Serhiy Storchaka added the comment:

Bad things happen not only when a list shrinks, but also when it grows during 
iteration.

The one solution is to check if the size is changed on every iteration. The 
other solution is to convert a list to a tuple for iterating.

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versions: +Python 2.7 -Python 3.4
Added file: http://bugs.python.org/file44838/issue24098-check-size.patch

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<http://bugs.python.org/issue24098>
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