一、Python购物流程脚本
半个多月的python学习，花了一天的时间终于写出来了一个简单的购物流程脚本，也算是对Python的一次总结和知识的温习，本人很菜，脚本也非常非常一般。希望在前辈的基础上能更好的学习Python，希望与大家交流。联系方式博客见
此脚本能够实现的实现的功能：
1、通过用户名和密码认证才能登陆购物系统，否者拒绝。
2、认证通过后，用户需要输入工资后会打印一个购物列表，列表中有可以购买的物品。
3、用户可以用自已的工资买购物列表中的物品，前提是自已的工资承受的起，如果承受不起，退出。
4、购买的物品可以加入购物车，也可以从购物车删除。
5、确定购买物品结束后，就可以结算购买物品的总消费金额，然后退出整个系统
此脚本用到python的知识点：
1、流程控制：if | for | while True
2、文件的读取
3、列表的增加和删除
4、模块
5、切片
6、索引
......#!/usr/bin/env python
# Descript message
# Author:Allentuns
# MailBox:zhengyansheng@hytyi.com
# Tel:13260071987
import startup
import sys
userfile = open("user.txt","r")
rss = userfile.readlines()
listpass = []
for line in rss:
line1 = line.split()[0]
listpass.append(line1)
username1 = listpass[0::2]
password1 = listpass[1::2]
while True:
user = raw_input("please input your username:")
user_num = username1.index(user)
user_pas = password1[user_num]
if len(user) == 0:
print "empty user,try again."
continue
elif user in username1:
break
elif user == "q" or user == "quit" or user == "exit":
print "Welcome to come again next time"
sys.exit()
else:
print "%s is not exists,please try again input your name" %(user)
continue
while True:
passwdd = raw_input("please your password:")
if len(passwdd) == 0:
print "Sorry , input your password error , please try again."
#elif passwdd in password1:
elif passwdd == user_pas:
print "\n" + "Welcome to %s login shoppings:" %(user)
break
else:
print "password is Error,please try again."
while True:
try:
salary = int(raw_input("please input your salary:"))
break
except ValueError:
print "please input a number,not string."
file = open('shoplist.txt','r')
for fr in file:
fr = fr.rstrip()
print fr
file.close()
print """Options and arguments:
input "D" : Delete from shoplist into del
input "F" : Return to the total pages
input "T" : Total shoplist"""
products = []
prices = []
file2 = open('shoplist.txt')
fr2 = file2.readlines()
for line in fr2:
p1 = line.split()[0]
p2 = int(line.split()[1])
products.append(p1)
prices.append(p2)
prices = prices
list00 = []
while True:
choose = raw_input("please choose your buy things:")
if choose in products:
product_num = products.index(choose)
product_price = prices[product_num]
if salary > product_price:
print "%s $%d" %(choose,product_price)
list00.append(choose)
print "Add %s into your shoplist" %(choose)
print "You choose to purchase the commodity list:",list00
salary = salary - product_price
else:
if salary < min(prices):
print "Sorry , reset of your salary cannot buy anythings."
sys.exit()
elif choose == "T":
print "salary left :$%s" %(salary)
print "You choose to purchase the commodity list:",list00
sys.exit()
elif choose == "D":
while True:
delchoose = raw_input("your will things remove from into shoplist:")
if delchoose in products:
product_num2 = products.index(delchoose)
product_price2 = prices[product_num2]
salary = salary + product_price2
list00.remove(delchoose)
print list00
print salary
break二、脚本测试
[root@python 20141105]# python list.py
please input your username:allentuns #输入错误的用户名，则登陆失败
allentuns is not exists,please try again input your name
please input your username:ad
ad is not exists,please try again input your name
please input your username:admin #输入正确的用户名后，可以继续输入密码
please your password:000 #密码输入错误后，尝试继续在次输入
password is Error,please try again.
please your password:a
password is Error,please try again.
please your password:000000 #密码输入正确后，可以继续下一步操作
Welcome to admin login shoppings:
please input your salary:20000 #输入工资，打印购物列表
Apple 13500
Iphone 4500
Bike 490
Samsung 2900
Piano 1600
Coffer 35
Options and arguments:
input "D" : Delete from shoplist into del
input "F" : Return to the total pages
input "T" : Total shoplist
please choose your buy things:Apple #选择想要购买的物品1，并加入到购物车
Apple $13500
Add Apple into your shoplist
You choose to purchase the commodity list: ['Apple'] #已经成功加入到购物车
please choose your buy things:Bike #选择想要购买的物品2，并加入到购物车
Bike $490
Add Bike into your shoplist
You choose to purchase the commodity list: ['Apple', 'Bike'] #已经成功加入到购物车
please choose your buy things:Coffer #选择想要购买的物品3，并加入到购物车
Coffer $35
Add Coffer into your shoplist
You choose to purchase the commodity list: ['Apple', 'Bike', 'Coffer']
please choose your buy things:D #如果此时感觉不想买Bike了，可以从购物车将其删除
your will things remove from into shoplist:Bike #删除购物车的物品
['Apple', 'Coffer']
6465
please choose your buy things:T #要购买的物品已经购买完毕，此时可以结账，退出系统
salary left :$6465
You choose to purchase the commodity list: ['Apple', 'Coffer'] #打印购买的物品三、登陆认证用户文件和购物列表文件
[root@python 20141105]# cat user.txt #认证用户和密码列表
jerry
123456
Kimits
873902
admin
000000
[root@python 20141105]# cat shoplist.txt #购物列表单
Apple 13500
Iphone 4500
Bike 490
Samsung 2900
Piano 1600
Coffer 35
