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'])