newbie trouble with raw_input and idle

[The Well of Latis]

If I enter the following code (or any other using raw_input for that
matter) into idle's shell it works, when trying to run it from a file
(new window, edit it, save it then run it, nada)

def f():
    x=raw_input("ladida:")
    print x

f()

systems involved are a win98 and an nt4 machines, tcl version 8.0.5,
Python 1.5.2. The same code works under the plain Python interactive
shell, and pythonwin, but not idle. Any ideas?

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