Collections Python Tutorial

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  4. Double-ended queues, or deques, can be useful when you need to remove elements in the order
from collections  import deque
q = deque(range(5))
q.append(5)
q.appendleft(6)
print q
print q.pop()
print q.popleft()
print q.rotate(3)
print q
print q.rotate(-1)
print q