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Decorator: as I tried to say in msg270456, the two examples are artificial tests stripped to the bare minimum. So is use of email and charset, other than the fact that it exists in 2.7 as well as current 3.x.
The real situation where this issue came up for me is the subprocess that IDLE uses to execute user code, separate as much as possible from IDLE code. idlelib.run imports tkinter. It them imports a few other idlelib modules that collectively import at least tkinter.font, tkinter.messagebox, and tkinter.simpledialog. These indirect imports change the tkinter module. Consequently, when users submit code such as
import tkinter as tk
root = tk.Tk()
myfont = tk.font.Font(...) # tk.font should raise NameError
it runs. But when they try to run their 'correct' program directly with Python, they get the NameError and must add, for instance, 'import tk.font'. IDLE should help people write standard python code, not python with a few custom augmentations.
My first attempt to fix this was to have run execute 'del tkinter.font', etcetera after the indirect imports are done. Then users would get the NameError they should. But currently, they would continue getting the NameError even after adding the needed import. This is because the first font import in *their* code is the second or later font import in the process. My second example is a condensed version of this failure.