The order of iterable de-referencing in assignment?

[Joaquin Alzola]

>> One might guess a.extend(a) would turn into an infinite loop.  It turns out here Python first gets all the items of `a' and then append them to `a', so the infinite loop is avoided.
>>> a = [1,2]
>>> for x in a: a.append(x)
>...
>^CTraceback (most recent call last):
 > File "<stdin>", line 1, in <module>
>KeyboardInterrupt
>>>> len(a)
>6370805

>That right there, folks, is an infinite loop.

If I am correct python points out an infinite loop with the "...", just pointing to more information.
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