python3 deque(双向队列)

xiaoxiao2021-02-28  49

创建双向队列

import collections d = collections.deque()

append(往右边添加一个元素)

import collections d = collections.deque() d.append(1) d.append(2) print(d) #输出:deque([1, 2])

appendleft(往左边添加一个元素)

import collections d = collections.deque() d.append(1) d.appendleft(2) print(d) #输出:deque([2, 1])

clear(清空队列)

import collections d = collections.deque() d.append(1) d.clear() print(d) #输出:deque([])

copy(浅拷贝)

import collections d = collections.deque() d.append(1) new_d = d.copy() print(new_d) #输出:deque([1])

count(返回指定元素的出现次数)

import collections d = collections.deque() d.append(1) d.append(1) print(d.count(1)) #输出:2

extend(从队列右边扩展一个列表的元素)

import collections d = collections.deque() d.append(1) d.extend([3,4,5]) print(d) #输出:deque([1, 3, 4, 5])

extendleft(从队列左边扩展一个列表的元素)

import collections d = collections.deque() d.append(1) d.extendleft([3,4,5]) print(d) # # #输出:deque([5, 4, 3, 1])

index(查找某个元素的索引位置)

import collections d = collections.deque() d.extend(['a','b','c','d','e']) print(d) print(d.index('e')) print(d.index('c',0,3)) #指定查找区间 #输出:deque(['a', 'b', 'c', 'd', 'e']) # 4 # 2

insert(在指定位置插入元素)

import collections d = collections.deque() d.extend(['a','b','c','d','e']) d.insert(2,'z') print(d) #输出:deque(['a', 'b', 'z', 'c', 'd', 'e'])

pop(获取最右边一个元素,并在队列中删除)

import collections d = collections.deque() d.extend(['a','b','c','d','e']) x = d.pop() print(x,d) #输出:e deque(['a', 'b', 'c', 'd'])

popleft(获取最左边一个元素,并在队列中删除)

import collections d = collections.deque() d.extend(['a','b','c','d','e']) x = d.popleft() print(x,d) #输出:a deque(['b', 'c', 'd', 'e'])

remove(删除指定元素)

import collections d = collections.deque() d.extend(['a','b','c','d','e']) d.remove('c') print(d) #输出:deque(['a', 'b', 'd', 'e'])

reverse(队列反转)

import collections d = collections.deque() d.extend(['a','b','c','d','e']) d.reverse() print(d) #输出:deque(['e', 'd', 'c', 'b', 'a'])

rotate(把右边元素放到左边)

import collections d = collections.deque() d.extend(['a','b','c','d','e']) d.rotate(2) #指定次数,默认1次 print(d) #输出:deque(['d', 'e', 'a', 'b', 'c'])

 原文链接:http://www.cnblogs.com/zhenwei66/p/6598996.html

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