要求：
一、启动程序后，选择是商家还是用户
1、选择商家用户
输入用户名，密码进入
选择增加商品及价格：格式： 商品名称 价格
选择编辑商品及价格：根据提示进行操作
2、选择用户
输入用户名，密码进入
判断是否是第一次登录，如果是，提示进行充值
充值完成，显示商品列表，输入商品名称进行购买，检测余额是否够，够就直接扣款，不够提示余额不足。
3、可随时退出，退出时，打印已购买商品和余额。
python 版本 3.5
主函数：
#Author by Andy
#_*_ coding:utf-8 _*_
import sys,time,os
sys.path.append("E:my python studyday2")
import login_new
#定义显示商品列表函数
def product_list():
with open(r'E:my python studyfilesproduct_list.txt',encoding='utf-8') as f:
for index,item in enumerate(f.readlines()):
print(item,end='')
print('
')
#定义增加商品函数
def add_product():
while True:
with open(r'E:my python studyfilesproduct_list.txt', 'a+', encoding='utf-8') as f:
Product=input('请输入增加的商品名称及价格:')
if Product=='q' or Product=='Q':
product_list()
exit()
else:
f.write(Product)
f.write('
')
f.close()
product_list()
#定义修改商品价格函数
def edit_product():
while True:
f2 = open(r'E:my python studyfilesproduct_list.txt', 'r+', encoding='utf-8')
with open(r'E:my python studyfilesproduct_list.txt','r+',encoding='utf-8') as f:
print("您的商品列表：")
product_list()
old=input("请输入要修改的商品名称及价格：")
if old == 'q' or old == 'Q':
print(product_list())
exit()
else:
new=input("请输入修改后的商品名称及价格：")
if new == 'q' or new== 'Q':
print(product_list())
exit()
else:
for line in f:
if old in line:
line=line.replace(old,new)
f2.write(line)
print(product_list())
#定义判断是否第一次登录及充值函数
def chk_first_login():
if os.path.exists(r"E:my python studyfilesalance.txt"):
with open(r'E:my python studyfilesalance.txt', 'r', encoding='utf-8') as f:
for Balance in f.readlines():
print('欢迎光临，您目前的余额为：', Balance)
else:
with open(r'E:my python studyfilesalance.txt', 'w+', encoding='utf-8') as f:
print('欢迎光临，第一次使用，请先充值！')
Balance = input('请输入充值金额：')
f.write(Balance)
print('正在充值，请稍候', end='')
for i in range(10):
sys.stdout.write('.')
sys.stdout.flush()
time.sleep(1)
print('
充值成功！祝您购物愉快^_^')
#定义获取价格函数
def get_price(x):
with open(r'E:my python studyfilesproduct_list.txt',encoding='utf-8') as f:
item=[]
price=[]
for i in f.readlines():
item.append(i.split()[0])
price.append(i.split()[1])
s=zip(item,price)
d={}
for k,v in s:
d[k]=v
if x not in d.keys():
print("输入错误，请重新输入！")
buy_main()
else:
return int(d[x])
#定义获取余额函数
def get_balance():
with open(r'E:my python studyfilesalance.txt', 'r', encoding='utf-8') as f:
balance=f.read()
return int(balance)
#定义购物车记录函数
def shopping_record(record):
with open(r'E:my python studyfilesshopping_cart.txt', 'a+', encoding='utf-8') as f:
for i in record:
f.write('%s
'%(i))
#定义获取购物记录函数
def get_shopping_record():
with open(r'E:my python studyfilesshopping_cart.txt', 'r', encoding='utf-8') as f:
print(f.read())
#定义购买函数
def buy_main():
choice=input("输入商品名称购买商品，退出请按q！:")
if choice == 'q' or choice =='Q':
print('我的购物车：',end='')
get_shopping_record()
print("欢迎下次光临，再见！")
exit()
else:
Price = int(get_price(choice))
print("您要购买的商品价格为：%s" %(Price))
Balance=get_balance()
if Price > Balance:
print(" 33[31;1m对不起，您的余额不足！ 33[0m")
else:
print("您购买的%s 已添加至购物车"%(choice))
Balance=str(Balance - Price)
with open(r'E:my python studyfilesalance.txt', 'w+', encoding='utf-8') as f:
f.write(Balance)
Shopping_cart=[]
Shopping_cart.append(choice)
shopping_record(Shopping_cart)
#######################################################################################################################
def fun_customers():
login_name = input("Login：")
login_pass = input("Password：")
login_new.confirm(login_name,login_pass)
chk_first_login()
time.sleep(1)
print("我们有一下商品供您选购：")
product_list()
while True:
buy_main()
def fun_seller():
login_name = input("Login：")
login_pass = input("Password：")
login_new.confirm(login_name, login_pass)
print("您的商品列表：")
product_list()
while True:
print("增加商品输入a，修改商品价格输入)c:")
choice=input(":")
if choice=='a':
add_product()
elif choice=='c':
edit_product()
else:
print("输入错误，请重新输入！")
#####################################################################################################################
print("商家入口输入s")
print("用户入口输入c")
role=input(":")
while True:
if role =='c' or role=='C':
fun_customers()
elif role == 's' or role == 'B':
fun_seller()
elif role == 'q' or role == 'Q':
print("谢谢使用！")
else:
print('输入错误，请重新输入！')
用户名密码判断函数：
#Author by Andy
#_*_ coding:utf-8 _*_
#定义校验用户名及密码函数
def confirm(x,y):
login_name = x
login_pass = y
_username = open(r"E:my python studyfilesusername.txt")
username_list = []
for username in _username.readlines():
username_list.append(username.strip("
"))
_username.close()
_password = open(r"E:my python studyfilespassword.txt")
password_list = []
for passwd in _password.readlines():
password_list.append(passwd.strip("
"))
_password.close()
passwd_dict = {}
s = zip(username_list, password_list)
for k, v in s:
passwd_dict[k] = v
if passwd_dict[login_name] != login_pass:
print ("username or password wrong!")
return 1
else:
# print ("Welcome!")
return 0