Could you explain this rebinding (or some other action) on "nums = nums"?
Erik
python at lucidity.plus.com
Tue Dec 1 17:34:13 EST 2015
On 01/12/15 21:37, Denis McMahon wrote:
> The assignment succeeds. That's imo a bug. If it's a TypeError to try and
> assign a value to tup[1], then tup[1] should not allow the mutated list
> to be assigned.
Nothing got assigned.
That original list object remains in that slot. However, it has been
mutated since it was originally assigned.
But I can see what you're getting at - what you're asking for is that
the *container* object whose element is being assigned to is first
queried as to whether it will accept a mutated element being assigned to
it before that element is mutated.
This looks to be a fundamental issue with the augmented assignment
mechanism.
E.
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