Serhiy Storchaka added the comment:

When appending fails, the deque is left in changed state. I would do it in 
different way. First append new item (can fail), and then make circular shift 
(never fail). This also should be faster (up to 2 times). Most code can be 
shared between rotate() and circular shift operation.

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23704>
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