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40 lines
918 B
40 lines
918 B
"""
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File: queue.py
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Created Time: 2022-11-29
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Author: Peng Chen (pengchzn@gmail.com)
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"""
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from collections import deque
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"""Driver Code"""
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if __name__ == "__main__":
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# 初始化队列
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# 在 Python 中，我们一般将双向队列类 deque 看作队列使用
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# 虽然 queue.Queue() 是纯正的队列类，但不太好用
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que: deque[int] = deque()
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# 元素入队
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que.append(1)
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que.append(3)
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que.append(2)
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que.append(5)
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que.append(4)
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print("队列 que =", que)
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# 访问队首元素
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front: int = que[0]
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print("队首元素 front =", front)
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# 元素出队
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pop: int = que.popleft()
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print("出队元素 pop =", pop)
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print("出队后 que =", que)
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# 获取队列的长度
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size: int = len(que)
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print("队列长度 size =", size)
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# 判断队列是否为空
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is_empty: bool = len(que) == 0
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print("队列是否为空 =", is_empty)
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