On Thu, Jan 31, 2013 at 5:53 PM, Hugo Arts <[email protected]> wrote:
>
>>>> a = ([], [])
>>>> a[0] += [1]
> TypeError: 'tuple' object does not support item assignment
>>>> a
> ([1], [])

Yep, storing the result fails for a read-only subscript or attribute
(e.g. a property without fset), but only after the in-place op
executes. Solution: don't do that. ;)
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