[issue7105] weak dict iterators are fragile because of unpredictable GC runs

[Guido van Rossum]

Guido van Rossum added the comment:

I appreciate the simplicity, but I don't think it is acceptable -- if the dict is large, materializing the entire list of keys/values/items might allocate a prohibitive amount of memory. It's worse if you have code that is expected to break out of the loop.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7105>
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