[issue29202] Improve dict iteration

[Raymond Hettinger]

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

This doesn't meet our criteria for backports.

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assignee: rhettinger -> serhiy.storchaka
versions:  -Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue29202>
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