,
is to give a Python API that will call PyOS_InputHook. This
would enable IDLE to imitate the exact behaviour of the
textual interactive interpreter. It would have to be written
in C, of course, and the question is where to put that C
function: should it be in a C module which comes with IDLE,
like the old "interrupt" module, or should a function be
added to the "sys" or "os" modules?