48 lines
1.3 KiB
Python
48 lines
1.3 KiB
Python
'''
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File: deque.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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import os.path as osp
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import sys
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sys.path.append(osp.dirname(osp.dirname(osp.abspath(__file__))))
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from include import *
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from collections import deque
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if __name__ == "__main__":
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""" 初始化双向队列 """
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duque = deque()
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""" 元素入队 """
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duque.append(2) # 添加至队尾
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duque.append(5)
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duque.append(4)
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duque.appendleft(3) # 添加至队首
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duque.appendleft(1)
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print("双向队列 duque = ", duque)
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""" 访问队首元素 """
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peekFirst = duque[0] # 队首元素
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print("队首元素 peekFirst = ", peekFirst)
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peekLast = duque[-1] # 队尾元素
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print("队尾元素 peekLast = ", peekLast)
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""" 元素出队 """
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popFirst = duque.pop() # 队首元素出队
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print("队首出队元素 popFirst= ", popFirst)
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print("队首出队后 duque = ", duque)
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popLast = duque.popleft() # 队尾元素出队
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print("队尾出队元素 popLast= ", popLast)
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print("队尾出队后 duque = ", duque)
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""" 获取双向队列的长度 """
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size = len(duque)
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print("双向队列长度 size = ", size)
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""" 判断双向队列是否为空 """
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is_empty = len(duque) == 0
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print("双向队列是否为空 = ", is_empty)
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