[Python-Dev] Making sure dictionary adds/deletes during iteration always raise exception

Chris Angelico rosuav at gmail.com
Tue Dec 13 12:55:20 EST 2016


On Wed, Dec 14, 2016 at 4:48 AM, Guido van Rossum <guido at python.org> wrote:
> IIUC the private version gets updated every time the dict gets modified --
> but what we need here should only trigger when a key is added or removed,
> not when a value is updated.

Is it possible to add a key, triggering a resize of the dict, then
remove one, and continue iterating through the old (deallocated)
memory? If so, that could potentially cause a crash.

ChrisA


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