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#!/usr/bin/env python

# coding:utf-8

'''

欢迎参加黄哥python远程视频培训,

帮你完成从不会写代码到会写代码解决问题的过渡。

https://github.com/pythonpeixun/article/blob/master/index.md

咨询qq:1465376564

黄哥Python培训黄哥改写

Python 3

P148页代码

'''

queue = []

def enQ():

queue.append(input('Enter new queue element: '))

def deQ():

if len(queue) == 0:

print('Cannot dequeue from empty queue!')

else:

print('Removed [', queue.pop(0), ']')

def viewQ():

print(str(queue))

def showmenu():

prompt = """

(E)nqueue

(D)equeue

(V)iew

(Q)uit

Enter choice: """

done = 0

while not done:

chosen = 0

while not chosen:

try:

choice = input(prompt)[0]

except (IndexError, EOFError, KeyboardInterrupt):

choice = 'q'

print('\nYou picked: [%s]' % choice)

if choice not in 'devq':

print('invalid option, try again')

else:

chosen = 1

if choice == 'q':

done = 1

if choice == 'e':

enQ()

if choice == 'd':

deQ()

if choice == 'v':

viewQ()

if __name__ == '__main__':

showmenu()