Книга: Learning Concurrency in Python
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Breaking it down

In the preceding example, we create our standard deque and pass in our regular one to six values. We then print out our default deque, and then rotate it three places to the right.

Upon rotation, all of the elements in our deque object move three places to the right; the last element in our queue becomes the first, and then the second, and subsequently, the third.

This diagram succinctly shows how we can rotate both forward and backwards using positive and negative values:

Source: http://www.transtutors.com/homework-help/accounting/inventory-valuation-lifo/
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Дальше: Output

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