Matthew Brett added the comment:

To clarify from comments on issue 19332:

"""
* The normal rule (not just for Python) is that a data structures have 
undefined behavior for mutating while iterating, unless there is a specific 
guarantee
"""

The change in Python 3.6 is just a different undefined behavior.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29420>
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