标签：python 字典 循环
最近学习了Python的一些基础数据结构，这里通过一个小程序做一个小的总结，自己比较偏好字典，故程序中主要使用字典数据结构。
1. 通过用户名和密码认证才能登陆系统，注册后需登陆。
2. 认证通过后，系统会给出几个旅行计划，计划中有可以选择的目的地及旅行天数。
3. 确定购买结束后，结算总消费金额并退出。
期望用到的python知识点有：
1.通用序列的操作和列表的方法。
2.字典的方法。
3.流程控制。
import time
#create authentification list
authlist={‘zhang01‘:‘1234qwer‘,‘lee10‘:‘1qaz‘,‘wang33‘:‘567890‘}
user=raw_input(‘please enter your username: ‘)
passwd=raw_input(‘please enter your password: ‘)
#for key,value in authlist.items():
# if user== key and passwd==value:
# print ‘login successful!‘
# elif user!=key:
# print ‘no such account!‘
# elif passwd!=value:
# print ‘invalid passwd!‘
# break
#login verification
#尝试用循环遍历字典方法，但未成功。
while True:
if user in authlist:
if passwd==authlist.get(user):
print ‘login successful!‘
break
else:
print ‘invalid password!‘
passwd=raw_input(‘please enter your password: ‘)
continue
else:
print ‘no such account,please register!‘
newuser= raw_input(‘please enter a username: ‘)
if newuser not in authlist:
print ‘username is ok!‘
newpasswd=raw_input(‘please enter a password: ‘)
authlist.setdefault(newuser,newpasswd)
print ‘register successful!‘
break
else: print ‘username is already existed!‘
#travel plans offer
c1={‘1‘:100,‘3‘:300,‘5‘:500,‘14‘:1000}
c2={‘1‘:300,‘3‘:500,‘5‘:700,‘14‘:1300}
c3={‘1‘:500,‘3‘:700,‘5‘:900,‘14‘:1500}
c4={‘1‘:700,‘3‘:900,‘5‘:1000,‘14‘:1700}
costs=dict(domestic=c1, japan=c2,europe=c3,usa=c4)
print ‘the costs for different destinations for 1,3,5,14 days: \n‘, costs
print ‘\n‘
time.sleep(3)
shlist={}
index=0
a=1
cost=0
d=0
while a:
dest=raw_input(‘please choose your destionation: ‘)
days=raw_input(‘please choose your days of staying: ‘)
cost=costs[dest][days]
print ‘you want to spend %s days in %s,and the cost is $%s ‘% (days,dest,cost)
shlist[index]=(dest,days,cost)
index +=1
d +=cost
con=raw_input(‘are you done shopping? yes(Y) or no(N): ‘)
if con==‘Y‘:a=0
else:a=1
print ‘your shopping cart has %d item:%s, total cost is $%d‘ %(index,shlist.values(),d)
key=raw_input( ‘do you want to check out(C) or delete some item in shopping list(D)?‘)
if key == ‘C‘:
print ‘your current shopping list is: ‘
print shlist
print ‘please pay $%d‘ %d
if key == ‘D‘:
print shlist
k=raw_input( ‘please enter the item number you want to delete in your shopping list: ‘)
shlist.pop(int(k))
if shlist=={}:
print ‘your current shopping list is empty‘
else:
print ‘your current shopping list is: ‘
print shlist参照 http://467754239.blog.51cto.com/4878013/1572203 （全部用列表实现）还有以下几点可以改进：
autenlist和travelplans可以单独存放于txt文件,用open打开，readlines读取。
通过index返回list中某元素位置，再以此访问与其对应的list中该位置的值。
可以增加一个预算和余额功能。
python 学习笔记-山寨携程(列表，字符串,字典和流程控制总结)
标签：python 字典 循环
原文地址：http://bretoncrepe.blog.51cto.com/9590251/1587685
