Python-出队

双端队列或双端队列支持从任一端添加和删除元素。更常用的堆栈和队列是双端队列的简并形式，其中输入和输出仅限于单端。

例子

import collections

DoubleEnded = collections.deque(["Mon","Tue","Wed"])
DoubleEnded.append("Thu")

print ("Appended at right - ")
print (DoubleEnded)

DoubleEnded.appendleft("Sun")
print ("Appended at right at left is - ")
print (DoubleEnded)

DoubleEnded.pop()
print ("Deleting from right - ")
print (DoubleEnded)

DoubleEnded.popleft()
print ("Deleting from left - ")
print (DoubleEnded)

输出

执行上述代码时，会产生以下结果 -

Appended at right - 
deque(['Mon', 'Tue', 'Wed', 'Thu'])
Appended at right at left is - 
deque(['Sun', 'Mon', 'Tue', 'Wed', 'Thu'])
Deleting from right - 
deque(['Sun', 'Mon', 'Tue', 'Wed'])
Deleting from left - 
deque(['Mon', 'Tue', 'Wed'])