队列&堆栈

# 1、队列：FIFO先进先出
l=[]
#入队操作
l.append('first')
l.append('second')
l.append('third')
print(l)#['first', 'second', 'third']
#出队操作
print(l.pop(0))#first
print(l.pop(0))#second
print(l.pop(0))#third
#2、堆栈：LIFO后进先出
l=[]
#入栈操作
l.append('first')
l.append('second')
l.append('third')
print(l)#['first', 'second', 'third']
#出栈操作
print(l.pop())#third
print(l.pop())#second
print(l.pop())#first