[issue40327] list(sys.modules.items()) can throw RuntimeError: dictionary changed size during iteration

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

We should consider making this change just about everywhere in the standard library.  Besides avoiding a race condition, running a for loop over `d.copy().items()` is more memory efficient and possibly faster than a for loop over `list(d.items())`.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40327>
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