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class Queue:

def __init__(self):

self.items = []

def isEmpty(self):

return self.items == []

def enqueue(self, item):

self.items.insert(0, item)

def dequeue(self):

return self.items.pop()

def size(self):

return len(self.items)

q = Queue()

q.enqueue(4)

q.enqueue('god')

q.enqueue(True)

print(q.dequeue())

def hotPotato(namelist, num):

simqueue = Queue()

for name in namelist:

simqueue.enqueue(name)

while simqueue.size() > 1:

for i in range(num):

simqueue.enqueue(simqueue.dequeue())

simqueue.dequeue()

return simqueue.dequeue()

print(hotPotato(["Bill","David","Susan","Jane","Kent","Brad"],7))

# 设计一个良策都能插入删除的队列deque

class Deque:

def __init__(self):

self.items = []

def isEmpty(self):

return self.items == []

def addRear(self, item):

self.items.insert(0, item)

def addFront(self, item):

self.items.append(item)

def removeFront(self):

return self.items.pop()

def removeRear(self):

return self.items.pop(0)

def size(self):

return len(self.items)

# 利用Deque解决回文字符串

def palcheker(aString):

chardeque = Deque()

for ch in aString:

chardeque.addFront(ch)

stillEqual = True

while chardeque.size() > 1 and stillEqual:

first = chardeque.removeFront()

last = chardeque.removeRear()

if first != last:

stillEqual = False

return stillEqual

print(palcheker('lsdkjfskf'))

print(palcheker('radar'))