Davide Okami added the comment:

Sorry for my bad technical acknowledgment, i will try to be more understandable.
Declaring a while loop statement, and launching the loop pressing enter, it is 
possible to delete loop results and return to the while declaration statement 
deleting it [1] or it's possibile to make it disappear from the line in which 
it was declared [2] [[2] making it appear on the loop result (overlaying it)] 
without breaking the loop execution [1][2]. Both are possible keeping pressed 
the shortcut command+z (⌘+z) after that loop runs (keeping it pressed until the 
loop statement is reached and deleted [1], or keeping it pressed for a little 
less time than before, to manifest the second behavior). The bug afflicts 
Python IDLE for OS X (i tried with a clean installation of Python 3.4.3 and i 
tried it also on Windows without results) in versions 2.7.8, 3.4.x (as i tried).

----------
title: Idle: conflict between generic cycle and undo shortcut. -> Idle: 
conflict between loop execution and undo shortcut.
versions: +Python 3.2, Python 3.3 -Python 3.5

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<http://bugs.python.org/issue23616>
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