variable scope in try ... EXCEPT block.
e+python-list at kellett.im
Thu Jul 12 08:31:57 EDT 2018
On 2018-07-12 10:59, Steven D'Aprano wrote:
> On Thu, 12 Jul 2018 01:37:24 -0700, aleiphoenix wrote:
>> My question is, does except ... as ... create a new scope from outer
>> block, causing 'err' be hidden from outer scope? Is this intentional?
> No, it is not a new scope, and yes, it is intentional. It's a nasty hack,
> but a *necessary* nasty hack: when the except block exits, the "err"
> local variable (or whatever it happens to be called) is implicitly
> You can work around this by explicitly assigning to another local
> except Exception as e:
> err = e # only "e" will be deleted when we exit the block
> This is necessary in Python 3 [...]
"necessary" is debatable. When we have reference counting, general
garbage collection, *and* nasty hacks like this, one could be forgiven
for thinking Python has chosen the worst of all memory-management worlds.
That said, in this case it's entirely livable-with once one knows about it.
Unrelatedly, having stared at this email for a moment, I really wish
Thunderbird had an option to avoid orphan
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