On Tue, 09 Oct 2007 18:08:34 +0000, Steven D'Aprano wrote:
>>>> L = []
>>>> id(L)
> 3083496716L
>>>> L += [1]
>>>> id(L)
> 3083496716L
>
> It's the same L, not rebound at all.
It *is* rebound. To the same object, but it *is* assigned to `L` and not
just mutated in place.
In [107]: class A:
.....: a = list()
.....:
In [108]: class B(A):
.....: pass
.....:
In [109]: B.a += [42]
In [110]: A.a
Out[110]: [42]
In [111]: B.a
Out[111]: [42]
If it was just mutation then `B.a` would have triggered an `AttributeError`.
Ciao,
Marc 'BlackJack' Rintsch
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