How Can Python's `collections.deque` Optimize List Rotation?

Efficient List Rotation in Python: An Alternative Approach

The provided Python code efficiently rotates a list by slicing and combining its sections. However, there exists a more optimized solution using collections.deque.

Utilizing deque's Rotate Method

deque is a data structure designed for efficient insertion and deletion at both ends. It offers a dedicated rotate() method for rotating its elements. This approach is particularly advantageous for large lists.

from collections import deque

items = deque([1, 2])
items.append(3)        # deque == [1, 2, 3]
items.rotate(1)        # deque == [3, 1, 2]
items.rotate(-1)       # Returns deque to original state: [1, 2, 3]
item = items.popleft() # deque == [2, 3]

In the above example:

• Items are added to the deque using append().
• rotate(1) rotates the deque one position to the right (clockwise).
• rotate(-1) rotates it one position to the left (counterclockwise).
• popleft(), like rotate(), efficiently removes an element from the left end.

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