python作业（7.8 —— 7.9）

8.登陆系统

import time
1). Creat :
2). Login :
3). Delete :
4). View :
登陆时判断本次登陆与上次登陆时间的差，如果time<4h，显示，你已经登陆在4小时前。
源代码：

#!/usr/bin/env python# coding:utf-8__author__ = "lvah"import time'''@author:fairy@file:8.py@time:7/10/1711:11 PM@DESC;'''hour = 4 * 60 * 60USER = {}def creat():    name1 = raw_input('new username:')    if name1 not in USER.keys():        pass1 = raw_input('new passwprd:')        USER[name1] = [pass1,0]    else:        print 'the username is existed,please give me a new name!'        creat()def login():    if USER.keys() == 0:        print 'no users exist,please create user'    else:        user_in = raw_input('username:')        pass_in = raw_input('password:')        d1 = time.time()        if USER[user_in][1] == 0:            if user_in in USER.keys() and pass_in == USER[user_in][0]:                USER[user_in][1] = d1                print 'welcome to user system!'            else:                print 'error username or password!'        else:            if user_in in USER.keys() and pass_in == USER[user_in][0]:                if d1 - USER[user_in][1] >= hour:                    print 'wlecome to user system!'                else:                    d2 = (hour - (d1 - USER[user_in][1])) / 60                    print 'you have been login in within 4 hours,please login after %d minutes' % d2            else:                print 'error username or password!'def delete():    user1 = raw_input('username:')    USER.pop(user1)    print 'delete user successful'def view():    print USER.keys()def main():    cho = 'Enter your choice:'    print '''    you can input:    creare(c) login(l)  delete(d) view(v)    '''    while True:        pro = raw_input(cho).lower()        if pro == 'c':            creat()        elif pro == 'l':            login()        elif pro == 'd':            delete()        elif pro == 'v':            view()        else:            print 'error:you can input c l d v'main()

测试：

12.购物车程序需求：

1）启动程序后，让用户输入公子，然后打印商品列表；
2）允许用户根据商品编号购买商品；
3）用户选择商品后，检测余额是否足够，够就直接扣款，不够就提醒；
4）可随时退出，退出时打印已购买的商品和余额；
your salary:
1 ipthon 5800
2 book 100
3 bike 200
>>>:1
added [ipthon] to your shopping
>>>:3
added [bike] to your shopping
>>>:q

have bought below:

#!/usr/bin/env python# coding:utf-8_author_ = "lvah"'''@author:fairy@file:homework_shopping.py@contact:[e-mail]@time:7/9/1711:17 AM@DESC;'''shopinfo = [    ['Iphon', 1000],    ['book', 200],    ['fentiao', 3500]]BUY =[]def buy():    a = input('请输入工资:')    print '商品列表:'    for num, shanping in enumerate(shopinfo):        print  num, shanping[0],shanping[1]    num1 = input('请输入商品编号:')    if a < shopinfo[num1][1]:        print '余额不足'    else:        a1 = a - shopinfo[num1][1]        BUY.append(shopinfo[num1][0])        print '余额:%d\n%s 购买成功' % (a1,shopinfo[num1][1])def main():    print '''欢迎进入购物车系统你可以：购买（B）退出（Q）    '''    pro = raw_input('请输入选择:').lower()    if pro == 'q':        print '退出系统'    elif pro == 'b':        buy()    else:        print '你可以输入B , Q'main()

map/reduce练习题

（1）利用map()函数，把用户输入的不规范英文名字，变为首字母大写，其他小写的规范名字。输入：[‘adam’,’LISA’,’barT’]，输出：[‘Adam’,’Lisa’,’Bart’]。

#!/usr/bin/env python#coding:utf-8__author__ = "lvah"'''@author:fairy@file:map.py@time:7/11/179:12 PM@DESC;'''def f(li):    return li.title()print map(f,['adad','ASE','adaRR'])

测试：

（2）Python提供的sum()函数可以接受一个list并求和，请编写一个prod()函数，可以接受一个list并利用reduce()求积

#!/usr/bin/env python# coding:utf-8__author__ = "lvah"'''@author:fairy@file:reduce.py@time:7/11/179:24 PM@DESC;'''def f(x, y):    return x * ydef prod(li):    return reduce(f, li)print prod([3,5,4,7])

测试：