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- from collections import Counter, deque
- q = deque()
- q.append(1)
- q.append(2)
- q.appendleft(3)
- q.append(4)
- assert len(q) == 4
- assert q == deque([3, 1, 2, 4])
- assert q.popleft() == 3
- assert q.pop() == 4
- assert len(q) == 2
- assert q == deque([1, 2])
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